src/cli/runCli.js

Summary

Maintainability
B
5 hrs
Test Coverage

Function runCli has a Cognitive Complexity of 24 (exceeds 5 allowed). Consider refactoring.
Open

export default function runCli({
    info = { version: 'Unknown', name: 'Unknown' },
    commands: initialCommands,
    argv = process.argv,
    invoke = true,
Severity: Minor
Found in src/cli/runCli.js - About 3 hrs to fix

Cognitive Complexity

Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

A method's cognitive complexity is based on a few simple rules:

  • Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
  • Code is considered more complex for each "break in the linear flow of the code"
  • Code is considered more complex when "flow breaking structures are nested"

Further reading

Avoid too many return statements within this function.
Open

    return undefined;
Severity: Major
Found in src/cli/runCli.js - About 30 mins to fix

    Avoid too many return statements within this function.
    Open

                    return commandResult
                        .catch((error) => {
                            log.small.warn('A problem occurred when running the command', error);
                        });
    Severity: Major
    Found in src/cli/runCli.js - About 30 mins to fix

      Avoid too many return statements within this function.
      Open

                  return commandResult;
      Severity: Major
      Found in src/cli/runCli.js - About 30 mins to fix

        Avoid too many return statements within this function.
        Open

                return console.log(
                    generateCommandDocumentation(
                        context.extensionConfig.settings,
                        context.meta.settings,
                        commandData.commands,
        Severity: Major
        Found in src/cli/runCli.js - About 30 mins to fix

          Avoid too many return statements within this function.
          Open

                      return execute(command.command, {
                          context: command.__context,
                          args: input.extraArguments,
                          cwd: dirPath,
                      }).catch((error) => {
          Severity: Major
          Found in src/cli/runCli.js - About 30 mins to fix

            Missing trailing comma.
            Open

                    info.name
            Severity: Minor
            Found in src/cli/runCli.js by eslint

            require or disallow trailing commas (comma-dangle)

            Trailing commas in object literals are valid according to the ECMAScript 5 (and ECMAScript 3!) spec. However, IE8 (when not in IE8 document mode) and below will throw an error when it encounters trailing commas in JavaScript.

            var foo = {
                bar: "baz",
                qux: "quux",
            };

            Trailing commas simplify adding and removing items to objects and arrays, since only the lines you are modifying must be touched. Another argument in favor of trailing commas is that it improves the clarity of diffs when an item is added or removed from an object or array:

            Less clear:

            var foo = {
            -    bar: "baz",
            -    qux: "quux"
            +    bar: "baz"
             };

            More clear:

            var foo = {
                 bar: "baz",
            -    qux: "quux",
             };

            Rule Details

            This rule enforces consistent use of trailing commas in object and array literals.

            Options

            This rule has a string option or an object option:

            {
                "comma-dangle": ["error", "never"],
                // or
                "comma-dangle": ["error", {
                    "arrays": "never",
                    "objects": "never",
                    "imports": "never",
                    "exports": "never",
                    "functions": "ignore",
                }]
            }
            • "never" (default) disallows trailing commas
            • "always" requires trailing commas
            • "always-multiline" requires trailing commas when the last element or property is in a different line than the closing ] or } and disallows trailing commas when the last element or property is on the same line as the closing ] or }
            • "only-multiline" allows (but does not require) trailing commas when the last element or property is in a different line than the closing ] or } and disallows trailing commas when the last element or property is on the same line as the closing ] or }

            Trailing commas in function declarations and function calls are valid syntax since ECMAScript 2017; however, the string option does not check these situations for backwards compatibility.

            You can also use an object option to configure this rule for each type of syntax. Each of the following options can be set to "never", "always", "always-multiline", "only-multiline", or "ignore". The default for each option is "never" unless otherwise specified.

            • arrays is for array literals and array patterns of destructuring. (e.g. let [a,] = [1,];)
            • objects is for object literals and object patterns of destructuring. (e.g. let {a,} = {a: 1};)
            • imports is for import declarations of ES Modules. (e.g. import {a,} from "foo";)
            • exports is for export declarations of ES Modules. (e.g. export {a,};)
            • functions is for function declarations and function calls. (e.g. (function(a,){ })(b,);)
              functions is set to "ignore" by default for consistency with the string option.

            never

            Examples of incorrect code for this rule with the default "never" option:

            /*eslint comma-dangle: ["error", "never"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var arr = [1,2,];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            Examples of correct code for this rule with the default "never" option:

            /*eslint comma-dangle: ["error", "never"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var arr = [1,2];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            always

            Examples of incorrect code for this rule with the "always" option:

            /*eslint comma-dangle: ["error", "always"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var arr = [1,2];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            Examples of correct code for this rule with the "always" option:

            /*eslint comma-dangle: ["error", "always"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var arr = [1,2,];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            always-multiline

            Examples of incorrect code for this rule with the "always-multiline" option:

            /*eslint comma-dangle: ["error", "always-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var foo = { bar: "baz", qux: "quux", };
            
            var arr = [1,2,];
            
            var arr = [1,
                2,];
            
            var arr = [
                1,
                2
            ];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            Examples of correct code for this rule with the "always-multiline" option:

            /*eslint comma-dangle: ["error", "always-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var foo = {bar: "baz", qux: "quux"};
            var arr = [1,2];
            
            var arr = [1,
                2];
            
            var arr = [
                1,
                2,
            ];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            only-multiline

            Examples of incorrect code for this rule with the "only-multiline" option:

            /*eslint comma-dangle: ["error", "only-multiline"]*/
            
            var foo = { bar: "baz", qux: "quux", };
            
            var arr = [1,2,];
            
            var arr = [1,
                2,];

            Examples of correct code for this rule with the "only-multiline" option:

            /*eslint comma-dangle: ["error", "only-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var foo = {bar: "baz", qux: "quux"};
            var arr = [1,2];
            
            var arr = [1,
                2];
            
            var arr = [
                1,
                2,
            ];
            
            var arr = [
                1,
                2
            ];
            
            foo({
              bar: "baz",
              qux: "quux",
            });
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            functions

            Examples of incorrect code for this rule with the {"functions": "never"} option:

            /*eslint comma-dangle: ["error", {"functions": "never"}]*/
            
            function foo(a, b,) {
            }
            
            foo(a, b,);
            new foo(a, b,);

