no-mixed-spaces-and-tabs

The "extends": "eslint:recommended" property in a configuration file enables this rule.

Disallows mixed spaces and tabs for indentation.

Most code conventions require either tabs or spaces be used for indentation. As such, it's usually an error if a single line of code is indented with both tabs and spaces.

Rule Details

This rule disallows mixed spaces and tabs for indentation.

Examples of incorrect code for this rule:

/*eslint no-mixed-spaces-and-tabs: "error"*/

function add(x, y) {
// --->..return x + y;

      return x + y;
}

function main() {
// --->var x = 5,
// --->....y = 7;

    var x = 5,
        y = 7;
}

Examples of correct code for this rule:

/*eslint no-mixed-spaces-and-tabs: "error"*/

function add(x, y) {
// --->return x + y;
    return x + y;
}

Options

This rule has a string option.

smart-tabs

Examples of correct code for this rule with the "smart-tabs" option:

/*eslint no-mixed-spaces-and-tabs: ["error", "smart-tabs"]*/

function main() {
// --->var x = 5,
// --->....y = 7;

    var x = 5,
        y = 7;
}

Further Reading

Version

This rule was introduced in ESLint 0.7.1.

Resources