no-mixed-spaces-and-tabs.md

title	rule_type	further_reading
no-mixed-spaces-and-tabs	layout	https://www.emacswiki.org/emacs/SmartTabs

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:

::: incorrect

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

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

function main() {
	var x = 5,
	    y = 7;
}

:::

Examples of correct code for this rule:

::: correct

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

function add(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:

::: correct

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

function main() {
	var x = 5,
	    y = 7;
}

:::