            Examples of correct code for this rule with the {"functions": "never"} option:

            /*eslint comma-dangle: ["error", {"functions": "never"}]*/
            
            function foo(a, b) {
            }
            
            foo(a, b);
            new foo(a, b);

            Examples of incorrect code for this rule with the {"functions": "always"} option:

            /*eslint comma-dangle: ["error", {"functions": "always"}]*/
            
            function foo(a, b) {
            }
            
            foo(a, b);
            new foo(a, b);

            Examples of correct code for this rule with the {"functions": "always"} option:

            /*eslint comma-dangle: ["error", {"functions": "always"}]*/
            
            function foo(a, b,) {
            }
            
            foo(a, b,);
            new foo(a, b,);

            When Not To Use It

            You can turn this rule off if you are not concerned with dangling commas. Source: http://eslint.org/docs/rules/

            Missing trailing comma.
            Open

                        commandData.parents
            Severity: Minor
            Found in src/cli/runCli.js by eslint

            require or disallow trailing commas (comma-dangle)

            Trailing commas in object literals are valid according to the ECMAScript 5 (and ECMAScript 3!) spec. However, IE8 (when not in IE8 document mode) and below will throw an error when it encounters trailing commas in JavaScript.

            var foo = {
                bar: "baz",
                qux: "quux",
            };

            Trailing commas simplify adding and removing items to objects and arrays, since only the lines you are modifying must be touched. Another argument in favor of trailing commas is that it improves the clarity of diffs when an item is added or removed from an object or array:

            Less clear:

            var foo = {
            -    bar: "baz",
            -    qux: "quux"
            +    bar: "baz"
             };

            More clear:

            var foo = {
                 bar: "baz",
            -    qux: "quux",
             };

            Rule Details

            This rule enforces consistent use of trailing commas in object and array literals.

            Options

            This rule has a string option or an object option:

            {
                "comma-dangle": ["error", "never"],
                // or
                "comma-dangle": ["error", {
                    "arrays": "never",
                    "objects": "never",
                    "imports": "never",
                    "exports": "never",
                    "functions": "ignore",
                }]
            }
            • "never" (default) disallows trailing commas
            • "always" requires trailing commas
            • "always-multiline" requires trailing commas when the last element or property is in a different line than the closing ] or } and disallows trailing commas when the last element or property is on the same line as the closing ] or }
            • "only-multiline" allows (but does not require) trailing commas when the last element or property is in a different line than the closing ] or } and disallows trailing commas when the last element or property is on the same line as the closing ] or }

            Trailing commas in function declarations and function calls are valid syntax since ECMAScript 2017; however, the string option does not check these situations for backwards compatibility.

            You can also use an object option to configure this rule for each type of syntax. Each of the following options can be set to "never", "always", "always-multiline", "only-multiline", or "ignore". The default for each option is "never" unless otherwise specified.

            • arrays is for array literals and array patterns of destructuring. (e.g. let [a,] = [1,];)
            • objects is for object literals and object patterns of destructuring. (e.g. let {a,} = {a: 1};)
            • imports is for import declarations of ES Modules. (e.g. import {a,} from "foo";)
            • exports is for export declarations of ES Modules. (e.g. export {a,};)
            • functions is for function declarations and function calls. (e.g. (function(a,){ })(b,);)
              functions is set to "ignore" by default for consistency with the string option.

            never

            Examples of incorrect code for this rule with the default "never" option:

            /*eslint comma-dangle: ["error", "never"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var arr = [1,2,];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            Examples of correct code for this rule with the default "never" option:

            /*eslint comma-dangle: ["error", "never"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var arr = [1,2];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            always

            Examples of incorrect code for this rule with the "always" option:

            /*eslint comma-dangle: ["error", "always"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var arr = [1,2];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            Examples of correct code for this rule with the "always" option:

            /*eslint comma-dangle: ["error", "always"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var arr = [1,2,];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            always-multiline

            Examples of incorrect code for this rule with the "always-multiline" option:

            /*eslint comma-dangle: ["error", "always-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var foo = { bar: "baz", qux: "quux", };
            
            var arr = [1,2,];
            
            var arr = [1,
                2,];
            
            var arr = [
                1,
                2
            ];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            Examples of correct code for this rule with the "always-multiline" option:

            /*eslint comma-dangle: ["error", "always-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var foo = {bar: "baz", qux: "quux"};
            var arr = [1,2];
            
            var arr = [1,
                2];
            
            var arr = [
                1,
                2,
            ];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            only-multiline

            Examples of incorrect code for this rule with the "only-multiline" option:

            /*eslint comma-dangle: ["error", "only-multiline"]*/
            
            var foo = { bar: "baz", qux: "quux", };
            
            var arr = [1,2,];
            
            var arr = [1,
                2,];

            Examples of correct code for this rule with the "only-multiline" option:

            /*eslint comma-dangle: ["error", "only-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var foo = {bar: "baz", qux: "quux"};
            var arr = [1,2];
            
            var arr = [1,
                2];
            
            var arr = [
                1,
                2,
            ];
            
            var arr = [
                1,
                2
            ];
            
            foo({
              bar: "baz",
              qux: "quux",
            });
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            functions

            Examples of incorrect code for this rule with the {"functions": "never"} option:

            /*eslint comma-dangle: ["error", {"functions": "never"}]*/
            
            function foo(a, b,) {
            }
            
            foo(a, b,);
            new foo(a, b,);

            Examples of correct code for this rule with the {"functions": "never"} option:

            /*eslint comma-dangle: ["error", {"functions": "never"}]*/
            
            function foo(a, b) {
            }
            
            foo(a, b);
            new foo(a, b);

            Examples of incorrect code for this rule with the {"functions": "always"} option:

            /*eslint comma-dangle: ["error", {"functions": "always"}]*/
            
            function foo(a, b) {
            }
            
            foo(a, b);
            new foo(a, b);

            Examples of correct code for this rule with the {"functions": "always"} option:

            /*eslint comma-dangle: ["error", {"functions": "always"}]*/
            
            function foo(a, b,) {
            }
            
            foo(a, b,);
            new foo(a, b,);

            When Not To Use It

            You can turn this rule off if you are not concerned with dangling commas. Source: http://eslint.org/docs/rules/

            Missing trailing comma.
            Open

                            commandData.parents
            Severity: Minor
            Found in src/cli/runCli.js by eslint

            require or disallow trailing commas (comma-dangle)

            Trailing commas in object literals are valid according to the ECMAScript 5 (and ECMAScript 3!) spec. However, IE8 (when not in IE8 document mode) and below will throw an error when it encounters trailing commas in JavaScript.

            var foo = {
                bar: "baz",
                qux: "quux",
            };

            Trailing commas simplify adding and removing items to objects and arrays, since only the lines you are modifying must be touched. Another argument in favor of trailing commas is that it improves the clarity of diffs when an item is added or removed from an object or array:

            Less clear:

            var foo = {
            -    bar: "baz",
            -    qux: "quux"
            +    bar: "baz"
             };

            More clear:

            var foo = {
                 bar: "baz",
            -    qux: "quux",
             };

            Rule Details

            This rule enforces consistent use of trailing commas in object and array literals.

