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no-mixed-spaces-and-tabs

Disallow mixed spaces and tabs for indentation

โœ… Recommended

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

Most code conventions require either tabs or spaces be used for indentation. As such, itโ€™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" allows mixed tabs and spaces when the spaces are used for alignment.

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;
}

Version

This rule was introduced in ESLint v0.7.1.

Further Reading

Resources