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vue/max-len
enforce a maximum line length

vue/max-len

enforce a maximum line length

📖 Rule Details

This rule enforces a maximum line length to increase code readability and maintainability. This rule is the similar rule as core max-len rule but it applies to the source code in .vue.

<template>
  <!-- ✓ GOOD -->
  <div>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit,
    sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
  </div>

  <!-- ✗ BAD -->
  <div>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </div>
  <div>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
  </div>
</template>

<script>
/* ✓ GOOD */
var foo = {
  "bar": "This is a bar.",
  "baz": { "qux": "This is a qux" },
  "easier": "to read"
};

/* ✗ BAD */
var foo = { "bar": "This is a bar.", "baz": { "qux": "This is a qux" }, "difficult": "to read" };
</script>

<style>
/* ignore */
.ignore-stylesheet .blocks-other-than-script-and-template-are-ignored .this-line-has-a-length-of-100
{}
</style>

🔧 Options

{
    "vue/max-len": ["error", {
        "code": 80,
        "template": 80,
        "tabWidth": 2,
        "comments": 80,
        "ignorePattern": "",
        "ignoreComments": false,
        "ignoreTrailingComments": false,
        "ignoreUrls": false,
        "ignoreStrings": false,
        "ignoreTemplateLiterals": false,
        "ignoreRegExpLiterals": false,
        "ignoreHTMLAttributeValues": false,
        "ignoreHTMLTextContents": false,
    }]
}
  • code ... enforces a maximum line length. default 80
  • template ... enforces a maximum line length for <template>. defaults to value of code
  • tabWidth ... specifies the character width for tab characters. default 2
  • comments ... enforces a maximum line length for comments. defaults to value of code
  • ignorePattern ... ignores lines matching a regular expression. can only match a single line and need to be double escaped when written in YAML or JSON
  • ignoreComments ... if true, ignores all trailing comments and comments on their own line. default false
  • ignoreTrailingComments ... if true, ignores only trailing comments. default false
  • ignoreUrls ... if true, ignores lines that contain a URL. default false
  • ignoreStrings ... if true, ignores lines that contain a double-quoted or single-quoted string. default false
  • ignoreTemplateLiterals ... if true, ignores lines that contain a template literal. default false
  • ignoreRegExpLiterals ... if true, ignores lines that contain a RegExp literal. default false
  • ignoreHTMLAttributeValues ... if true, ignores lines that contain a HTML attribute value. default false
  • ignoreHTMLTextContents ... if true, ignores lines that contain a HTML text content. default false

"code": 40

<template>
  <!-- ✓ GOOD -->
  <div>line length is 40 ........ </div>

  <!-- ✗ BAD -->
  <div>line length is 50 .................. </div>
</template>

<script>
/* ✓ GOOD */
var foo = ['line', 'length', 'is', '40']

/* ✗ BAD */
var foo = ['line', 'length', 'is', '50', '......']
</script>

"template": 120

<template>
  <!-- ✓ GOOD -->
  <div>line length is 120 ....................................................................................... </div>

  <!-- ✗ BAD -->
  <div>line length is 121 ........................................................................................ </div>
</template>

<script>
/* ✗ BAD */
var foo = ['line', 'length', 'is', '81', '......', '......', '......', '......'];
</script>

"comments": 65

<template>
<!-- ✓ GOOD -->
<!--
  This is a comment that does not violates
  the maximum line length we have specified
-->

<!-- ✗ BAD -->
<!--
  This is a comment that violates the maximum line length we have specified
-->
</template>

<script>
/* ✓ GOOD */
/**
 * This is a comment that does not violates
 * the maximum line length we have specified
 */

/* ✗ BAD */
/**
 * This is a comment that violates the maximum line length we have specified
 */
</script>

"ignoreComments": true

<template>
  <!-- ✓ GOOD -->
  <!-- This is a really really really really really really really really really long comment -->
</template>

<script>
/* ✓ GOOD */
/**
 * This is a really really really really really really really really really long comment
 */
</script>

"ignoreTrailingComments": true

<template>
  <!-- ✓ GOOD -->
  <div /><!-- This is a really really really really really really really really long comment -->

  <!-- ✗ BAD -->
  <!-- This is a really really really really really really really really long comment -->
</template>

<script>
/* ✓ GOOD */
var foo = 'bar'; // This is a really really really really really really really really long comment

/* ✗ BAD */
// This is a really really really really really really really really long comment
</script>

"ignoreUrls": true

<template>
  <!-- ✓ GOOD -->
  <div style="background-image: url('https://www.example.com/really/really/really/really/really/really/really/long')" />
</template>

<script>
/* ✓ GOOD */
var url = 'https://www.example.com/really/really/really/really/really/really/really/long';
</script>

"ignoreStrings": true

<template>
  <!-- ✓ GOOD -->
  <div :title="'this is a really really really really really really long string!'" />

  <!-- ✗ BAD -->
  <div title="this is a really really really really really really long attribute value!" />
  <div>this is a really really really really really really really long text content!</div>
</template>

<script>
/* ✓ GOOD */
var longString = 'this is a really really really really really really long string!';
</script>

"ignoreTemplateLiterals": true

<template>
  <!-- ✓ GOOD -->
  <div :title="`this is a really really really really really long template literal!`" />
</template>

<script>
/* ✓ GOOD */
var longTemplateLiteral = `this is a really really really really really long template literal!`;
</script>

"ignoreRegExpLiterals": true

<template>
  <!-- ✓ GOOD -->
  <div :class="{
    foo: /this is a really really really really really long regular expression!/.test(bar)
  }" />
</template>

<script>
/* ✓ GOOD */
var longRegExpLiteral = /this is a really really really really really long regular expression!/;
</script>

"ignoreHTMLAttributeValues": true

<template>
  <!-- ✓ GOOD -->
  <div title="this is a really really really really really really long attribute value!" />

  <!-- ✗ BAD -->
  <div :title="'this is a really really really really really really long string!'" />
</template>

"ignoreHTMLTextContents": true

<template>
  <!-- ✓ GOOD -->
  <div>this is a really really really really really really really long text content!</div>
</template>

📚 Further Reading

🔍 Implementation

Taken with ❤️ from ESLint core