a-miyashita/gulp-custom-filter

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Similar blocks of code found in 2 locations. Consider refactoring.
Open

function and() {
    var filters = Array.prototype.slice.call(arguments);
    return function(file, encode) {
        return Promise.all(filters.map(function(filter) {
            assertIsFunction(filter, 'and', 'filters');
Severity: Major
Found in lib/basic-filters.js and 1 other location - About 4 hrs to fix
lib/basic-filters.js on lines 30..41

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 121.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Similar blocks of code found in 2 locations. Consider refactoring.
Open

function or() {
    var filters = Array.prototype.slice.call(arguments);
    return function(file, encode) {
        return Promise.all(filters.map(function(filter) {
            assertIsFunction(filter, 'or', 'filters');
Severity: Major
Found in lib/basic-filters.js and 1 other location - About 4 hrs to fix
lib/basic-filters.js on lines 17..28

Duplicated Code

Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

Tuning

This issue has a mass of 121.

We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

Refactorings

Further Reading

Function ignore has 38 lines of code (exceeds 25 allowed). Consider refactoring.
Open

function ignore(filename) {
    assertIsString(filename, 'ignore', 'filename');
    var ignoreFilter = null;
    var error = null;
    var queue = [];
Severity: Minor
Found in lib/pattern-filters.js - About 1 hr to fix

    Similar blocks of code found in 2 locations. Consider refactoring.
    Open

    function isString(str, moduleName, targetName) {
        if (!str || typeof str !== 'string') {
            throw new PluginError('gulp-custom-filter' + (moduleName ? '.' + moduleName : ''),
                    (targetName || str) + ' must be a string');
        }
    Severity: Major
    Found in lib/assertions.js and 1 other location - About 1 hr to fix
    lib/assertions.js on lines 5..10

    Duplicated Code

    Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

    Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

    When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

    Tuning

    This issue has a mass of 60.

    We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

    The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

    If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

    See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

    Refactorings

    Further Reading

    Similar blocks of code found in 2 locations. Consider refactoring.
    Open

    function isFunction(fn, moduleName, targetName) {
        if (!fn || typeof fn !== 'function') {
            throw new PluginError('gulp-custom-filter' + (moduleName ? '.' + moduleName : ''),
                    (targetName || fn) + ' must be a function');
        }
    Severity: Major
    Found in lib/assertions.js and 1 other location - About 1 hr to fix
    lib/assertions.js on lines 12..17

    Duplicated Code

    Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:

    Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.

    When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).

    Tuning

    This issue has a mass of 60.

    We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.

    The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.

    If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.

    See codeclimate-duplication's documentation for more information about tuning the mass threshold in your .codeclimate.yml.

    Refactorings

    Further Reading

    Parsing error: Unexpected token )
    Open

    gulp.task('test:pre', () =>
    Severity: Minor
    Found in gulpfile.js by eslint

    For more information visit Source: http://eslint.org/docs/rules/

    'encode' is defined but never used.
    Open

        return function(file, encode) {
    Severity: Minor
    Found in lib/pattern-filters.js by eslint

    Disallow Unused Variables (no-unused-vars)

    Variables that are declared and not used anywhere in the code are most likely an error due to incomplete refactoring. Such variables take up space in the code and can lead to confusion by readers.

    Rule Details

    This rule is aimed at eliminating unused variables, functions, and parameters of functions.

    A variable is considered to be used if any of the following are true:

    • It represents a function that is called (doSomething())
    • It is read (var y = x)
    • It is passed into a function as an argument (doSomething(x))
    • It is read inside of a function that is passed to another function (doSomething(function() { foo(); }))

    A variable is not considered to be used if it is only ever assigned to (var x = 5) or declared.

    Examples of incorrect code for this rule:

    /*eslint no-unused-vars: "error"*/
    /*global some_unused_var*/
    
    // It checks variables you have defined as global
    some_unused_var = 42;
    
    var x;
    
    // Write-only variables are not considered as used.
    var y = 10;
    y = 5;
    
    // A read for a modification of itself is not considered as used.
    var z = 0;
    z = z + 1;
    
    // By default, unused arguments cause warnings.
    (function(foo) {
        return 5;
    })();
    
    // Unused recursive functions also cause warnings.
    function fact(n) {
        if (n < 2) return 1;
        return n * fact(n - 1);
    }
    
    // When a function definition destructures an array, unused entries from the array also cause warnings.
    function getY([x, y]) {
        return y;
    }

    Examples of correct code for this rule:

    /*eslint no-unused-vars: "error"*/
    
    var x = 10;
    alert(x);
    
    // foo is considered used here
    myFunc(function foo() {
        // ...
    }.bind(this));
    
    (function(foo) {
        return foo;
    })();
    
    var myFunc;
    myFunc = setTimeout(function() {
        // myFunc is considered used
        myFunc();
    }, 50);
    
    // Only the second argument from the descructured array is used.
    function getY([, y]) {
        return y;
    }

    exported

    In environments outside of CommonJS or ECMAScript modules, you may use var to create a global variable that may be used by other scripts. You can use the /* exported variableName */ comment block to indicate that this variable is being exported and therefore should not be considered unused.