            Options

            This rule has a string option or an object option:

            {
                "comma-dangle": ["error", "never"],
                // or
                "comma-dangle": ["error", {
                    "arrays": "never",
                    "objects": "never",
                    "imports": "never",
                    "exports": "never",
                    "functions": "ignore",
                }]
            }
            • "never" (default) disallows trailing commas
            • "always" requires trailing commas
            • "always-multiline" requires trailing commas when the last element or property is in a different line than the closing ] or } and disallows trailing commas when the last element or property is on the same line as the closing ] or }
            • "only-multiline" allows (but does not require) trailing commas when the last element or property is in a different line than the closing ] or } and disallows trailing commas when the last element or property is on the same line as the closing ] or }

            Trailing commas in function declarations and function calls are valid syntax since ECMAScript 2017; however, the string option does not check these situations for backwards compatibility.

            You can also use an object option to configure this rule for each type of syntax. Each of the following options can be set to "never", "always", "always-multiline", "only-multiline", or "ignore". The default for each option is "never" unless otherwise specified.

            • arrays is for array literals and array patterns of destructuring. (e.g. let [a,] = [1,];)
            • objects is for object literals and object patterns of destructuring. (e.g. let {a,} = {a: 1};)
            • imports is for import declarations of ES Modules. (e.g. import {a,} from "foo";)
            • exports is for export declarations of ES Modules. (e.g. export {a,};)
            • functions is for function declarations and function calls. (e.g. (function(a,){ })(b,);)
              functions is set to "ignore" by default for consistency with the string option.

            never

            Examples of incorrect code for this rule with the default "never" option:

            /*eslint comma-dangle: ["error", "never"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var arr = [1,2,];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            Examples of correct code for this rule with the default "never" option:

            /*eslint comma-dangle: ["error", "never"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var arr = [1,2];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            always

            Examples of incorrect code for this rule with the "always" option:

            /*eslint comma-dangle: ["error", "always"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var arr = [1,2];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            Examples of correct code for this rule with the "always" option:

            /*eslint comma-dangle: ["error", "always"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var arr = [1,2,];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            always-multiline

            Examples of incorrect code for this rule with the "always-multiline" option:

            /*eslint comma-dangle: ["error", "always-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var foo = { bar: "baz", qux: "quux", };
            
            var arr = [1,2,];
            
            var arr = [1,
                2,];
            
            var arr = [
                1,
                2
            ];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            Examples of correct code for this rule with the "always-multiline" option:

            /*eslint comma-dangle: ["error", "always-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var foo = {bar: "baz", qux: "quux"};
            var arr = [1,2];
            
            var arr = [1,
                2];
            
            var arr = [
                1,
                2,
            ];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            only-multiline

            Examples of incorrect code for this rule with the "only-multiline" option:

            /*eslint comma-dangle: ["error", "only-multiline"]*/
            
            var foo = { bar: "baz", qux: "quux", };
            
            var arr = [1,2,];
            
            var arr = [1,
                2,];

            Examples of correct code for this rule with the "only-multiline" option:

            /*eslint comma-dangle: ["error", "only-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var foo = {bar: "baz", qux: "quux"};
            var arr = [1,2];
            
            var arr = [1,
                2];
            
            var arr = [
                1,
                2,
            ];
            
            var arr = [
                1,
                2
            ];
            
            foo({
              bar: "baz",
              qux: "quux",
            });
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            functions

            Examples of incorrect code for this rule with the {"functions": "never"} option:

            /*eslint comma-dangle: ["error", {"functions": "never"}]*/
            
            function foo(a, b,) {
            }
            
            foo(a, b,);
            new foo(a, b,);

            Examples of correct code for this rule with the {"functions": "never"} option:

            /*eslint comma-dangle: ["error", {"functions": "never"}]*/
            
            function foo(a, b) {
            }
            
            foo(a, b);
            new foo(a, b);

            Examples of incorrect code for this rule with the {"functions": "always"} option:

            /*eslint comma-dangle: ["error", {"functions": "always"}]*/
            
            function foo(a, b) {
            }
            
            foo(a, b);
            new foo(a, b);

            Examples of correct code for this rule with the {"functions": "always"} option:

            /*eslint comma-dangle: ["error", {"functions": "always"}]*/
            
            function foo(a, b,) {
            }
            
            foo(a, b,);
            new foo(a, b,);

            When Not To Use It

            You can turn this rule off if you are not concerned with dangling commas. Source: http://eslint.org/docs/rules/

            Unexpected console statement.
            Open

                    return console.log(
            Severity: Minor
            Found in src/cli/runCli.js by eslint

            disallow the use of console (no-console)

            In JavaScript that is designed to be executed in the browser, it's considered a best practice to avoid using methods on console. Such messages are considered to be for debugging purposes and therefore not suitable to ship to the client. In general, calls using console should be stripped before being pushed to production.

            console.log("Made it here.");
            console.error("That shouldn't have happened.");

            Rule Details

            This rule disallows calls to methods of the console object.

