if (typeof value.input === 'undefined' || value.input === null || value.input.length <= 0) {

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

                    lastError.message = `input for ${value.field} should not be empty`;

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

    }

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

            if (currentRule.notEmpty === true) {

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

                }

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

            // Checking Data Type

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

        if (typeof lastError.status !== 'undefined') { return lastError; }

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

            const currentRule = value.rules;

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

        });

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

    if (typeof data !== 'undefined' && data.length > 0) {

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

            // Checking for empty data

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

                    (currentRule.type === 'number' && currentRule.notEmpty === true && isNaN(value.input))) {

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

        const lastError = {};

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

                    lastError.status = false;

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

                if ((typeof value.input !== 'undefined' && typeof value.input !== currentRule.type) ||

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

                    lastError.statusCode = 422;

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

                    lastError.message = `input for ${value.field} ('${value.input}') is not of type ${currentRule.type}`;

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

            }

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

    return { status: false, statusCode: 411, message: 'no information was given' };

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

                    lastError.status = false;

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

                    lastError.statusCode = 411;

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

            }

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

        data.forEach(function(value) {

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

            if (typeof currentRule.type !== 'undefined') {

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

                }

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

        return { status: true };

Close

disallow all tabs (no-tabs)

Some style guides don't allow the use of tab characters at all, including within comments.

Rule Details

This rule looks for tabs anywhere inside a file: code, comments or anything else.

Examples of incorrect code for this rule:

var a /t= 2;

/**
* /t/t it's a test function
*/
function test(){}

var x = 1; // /t test

Examples of correct code for this rule:

var a = 2;

/**
* it's a test function
*/
function test(){}

var x = 1; // test

When Not To Use It

If you have established a standard where having tabs is fine.

Compatibility

• JSCS: disallowTabs Source: http://eslint.org/docs/rules/

                if ((typeof value.input !== 'undefined' && typeof value.input !== currentRule.type) ||

Close

enforce comparing typeof expressions against valid strings (valid-typeof)

For a vast majority of use cases, the result of the typeof operator is one of the following string literals: "undefined", "object", "boolean", "number", "string", "function" and "symbol". It is usually a typing mistake to compare the result of a typeof operator to other string literals.

Rule Details

This rule enforces comparing typeof expressions to valid string literals.

Options

This rule has an object option:

• "requireStringLiterals": true requires typeof expressions to only be compared to string literals or other typeof expressions, and disallows comparisons to any other value.

Examples of incorrect code for this rule:

/*eslint valid-typeof: "error"*/

typeof foo === "strnig"
typeof foo == "undefimed"
typeof bar != "nunber"
typeof bar !== "fucntion"

Examples of correct code for this rule:

/*eslint valid-typeof: "error"*/

typeof foo === "string"
typeof bar == "undefined"
typeof foo === baz
typeof bar === typeof qux

Examples of incorrect code with the { "requireStringLiterals": true } option:

typeof foo === undefined
typeof bar == Object
typeof baz === "strnig"
typeof qux === "some invalid type"
typeof baz === anotherVariable
typeof foo == 5

Examples of correct code with the { "requireStringLiterals": true } option:

typeof foo === "undefined"
typeof bar == "object"
typeof baz === "string"
typeof bar === typeof qux

When Not To Use It

You may want to turn this rule off if you will be using the typeof operator on host objects. Source: http://eslint.org/docs/rules/