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feat: Add no-empty-component-block rule (#1222)
* feat: Add no-empty-component-block rule * chore: run update * feat: consider whether exist node.templateBody * refactor: use parserServices.getDocumentFragment * feat: consider whether exists context.parserServices.getDocumentFragment * feat: consider whitespaces and break lines * chore run update * refactor: reflect PR review
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--- | ||
pageClass: rule-details | ||
sidebarDepth: 0 | ||
title: vue/no-empty-component-block | ||
description: disallow the `<template>` `<script>` `<style>` block to be empty | ||
--- | ||
# vue/no-empty-component-block | ||
> disallow the `<template>` `<script>` `<style>` block to be empty | ||
## :book: Rule Details | ||
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This rule disallows the `<template>` `<script>` `<style>` block to be empty. | ||
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This rule also checks block what has attribute `src`. | ||
See: https://vue-loader.vuejs.org/spec.html#src-imports | ||
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<eslint-code-block :rules="{'vue/no-empty-component-block': ['error']}"> | ||
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```vue | ||
// ✓ GOOD | ||
<template> | ||
<p>foo</p> | ||
</template> | ||
<script> | ||
console.log('foo') | ||
</script> | ||
<style> | ||
p { | ||
display: inline; | ||
} | ||
</style> | ||
<template src="./template.html"></template> | ||
<template src="./template.html" /> | ||
<script src="./script.js"></script> | ||
<script src="./script.js" /> | ||
<style src="./style.css"></style> | ||
<style src="./style.css" /> | ||
// ✗ BAD | ||
<template></template> | ||
<template /> | ||
<template src="" /> | ||
<script></script> | ||
<script /> | ||
<script src="" /> | ||
<style></style> | ||
<style /> | ||
<style src="" /> | ||
``` | ||
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</eslint-code-block> | ||
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## :wrench: Options | ||
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Nothing. | ||
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## :mag: Implementation | ||
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- [Rule source](https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/no-empty-component-block.js) | ||
- [Test source](https://github.com/vuejs/eslint-plugin-vue/blob/master/tests/lib/rules/no-empty-component-block.js) |
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/** | ||
* @author tyankatsu <https://github.com/tyankatsu0105> | ||
* See LICENSE file in root directory for full license. | ||
*/ | ||
'use strict' | ||
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// ------------------------------------------------------------------------------ | ||
// Requirements | ||
// ------------------------------------------------------------------------------ | ||
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// ------------------------------------------------------------------------------ | ||
// Rule Definition | ||
// ------------------------------------------------------------------------------ | ||
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/** | ||
* check whether has attribute `src` | ||
*/ | ||
function hasAttributeSrc(componentBlock) { | ||
const hasAttribute = componentBlock.startTag.attributes.length > 0 | ||
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const hasSrc = | ||
componentBlock.startTag.attributes.filter( | ||
(attribute) => | ||
attribute.key.name === 'src' && attribute.value.value !== '' | ||
).length > 0 | ||
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return hasAttribute && hasSrc | ||
} | ||
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/** | ||
* check whether value under the component block is only whitespaces or break lines | ||
*/ | ||
function isValueOnlyWhiteSpacesOrLineBreaks(componentBlock) { | ||
return ( | ||
componentBlock.children.length === 1 && | ||
componentBlock.children[0].type === 'VText' && | ||
!componentBlock.children[0].value.trim() | ||
) | ||
} | ||
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module.exports = { | ||
meta: { | ||
type: 'suggestion', | ||
docs: { | ||
description: | ||
'disallow the `<template>` `<script>` `<style>` block to be empty', | ||
categories: undefined, | ||
url: 'https://eslint.vuejs.org/rules/no-empty-component-block.html' | ||
}, | ||
fixable: null, | ||
schema: [], | ||
messages: { | ||
unexpected: '`<{{ blockName }}>` is empty. Empty block is not allowed.' | ||
} | ||
}, | ||
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/** | ||
* @param {RuleContext} context - The rule context. | ||
* @returns {RuleListener} AST event handlers. | ||
*/ | ||
create(context) { | ||
if (!context.parserServices.getDocumentFragment) { | ||