            Examples of incorrect code for this rule:

            /*eslint no-console: "error"*/
            
            console.log("Log a debug level message.");
            console.warn("Log a warn level message.");
            console.error("Log an error level message.");

            Examples of correct code for this rule:

            /*eslint no-console: "error"*/
            
            // custom console
            Console.log("Hello world!");

            Options

            This rule has an object option for exceptions:

            • "allow" has an array of strings which are allowed methods of the console object

            Examples of additional correct code for this rule with a sample { "allow": ["warn", "error"] } option:

            /*eslint no-console: ["error", { allow: ["warn", "error"] }] */
            
            console.warn("Log a warn level message.");
            console.error("Log an error level message.");

            When Not To Use It

            If you're using Node.js, however, console is used to output information to the user and so is not strictly used for debugging purposes. If you are developing for Node.js then you most likely do not want this rule enabled.

            Related Rules

            Missing trailing comma.
            Open

                        )
            Severity: Minor
            Found in src/cli/runCli.js by eslint

            require or disallow trailing commas (comma-dangle)

            Trailing commas in object literals are valid according to the ECMAScript 5 (and ECMAScript 3!) spec. However, IE8 (when not in IE8 document mode) and below will throw an error when it encounters trailing commas in JavaScript.

            var foo = {
                bar: "baz",
                qux: "quux",
            };

            Trailing commas simplify adding and removing items to objects and arrays, since only the lines you are modifying must be touched. Another argument in favor of trailing commas is that it improves the clarity of diffs when an item is added or removed from an object or array:

            Less clear:

            var foo = {
            -    bar: "baz",
            -    qux: "quux"
            +    bar: "baz"
             };

            More clear:

            var foo = {
                 bar: "baz",
            -    qux: "quux",
             };

            Rule Details

            This rule enforces consistent use of trailing commas in object and array literals.

            Options

            This rule has a string option or an object option:

            {
                "comma-dangle": ["error", "never"],
                // or
                "comma-dangle": ["error", {
                    "arrays": "never",
                    "objects": "never",
                    "imports": "never",
                    "exports": "never",
                    "functions": "ignore",
                }]
            }
            • "never" (default) disallows trailing commas
            • "always" requires trailing commas
            • "always-multiline" requires trailing commas when the last element or property is in a different line than the closing ] or } and disallows trailing commas when the last element or property is on the same line as the closing ] or }
            • "only-multiline" allows (but does not require) trailing commas when the last element or property is in a different line than the closing ] or } and disallows trailing commas when the last element or property is on the same line as the closing ] or }

            Trailing commas in function declarations and function calls are valid syntax since ECMAScript 2017; however, the string option does not check these situations for backwards compatibility.

            You can also use an object option to configure this rule for each type of syntax. Each of the following options can be set to "never", "always", "always-multiline", "only-multiline", or "ignore". The default for each option is "never" unless otherwise specified.

            • arrays is for array literals and array patterns of destructuring. (e.g. let [a,] = [1,];)
            • objects is for object literals and object patterns of destructuring. (e.g. let {a,} = {a: 1};)
            • imports is for import declarations of ES Modules. (e.g. import {a,} from "foo";)
            • exports is for export declarations of ES Modules. (e.g. export {a,};)
            • functions is for function declarations and function calls. (e.g. (function(a,){ })(b,);)
              functions is set to "ignore" by default for consistency with the string option.

            never

            Examples of incorrect code for this rule with the default "never" option:

            /*eslint comma-dangle: ["error", "never"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var arr = [1,2,];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            Examples of correct code for this rule with the default "never" option:

            /*eslint comma-dangle: ["error", "never"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var arr = [1,2];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            always

            Examples of incorrect code for this rule with the "always" option:

            /*eslint comma-dangle: ["error", "always"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var arr = [1,2];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            Examples of correct code for this rule with the "always" option:

            /*eslint comma-dangle: ["error", "always"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var arr = [1,2,];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            always-multiline

            Examples of incorrect code for this rule with the "always-multiline" option:

            /*eslint comma-dangle: ["error", "always-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var foo = { bar: "baz", qux: "quux", };
            
            var arr = [1,2,];
            
            var arr = [1,
                2,];
            
            var arr = [
                1,
                2
            ];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            Examples of correct code for this rule with the "always-multiline" option:

            /*eslint comma-dangle: ["error", "always-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var foo = {bar: "baz", qux: "quux"};
            var arr = [1,2];
            
            var arr = [1,
                2];
            
            var arr = [
                1,
                2,
            ];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            only-multiline

            Examples of incorrect code for this rule with the "only-multiline" option:

            /*eslint comma-dangle: ["error", "only-multiline"]*/
            
            var foo = { bar: "baz", qux: "quux", };
            
            var arr = [1,2,];
            
            var arr = [1,
                2,];

            Examples of correct code for this rule with the "only-multiline" option:

            /*eslint comma-dangle: ["error", "only-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var foo = {bar: "baz", qux: "quux"};
            var arr = [1,2];
            
            var arr = [1,
                2];
            
            var arr = [
                1,
                2,
            ];
            
            var arr = [
                1,
                2
            ];
            
            foo({
              bar: "baz",
              qux: "quux",
            });
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            functions

            Examples of incorrect code for this rule with the {"functions": "never"} option:

            /*eslint comma-dangle: ["error", {"functions": "never"}]*/
            
            function foo(a, b,) {
            }
            
            foo(a, b,);
            new foo(a, b,);

            Examples of correct code for this rule with the {"functions": "never"} option:

            /*eslint comma-dangle: ["error", {"functions": "never"}]*/
            
            function foo(a, b) {
            }
            
            foo(a, b);
            new foo(a, b);

            Examples of incorrect code for this rule with the {"functions": "always"} option:

            /*eslint comma-dangle: ["error", {"functions": "always"}]*/
            
            function foo(a, b) {
            }
            
            foo(a, b);
            new foo(a, b);

            Examples of correct code for this rule with the {"functions": "always"} option:

            /*eslint comma-dangle: ["error", {"functions": "always"}]*/
            
            function foo(a, b,) {
            }
            
            foo(a, b,);
            new foo(a, b,);

            When Not To Use It

            You can turn this rule off if you are not concerned with dangling commas. Source: http://eslint.org/docs/rules/

            Unexpected console statement.
            Open

                    return console.log(info.version);
            Severity: Minor
            Found in src/cli/runCli.js by eslint

            disallow the use of console (no-console)

            In JavaScript that is designed to be executed in the browser, it's considered a best practice to avoid using methods on console. Such messages are considered to be for debugging purposes and therefore not suitable to ship to the client. In general, calls using console should be stripped before being pushed to production.

            console.log("Made it here.");
            console.error("That shouldn't have happened.");

            Rule Details

            This rule disallows calls to methods of the console object.