    Note that /* exported */ has no effect for any of the following:

    • when the environment is node or commonjs
    • when parserOptions.sourceType is module
    • when ecmaFeatures.globalReturn is true

    The line comment // exported variableName will not work as exported is not line-specific.

    Examples of correct code for /* exported variableName */ operation:

    /* exported global_var */
    
    var global_var = 42;

    Options

    This rule takes one argument which can be a string or an object. The string settings are the same as those of the vars property (explained below).

    By default this rule is enabled with all option for variables and after-used for arguments.

    {
        "rules": {
            "no-unused-vars": ["error", { "vars": "all", "args": "after-used", "ignoreRestSiblings": false }]
        }
    }

    vars

    The vars option has two settings:

    • all checks all variables for usage, including those in the global scope. This is the default setting.
    • local checks only that locally-declared variables are used but will allow global variables to be unused.

    vars: local

    Examples of correct code for the { "vars": "local" } option:

    /*eslint no-unused-vars: ["error", { "vars": "local" }]*/
    /*global some_unused_var */
    
    some_unused_var = 42;

    varsIgnorePattern

    The varsIgnorePattern option specifies exceptions not to check for usage: variables whose names match a regexp pattern. For example, variables whose names contain ignored or Ignored.

    Examples of correct code for the { "varsIgnorePattern": "[iI]gnored" } option:

    /*eslint no-unused-vars: ["error", { "varsIgnorePattern": "[iI]gnored" }]*/
    
    var firstVarIgnored = 1;
    var secondVar = 2;
    console.log(secondVar);

    args

    The args option has three settings:

    • after-used - only the last argument must be used. This allows you, for instance, to have two named parameters to a function and as long as you use the second argument, ESLint will not warn you about the first. This is the default setting.
    • all - all named arguments must be used.
    • none - do not check arguments.

    args: after-used

    Examples of incorrect code for the default { "args": "after-used" } option:

    /*eslint no-unused-vars: ["error", { "args": "after-used" }]*/
    
    // 1 error
    // "baz" is defined but never used
    (function(foo, bar, baz) {
        return bar;
    })();

    Examples of correct code for the default { "args": "after-used" } option:

    /*eslint no-unused-vars: ["error", {"args": "after-used"}]*/
    
    (function(foo, bar, baz) {
        return baz;
    })();

    args: all

    Examples of incorrect code for the { "args": "all" } option:

    /*eslint no-unused-vars: ["error", { "args": "all" }]*/
    
    // 2 errors
    // "foo" is defined but never used
    // "baz" is defined but never used
    (function(foo, bar, baz) {
        return bar;
    })();

    args: none

    Examples of correct code for the { "args": "none" } option:

    /*eslint no-unused-vars: ["error", { "args": "none" }]*/
    
    (function(foo, bar, baz) {
        return bar;
    })();

    ignoreRestSiblings

    The ignoreRestSiblings option is a boolean (default: false). Using a Rest Property it is possible to "omit" properties from an object, but by default the sibling properties are marked as "unused". With this option enabled the rest property's siblings are ignored.

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

    /*eslint no-unused-vars: ["error", { "ignoreRestSiblings": true }]*/
    // 'type' is ignored because it has a rest property sibling.
    var { type, ...coords } = data;

    argsIgnorePattern

    The argsIgnorePattern option specifies exceptions not to check for usage: arguments whose names match a regexp pattern. For example, variables whose names begin with an underscore.

    Examples of correct code for the { "argsIgnorePattern": "^_" } option:

    /*eslint no-unused-vars: ["error", { "argsIgnorePattern": "^_" }]*/
    
    function foo(x, _y) {
        return x + 1;
    }
    foo();

    caughtErrors

    The caughtErrors option is used for catch block arguments validation.

    It has two settings:

    • none - do not check error objects. This is the default setting.
    • all - all named arguments must be used.

    caughtErrors: none

    Not specifying this rule is equivalent of assigning it to none.

    Examples of correct code for the { "caughtErrors": "none" } option:

    /*eslint no-unused-vars: ["error", { "caughtErrors": "none" }]*/
    
    try {
        //...
    } catch (err) {
        console.error("errors");
    }

    caughtErrors: all

    Examples of incorrect code for the { "caughtErrors": "all" } option:

    /*eslint no-unused-vars: ["error", { "caughtErrors": "all" }]*/
    
    // 1 error
    // "err" is defined but never used
    try {
        //...
    } catch (err) {
        console.error("errors");
    }

    caughtErrorsIgnorePattern

    The caughtErrorsIgnorePattern option specifies exceptions not to check for usage: catch arguments whose names match a regexp pattern. For example, variables whose names begin with a string 'ignore'.

    Examples of correct code for the { "caughtErrorsIgnorePattern": "^ignore" } option:

    /*eslint no-unused-vars: ["error", { "caughtErrorsIgnorePattern": "^ignore" }]*/
    
    try {
        //...
    } catch (ignoreErr) {
        console.error("errors");
    }

    When Not To Use It

    If you don't want to be notified about unused variables or function arguments, you can safely turn this rule off. Source: http://eslint.org/docs/rules/

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