jsx-max-props-per-line.md

Limit maximum of props on a single line in JSX (jsx-max-props-per-line)

Limiting the maximum of props on a single line can improve readability.

Rule Details

This rule checks all JSX elements and verifies that the number of props per line do not exceed the maximum allowed. Props are considered to be in a new line if there is a line break between the start of the prop and the end of the previous prop. A spread attribute counts as one prop. This rule is off by default and when on the default maximum of props on one line is 1.

The following patterns are considered warnings:

<Hello lastName="Smith" firstName="John" />;

<Hello foo={{
  bar
}} baz />;

The following patterns are not considered warnings:

<Hello
  firstName="John"
  lastName="Smith"
/>;

<Hello
  {...this.props}
  firstName="John"
  lastName="Smith"
/>;

Rule Options

...
"jsx-max-props-per-line": [<enabled>, { "maximum": <number>, "when": <string> }]
...

maximum

Maximum number of props allowed on a single line. Default to 1.

The following patterns are considered warnings:

// [1, { "maximum": 2 }]
<Hello firstName="John" lastName="Smith" tel={5555555} />;

The following patterns are not considered warnings:

// [1, { "maximum": 2 }]
<Hello
  firstName="John" lastName="Smith"
  tel={5555555}
/>;

when

Possible values:

• always (default) - Always check for max props per line.
• multiline - Only check for max props per line when jsx tag spans multiple lines.

The following patterns are considered warnings:

// [1, { "when": "always" }]
<Hello firstName="John" lastName="Smith" />

The following patterns are not considered warnings:

// [1, { "when": "multiline" }]
<Hello firstName="John" lastName="Smith" />
<Hello 
  firstName="John" 
  lastName="Smith" 
/>

When not to use

If you are not using JSX then you can disable this rule.