            Examples of incorrect code for this rule:

            /*eslint no-console: "error"*/
            
            console.log("Log a debug level message.");
            console.warn("Log a warn level message.");
            console.error("Log an error level message.");

            Examples of correct code for this rule:

            /*eslint no-console: "error"*/
            
            // custom console
            Console.log("Hello world!");

            Options

            This rule has an object option for exceptions:

            • "allow" has an array of strings which are allowed methods of the console object

            Examples of additional correct code for this rule with a sample { "allow": ["warn", "error"] } option:

            /*eslint no-console: ["error", { allow: ["warn", "error"] }] */
            
            console.warn("Log a warn level message.");
            console.error("Log an error level message.");

            When Not To Use It

            If you're using Node.js, however, console is used to output information to the user and so is not strictly used for debugging purposes. If you are developing for Node.js then you most likely do not want this rule enabled.

            Related Rules

            Unexpected console statement.
            Open

                    return console.log(
            Severity: Minor
            Found in src/cli/runCli.js by eslint

            disallow the use of console (no-console)

            In JavaScript that is designed to be executed in the browser, it's considered a best practice to avoid using methods on console. Such messages are considered to be for debugging purposes and therefore not suitable to ship to the client. In general, calls using console should be stripped before being pushed to production.

            console.log("Made it here.");
            console.error("That shouldn't have happened.");

            Rule Details

            This rule disallows calls to methods of the console object.

            Examples of incorrect code for this rule:

            /*eslint no-console: "error"*/
            
            console.log("Log a debug level message.");
            console.warn("Log a warn level message.");
            console.error("Log an error level message.");

            Examples of correct code for this rule:

            /*eslint no-console: "error"*/
            
            // custom console
            Console.log("Hello world!");

            Options

            This rule has an object option for exceptions:

            • "allow" has an array of strings which are allowed methods of the console object

            Examples of additional correct code for this rule with a sample { "allow": ["warn", "error"] } option:

            /*eslint no-console: ["error", { allow: ["warn", "error"] }] */
            
            console.warn("Log a warn level message.");
            console.error("Log an error level message.");

            When Not To Use It

            If you're using Node.js, however, console is used to output information to the user and so is not strictly used for debugging purposes. If you are developing for Node.js then you most likely do not want this rule enabled.

            Related Rules

            Missing trailing comma.
            Open

                        generateCommandsDocumentation(context.commands, info.name)
            Severity: Minor
            Found in src/cli/runCli.js by eslint

            require or disallow trailing commas (comma-dangle)

            Trailing commas in object literals are valid according to the ECMAScript 5 (and ECMAScript 3!) spec. However, IE8 (when not in IE8 document mode) and below will throw an error when it encounters trailing commas in JavaScript.

            var foo = {
                bar: "baz",
                qux: "quux",
            };

            Trailing commas simplify adding and removing items to objects and arrays, since only the lines you are modifying must be touched. Another argument in favor of trailing commas is that it improves the clarity of diffs when an item is added or removed from an object or array:

            Less clear:

            var foo = {
            -    bar: "baz",
            -    qux: "quux"
            +    bar: "baz"
             };

            More clear:

            var foo = {
                 bar: "baz",
            -    qux: "quux",
             };

            Rule Details

            This rule enforces consistent use of trailing commas in object and array literals.

            Options

            This rule has a string option or an object option:

            {
                "comma-dangle": ["error", "never"],
                // or
                "comma-dangle": ["error", {
                    "arrays": "never",
                    "objects": "never",
                    "imports": "never",
                    "exports": "never",
                    "functions": "ignore",
                }]
            }
            • "never" (default) disallows trailing commas
            • "always" requires trailing commas
            • "always-multiline" requires trailing commas when the last element or property is in a different line than the closing ] or } and disallows trailing commas when the last element or property is on the same line as the closing ] or }
            • "only-multiline" allows (but does not require) trailing commas when the last element or property is in a different line than the closing ] or } and disallows trailing commas when the last element or property is on the same line as the closing ] or }

            Trailing commas in function declarations and function calls are valid syntax since ECMAScript 2017; however, the string option does not check these situations for backwards compatibility.

            You can also use an object option to configure this rule for each type of syntax. Each of the following options can be set to "never", "always", "always-multiline", "only-multiline", or "ignore". The default for each option is "never" unless otherwise specified.

            • arrays is for array literals and array patterns of destructuring. (e.g. let [a,] = [1,];)
            • objects is for object literals and object patterns of destructuring. (e.g. let {a,} = {a: 1};)
            • imports is for import declarations of ES Modules. (e.g. import {a,} from "foo";)
            • exports is for export declarations of ES Modules. (e.g. export {a,};)
            • functions is for function declarations and function calls. (e.g. (function(a,){ })(b,);)
              functions is set to "ignore" by default for consistency with the string option.

            never

            Examples of incorrect code for this rule with the default "never" option:

            /*eslint comma-dangle: ["error", "never"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var arr = [1,2,];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            Examples of correct code for this rule with the default "never" option:

            /*eslint comma-dangle: ["error", "never"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var arr = [1,2];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            always

            Examples of incorrect code for this rule with the "always" option:

            /*eslint comma-dangle: ["error", "always"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var arr = [1,2];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            Examples of correct code for this rule with the "always" option:

            /*eslint comma-dangle: ["error", "always"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var arr = [1,2,];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            always-multiline

            Examples of incorrect code for this rule with the "always-multiline" option:

            /*eslint comma-dangle: ["error", "always-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var foo = { bar: "baz", qux: "quux", };
            
            var arr = [1,2,];
            
            var arr = [1,
                2,];
            
            var arr = [
                1,
                2
            ];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            Examples of correct code for this rule with the "always-multiline" option:

            /*eslint comma-dangle: ["error", "always-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var foo = {bar: "baz", qux: "quux"};
            var arr = [1,2];
            
            var arr = [1,
                2];
            
            var arr = [
                1,
                2,
            ];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            only-multiline

            Examples of incorrect code for this rule with the "only-multiline" option:

            /*eslint comma-dangle: ["error", "only-multiline"]*/
            
            var foo = { bar: "baz", qux: "quux", };
            
            var arr = [1,2,];
            
            var arr = [1,
                2,];