return {} | ||
} | ||
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const componentBlocks = context.parserServices.getDocumentFragment() | ||
.children | ||
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return { | ||
Program(node) { | ||
for (const componentBlock of componentBlocks) { | ||
if ( | ||
componentBlock.name !== 'template' && | ||
componentBlock.name !== 'script' && | ||
componentBlock.name !== 'style' | ||
) | ||
continue | ||
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// https://vue-loader.vuejs.org/spec.html#src-imports | ||
if (hasAttributeSrc(componentBlock)) continue | ||
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if ( | ||
isValueOnlyWhiteSpacesOrLineBreaks(componentBlock) || | ||
componentBlock.children.length === 0 | ||
) { | ||
context.report({ | ||
node: componentBlock, | ||
loc: componentBlock.loc, | ||
messageId: 'unexpected', | ||
data: { | ||
blockName: componentBlock.name | ||
} | ||
}) | ||
} | ||
} | ||
} | ||
} | ||
} | ||
} |
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/** | ||
* @author tyankatsu <https://github.com/tyankatsu0105> | ||
*/ | ||
'use strict' | ||
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const RuleTester = require('eslint').RuleTester | ||
const rule = require('../../../lib/rules/no-empty-component-block') | ||
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const tester = new RuleTester({ | ||
parser: require.resolve('vue-eslint-parser'), | ||
parserOptions: { ecmaVersion: 2018 } | ||
}) | ||
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tester.run('no-empty-component-block', rule, { | ||
valid: [ | ||
`<template><p>foo</p></template>`, | ||
`<template> foobar </template>`, | ||
`<template><p>foo</p></template><script>console.log('foo')</script>`, | ||
`<template><p>foo</p></template><script>console.log('foo')</script><style>p{display: inline;}</style>`, | ||
`<template src="./template.html"></template>`, | ||
`<template src="./template.html" />`, | ||
`<template src="./template.html"></template><script src="./script.js"></script>`, | ||
`<template src="./template.html" /><script src="./script.js" />`, | ||
`<template src="./template.html"></template><script src="./script.js"></script><style src="./style.css"></style>`, | ||
`<template src="./template.html" /><script src="./script.js" /><style src="./style.css" />` | ||
], | ||
invalid: [ | ||
{ | ||
code: `<template></template>`, | ||
errors: [ | ||
{ | ||
message: '`<template>` is empty. Empty block is not allowed.' | ||
} | ||
] | ||
}, | ||
{ | ||
code: `<template> </template>`, | ||
errors: [ | ||
{ | ||
message: '`<template>` is empty. Empty block is not allowed.' | ||
} | ||
] | ||
}, | ||
{ | ||
code: `<template> | ||
</template>`, | ||
errors: [ | ||
{ | ||
message: '`<template>` is empty. Empty block is not allowed.' | ||
} | ||
] | ||
}, | ||
{ | ||
code: '<template />', | ||
errors: [ | ||
{ | ||
message: '`<template>` is empty. Empty block is not allowed.' | ||
} | ||
] | ||
}, | ||
{ | ||
code: '<template src="" />', | ||
errors: [ | ||
{ | ||
message: '`<template>` is empty. Empty block is not allowed.' | ||
} | ||
] | ||
}, | ||
{ | ||
code: '<template></template><script></script>', | ||
errors: [ | ||
{ | ||
message: '`<template>` is empty. Empty block is not allowed.' | ||
}, | ||
{ | ||
message: '`<script>` is empty. Empty block is not allowed.' | ||
} | ||
] | ||
}, | ||
{ | ||
code: '<template /><script />', | ||
errors: [ | ||
{ | ||
message: '`<template>` is empty. Empty block is not allowed.' | ||
}, | ||
{ | ||
message: '`<script>` is empty. Empty block is not allowed.' | ||
} | ||
] | ||
}, | ||
{ | ||
code: '<template src="" /><script src="" />', | ||
errors: [ | ||
{ | ||
message: '`<template>` is empty. Empty block is not allowed.' | ||
}, | ||
{ | ||
message: '`<script>` is empty. Empty block is not allowed.' | ||
} | ||
] | ||
}, | ||
{ | ||
code: '<template></template><script></script><style></style>', | ||
errors: [ | ||
{ | ||
message: '`<template>` is empty. Empty block is not allowed.' | ||
}, | ||
{ | ||
message: '`<script>` is empty. Empty block is not allowed.' | ||
}, | ||
{ | ||
message: '`<style>` is empty. Empty block is not allowed.' | ||
} | ||
] | ||
}, | ||
{ | ||
code: '<template /><script /><style />', | ||
errors: [ | ||
{ | ||
message: '`<template>` is empty. Empty block is not allowed.' | ||
}, | ||
{ | ||
message: '`<script>` is empty. Empty block is not allowed.' | ||
}, | ||
{ | ||
message: '`<style>` is empty. Empty block is not allowed.' | ||
} | ||
] | ||
}, | ||
{ | ||
code: '<template src="" /><script src="" /><style src="" />', | ||
errors: [ | ||
{ | ||
message: '`<template>` is empty. Empty block is not allowed.' | ||
}, | ||
{ | ||
message: '`<script>` is empty. Empty block is not allowed.' | ||
}, | ||
{ | ||
message: '`<style>` is empty. Empty block is not allowed.' | ||
} | ||
] | ||
} | ||
] | ||
}) |