            Examples of correct code for this rule with the "only-multiline" option:

            /*eslint comma-dangle: ["error", "only-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var foo = {bar: "baz", qux: "quux"};
            var arr = [1,2];
            
            var arr = [1,
                2];
            
            var arr = [
                1,
                2,
            ];
            
            var arr = [
                1,
                2
            ];
            
            foo({
              bar: "baz",
              qux: "quux",
            });
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            functions

            Examples of incorrect code for this rule with the {"functions": "never"} option:

            /*eslint comma-dangle: ["error", {"functions": "never"}]*/
            
            function foo(a, b,) {
            }
            
            foo(a, b,);
            new foo(a, b,);

            Examples of correct code for this rule with the {"functions": "never"} option:

            /*eslint comma-dangle: ["error", {"functions": "never"}]*/
            
            function foo(a, b) {
            }
            
            foo(a, b);
            new foo(a, b);

            Examples of incorrect code for this rule with the {"functions": "always"} option:

            /*eslint comma-dangle: ["error", {"functions": "always"}]*/
            
            function foo(a, b) {
            }
            
            foo(a, b);
            new foo(a, b);

            Examples of correct code for this rule with the {"functions": "always"} option:

            /*eslint comma-dangle: ["error", {"functions": "always"}]*/
            
            function foo(a, b,) {
            }
            
            foo(a, b,);
            new foo(a, b,);

            When Not To Use It

            You can turn this rule off if you are not concerned with dangling commas. Source: http://eslint.org/docs/rules/

            Unexpected console statement.
            Open

                    return console.log(commandData);
            Severity: Minor
            Found in src/cli/runCli.js by eslint

            disallow the use of console (no-console)

            In JavaScript that is designed to be executed in the browser, it's considered a best practice to avoid using methods on console. Such messages are considered to be for debugging purposes and therefore not suitable to ship to the client. In general, calls using console should be stripped before being pushed to production.

            console.log("Made it here.");
            console.error("That shouldn't have happened.");

            Rule Details

            This rule disallows calls to methods of the console object.

            Examples of incorrect code for this rule:

            /*eslint no-console: "error"*/
            
            console.log("Log a debug level message.");
            console.warn("Log a warn level message.");
            console.error("Log an error level message.");

            Examples of correct code for this rule:

            /*eslint no-console: "error"*/
            
            // custom console
            Console.log("Hello world!");

            Options

            This rule has an object option for exceptions:

            • "allow" has an array of strings which are allowed methods of the console object

            Examples of additional correct code for this rule with a sample { "allow": ["warn", "error"] } option:

            /*eslint no-console: ["error", { allow: ["warn", "error"] }] */
            
            console.warn("Log a warn level message.");
            console.error("Log an error level message.");

            When Not To Use It

            If you're using Node.js, however, console is used to output information to the user and so is not strictly used for debugging purposes. If you are developing for Node.js then you most likely do not want this rule enabled.

            Related Rules

            Missing trailing comma.
            Open

                        'Invalid command'
            Severity: Minor
            Found in src/cli/runCli.js by eslint

            require or disallow trailing commas (comma-dangle)

            Trailing commas in object literals are valid according to the ECMAScript 5 (and ECMAScript 3!) spec. However, IE8 (when not in IE8 document mode) and below will throw an error when it encounters trailing commas in JavaScript.

            var foo = {
                bar: "baz",
                qux: "quux",
            };

            Trailing commas simplify adding and removing items to objects and arrays, since only the lines you are modifying must be touched. Another argument in favor of trailing commas is that it improves the clarity of diffs when an item is added or removed from an object or array:

            Less clear:

            var foo = {
            -    bar: "baz",
            -    qux: "quux"
            +    bar: "baz"
             };

            More clear:

            var foo = {
                 bar: "baz",
            -    qux: "quux",
             };

            Rule Details

            This rule enforces consistent use of trailing commas in object and array literals.

            Options

            This rule has a string option or an object option:

            {
                "comma-dangle": ["error", "never"],
                // or
                "comma-dangle": ["error", {
                    "arrays": "never",
                    "objects": "never",
                    "imports": "never",
                    "exports": "never",
                    "functions": "ignore",
                }]
            }
            • "never" (default) disallows trailing commas
            • "always" requires trailing commas
            • "always-multiline" requires trailing commas when the last element or property is in a different line than the closing ] or } and disallows trailing commas when the last element or property is on the same line as the closing ] or }
            • "only-multiline" allows (but does not require) trailing commas when the last element or property is in a different line than the closing ] or } and disallows trailing commas when the last element or property is on the same line as the closing ] or }

            Trailing commas in function declarations and function calls are valid syntax since ECMAScript 2017; however, the string option does not check these situations for backwards compatibility.

            You can also use an object option to configure this rule for each type of syntax. Each of the following options can be set to "never", "always", "always-multiline", "only-multiline", or "ignore". The default for each option is "never" unless otherwise specified.

            • arrays is for array literals and array patterns of destructuring. (e.g. let [a,] = [1,];)
            • objects is for object literals and object patterns of destructuring. (e.g. let {a,} = {a: 1};)
            • imports is for import declarations of ES Modules. (e.g. import {a,} from "foo";)
            • exports is for export declarations of ES Modules. (e.g. export {a,};)
            • functions is for function declarations and function calls. (e.g. (function(a,){ })(b,);)
              functions is set to "ignore" by default for consistency with the string option.

            never

            Examples of incorrect code for this rule with the default "never" option:

            /*eslint comma-dangle: ["error", "never"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var arr = [1,2,];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            Examples of correct code for this rule with the default "never" option:

            /*eslint comma-dangle: ["error", "never"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var arr = [1,2];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            always

            Examples of incorrect code for this rule with the "always" option:

            /*eslint comma-dangle: ["error", "always"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var arr = [1,2];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            Examples of correct code for this rule with the "always" option:

            /*eslint comma-dangle: ["error", "always"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var arr = [1,2,];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            always-multiline

            Examples of incorrect code for this rule with the "always-multiline" option:

            /*eslint comma-dangle: ["error", "always-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var foo = { bar: "baz", qux: "quux", };
            
            var arr = [1,2,];
            
            var arr = [1,
                2,];
            
            var arr = [
                1,
                2
            ];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            Examples of correct code for this rule with the "always-multiline" option:

            /*eslint comma-dangle: ["error", "always-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var foo = {bar: "baz", qux: "quux"};
            var arr = [1,2];
            
            var arr = [1,
                2];
            
            var arr = [
                1,
                2,
            ];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            only-multiline

            Examples of incorrect code for this rule with the "only-multiline" option:

            /*eslint comma-dangle: ["error", "only-multiline"]*/
            
            var foo = { bar: "baz", qux: "quux", };
            
            var arr = [1,2,];
            
            var arr = [1,
                2,];

            Examples of correct code for this rule with the "only-multiline" option:

            /*eslint comma-dangle: ["error", "only-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var foo = {bar: "baz", qux: "quux"};
            var arr = [1,2];
            
            var arr = [1,
                2];
            
            var arr = [
                1,
                2,
            ];
            
            var arr = [
                1,
                2
            ];
            
            foo({
              bar: "baz",
              qux: "quux",
            });
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            functions

            Examples of incorrect code for this rule with the {"functions": "never"} option:

            /*eslint comma-dangle: ["error", {"functions": "never"}]*/
            
            function foo(a, b,) {
            }
            
            foo(a, b,);
            new foo(a, b,);

            Examples of correct code for this rule with the {"functions": "never"} option:

            /*eslint comma-dangle: ["error", {"functions": "never"}]*/
            
            function foo(a, b) {
            }
            
            foo(a, b);
            new foo(a, b);

            Examples of incorrect code for this rule with the {"functions": "always"} option:

            /*eslint comma-dangle: ["error", {"functions": "always"}]*/
            
            function foo(a, b) {
            }
            
            foo(a, b);
            new foo(a, b);

            Examples of correct code for this rule with the {"functions": "always"} option:

            /*eslint comma-dangle: ["error", {"functions": "always"}]*/
            
            function foo(a, b,) {
            }
            
            foo(a, b,);
            new foo(a, b,);

            When Not To Use It

            You can turn this rule off if you are not concerned with dangling commas. Source: http://eslint.org/docs/rules/

            Missing trailing comma.
            Open

                    (newSettings) => appendSettings(newSettings)
            Severity: Minor
            Found in src/cli/runCli.js by eslint

            require or disallow trailing commas (comma-dangle)

            Trailing commas in object literals are valid according to the ECMAScript 5 (and ECMAScript 3!) spec. However, IE8 (when not in IE8 document mode) and below will throw an error when it encounters trailing commas in JavaScript.

            var foo = {
                bar: "baz",
                qux: "quux",
            };

            Trailing commas simplify adding and removing items to objects and arrays, since only the lines you are modifying must be touched. Another argument in favor of trailing commas is that it improves the clarity of diffs when an item is added or removed from an object or array:

            Less clear:

            var foo = {
            -    bar: "baz",
            -    qux: "quux"
            +    bar: "baz"
             };

            More clear:

            var foo = {
                 bar: "baz",
            -    qux: "quux",
             };

            Rule Details

            This rule enforces consistent use of trailing commas in object and array literals.

            Options

            This rule has a string option or an object option:

            {
                "comma-dangle": ["error", "never"],
                // or
                "comma-dangle": ["error", {
                    "arrays": "never",
                    "objects": "never",
                    "imports": "never",
                    "exports": "never",
                    "functions": "ignore",
                }]
            }
            • "never" (default) disallows trailing commas
            • "always" requires trailing commas
            • "always-multiline" requires trailing commas when the last element or property is in a different line than the closing ] or } and disallows trailing commas when the last element or property is on the same line as the closing ] or }
            • "only-multiline" allows (but does not require) trailing commas when the last element or property is in a different line than the closing ] or } and disallows trailing commas when the last element or property is on the same line as the closing ] or }

            Trailing commas in function declarations and function calls are valid syntax since ECMAScript 2017; however, the string option does not check these situations for backwards compatibility.

            You can also use an object option to configure this rule for each type of syntax. Each of the following options can be set to "never", "always", "always-multiline", "only-multiline", or "ignore". The default for each option is "never" unless otherwise specified.

            • arrays is for array literals and array patterns of destructuring. (e.g. let [a,] = [1,];)
            • objects is for object literals and object patterns of destructuring. (e.g. let {a,} = {a: 1};)
            • imports is for import declarations of ES Modules. (e.g. import {a,} from "foo";)
            • exports is for export declarations of ES Modules. (e.g. export {a,};)
            • functions is for function declarations and function calls. (e.g. (function(a,){ })(b,);)
              functions is set to "ignore" by default for consistency with the string option.

            never

            Examples of incorrect code for this rule with the default "never" option:

            /*eslint comma-dangle: ["error", "never"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var arr = [1,2,];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            Examples of correct code for this rule with the default "never" option:

            /*eslint comma-dangle: ["error", "never"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var arr = [1,2];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            always

            Examples of incorrect code for this rule with the "always" option:

            /*eslint comma-dangle: ["error", "always"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var arr = [1,2];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            Examples of correct code for this rule with the "always" option:

            /*eslint comma-dangle: ["error", "always"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var arr = [1,2,];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            always-multiline

            Examples of incorrect code for this rule with the "always-multiline" option:

            /*eslint comma-dangle: ["error", "always-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var foo = { bar: "baz", qux: "quux", };
            
            var arr = [1,2,];
            
            var arr = [1,
                2,];
            
            var arr = [
                1,
                2
            ];
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            Examples of correct code for this rule with the "always-multiline" option:

            /*eslint comma-dangle: ["error", "always-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var foo = {bar: "baz", qux: "quux"};
            var arr = [1,2];
            
            var arr = [1,
                2];
            
            var arr = [
                1,
                2,
            ];
            
            foo({
              bar: "baz",
              qux: "quux",
            });

            only-multiline

            Examples of incorrect code for this rule with the "only-multiline" option:

            /*eslint comma-dangle: ["error", "only-multiline"]*/
            
            var foo = { bar: "baz", qux: "quux", };
            
            var arr = [1,2,];
            
            var arr = [1,
                2,];

            Examples of correct code for this rule with the "only-multiline" option:

            /*eslint comma-dangle: ["error", "only-multiline"]*/
            
            var foo = {
                bar: "baz",
                qux: "quux",
            };
            
            var foo = {
                bar: "baz",
                qux: "quux"
            };
            
            var foo = {bar: "baz", qux: "quux"};
            var arr = [1,2];
            
            var arr = [1,
                2];
            
            var arr = [
                1,
                2,
            ];
            
            var arr = [
                1,
                2
            ];
            
            foo({
              bar: "baz",
              qux: "quux",
            });
            
            foo({
              bar: "baz",
              qux: "quux"
            });

            functions

            Examples of incorrect code for this rule with the {"functions": "never"} option:

            /*eslint comma-dangle: ["error", {"functions": "never"}]*/
            
            function foo(a, b,) {
            }
            
            foo(a, b,);
            new foo(a, b,);

            Examples of correct code for this rule with the {"functions": "never"} option:

            /*eslint comma-dangle: ["error", {"functions": "never"}]*/
            
            function foo(a, b) {
            }
            
            foo(a, b);
            new foo(a, b);

            Examples of incorrect code for this rule with the {"functions": "always"} option:

            /*eslint comma-dangle: ["error", {"functions": "always"}]*/
            
            function foo(a, b) {
            }
            
            foo(a, b);
            new foo(a, b);

            Examples of correct code for this rule with the {"functions": "always"} option:

            /*eslint comma-dangle: ["error", {"functions": "always"}]*/
            
            function foo(a, b,) {
            }
            
            foo(a, b,);
            new foo(a, b,);

            When Not To Use It

            You can turn this rule off if you are not concerned with dangling commas. Source: http://eslint.org/docs/rules/

            Unexpected parentheses around single function argument having a body with no curly braces
            Open

                    (newSettings) => appendSettings(newSettings)
            Severity: Minor
            Found in src/cli/runCli.js by eslint

            Require parens in arrow function arguments (arrow-parens)

            Arrow functions can omit parentheses when they have exactly one parameter. In all other cases the parameter(s) must be wrapped in parentheses. This rule enforces the consistent use of parentheses in arrow functions.

            Rule Details

            This rule enforces parentheses around arrow function parameters regardless of arity. For example:

            /*eslint-env es6*/
            
            // Bad
            a => {}
            
            // Good
            (a) => {}

            Following this style will help you find arrow functions (=>) which may be mistakenly included in a condition when a comparison such as >= was the intent.

            /*eslint-env es6*/
            
            // Bad
            if (a => 2) {
            }
            
            // Good
            if (a >= 2) {
            }

            The rule can also be configured to discourage the use of parens when they are not required:

            /*eslint-env es6*/
            
            // Bad
            (a) => {}
            
            // Good
            a => {}

            Options

            This rule has a string option and an object one.

            String options are:

            • "always" (default) requires parens around arguments in all cases.
            • "as-needed" allows omitting parens when there is only one argument.

            Object properties for variants of the "as-needed" option:

            • "requireForBlockBody": true modifies the as-needed rule in order to require parens if the function body is in an instructions block (surrounded by braces).

            always

            Examples of incorrect code for this rule with the default "always" option:

            /*eslint arrow-parens: ["error", "always"]*/
            /*eslint-env es6*/
            
            a => {};
            a => a;
            a => {'\n'};
            a.then(foo => {});
            a.then(foo => a);
            a(foo => { if (true) {} });

            Examples of correct code for this rule with the default "always" option:

            /*eslint arrow-parens: ["error", "always"]*/
            /*eslint-env es6*/
            
            () => {};
            (a) => {};
            (a) => a;
            (a) => {'\n'}
            a.then((foo) => {});
            a.then((foo) => { if (true) {} });

            If Statements

            One of benefits of this option is that it prevents the incorrect use of arrow functions in conditionals:

            /*eslint-env es6*/
            
            var a = 1;
            var b = 2;
            // ...
            if (a => b) {
             console.log('bigger');
            } else {
             console.log('smaller');
            }
            // outputs 'bigger', not smaller as expected

            The contents of the if statement is an arrow function, not a comparison.

            If the arrow function is intentional, it should be wrapped in parens to remove ambiguity.

            /*eslint-env es6*/
            
            var a = 1;
            var b = 0;
            // ...
            if ((a) => b) {
             console.log('truthy value returned');
            } else {
             console.log('falsey value returned');
            }
            // outputs 'truthy value returned'

            The following is another example of this behavior:

            /*eslint-env es6*/
            
            var a = 1, b = 2, c = 3, d = 4;
            var f = a => b ? c: d;
            // f = ?

            f is an arrow function which takes a as an argument and returns the result of b ? c: d.

            This should be rewritten like so:

            /*eslint-env es6*/
            
            var a = 1, b = 2, c = 3, d = 4;
            var f = (a) => b ? c: d;

            as-needed

            Examples of incorrect code for this rule with the "as-needed" option:

            /*eslint arrow-parens: ["error", "as-needed"]*/
            /*eslint-env es6*/
            
            (a) => {};
            (a) => a;
            (a) => {'\n'};
            a.then((foo) => {});
            a.then((foo) => a);
            a((foo) => { if (true) {} });

            Examples of correct code for this rule with the "as-needed" option:

            /*eslint arrow-parens: ["error", "as-needed"]*/
            /*eslint-env es6*/
            
            () => {};
            a => {};
            a => a;
            a => {'\n'};
            a.then(foo => {});
            a.then(foo => { if (true) {} });
            (a, b, c) => a;
            (a = 10) => a;
            ([a, b]) => a;
            ({a, b}) => a;

            requireForBlockBody

            Examples of incorrect code for the { "requireForBlockBody": true } option:

            /*eslint arrow-parens: [2, "as-needed", { "requireForBlockBody": true }]*/
            /*eslint-env es6*/
            
            (a) => a;
            a => {};
            a => {'\n'};
            a.map((x) => x * x);
            a.map(x => {
              return x * x;
            });
            a.then(foo => {});

            Examples of correct code for the { "requireForBlockBody": true } option:

            /*eslint arrow-parens: [2, "as-needed", { "requireForBlockBody": true }]*/
            /*eslint-env es6*/
            
            (a) => {};
            (a) => {'\n'};
            a => ({});
            () => {};
            a => a;
            a.then((foo) => {});
            a.then((foo) => { if (true) {} });
            a((foo) => { if (true) {} });
            (a, b, c) => a;
            (a = 10) => a;
            ([a, b]) => a;
            ({a, b}) => a;

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