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vue/no-watch-after-await
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--- | ||
pageClass: rule-details | ||
sidebarDepth: 0 | ||
title: vue/no-watch-after-await | ||
description: disallow asynchronously registered `watch` | ||
--- | ||
# vue/no-watch-after-await | ||
> disallow asynchronously registered `watch` | ||
## :book: Rule Details | ||
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This rule reports the `watch()` after `await` expression. | ||
In `setup()` function, `watch()` should be registered synchronously. | ||
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<eslint-code-block :rules="{'vue/no-watch-after-await': ['error']}"> | ||
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```vue | ||
<script> | ||
import { watch } from 'vue' | ||
export default { | ||
async setup() { | ||
/* ✓ GOOD */ | ||
watch(() => { /* ... */ }) | ||
await doSomething() | ||
/* ✗ BAD */ | ||
watch(() => { /* ... */ }) | ||
} | ||
} | ||
</script> | ||
``` | ||
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</eslint-code-block> | ||
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## :wrench: Options | ||
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Nothing. | ||
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## :books: Further reading | ||
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- [Vue RFCs - 0013-composition-api](https://github.com/vuejs/rfcs/blob/master/active-rfcs/0013-composition-api.md) | ||
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## :mag: Implementation | ||
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- [Rule source](https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/no-watch-after-await.js) | ||
- [Test source](https://github.com/vuejs/eslint-plugin-vue/blob/master/tests/lib/rules/no-watch-after-await.js) |
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/** | ||
* @author Yosuke Ota | ||
* See LICENSE file in root directory for full license. | ||
*/ | ||
'use strict' | ||
const { ReferenceTracker } = require('eslint-utils') | ||
const utils = require('../utils') | ||
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module.exports = { | ||
meta: { | ||
type: 'suggestion', | ||
docs: { | ||
description: 'disallow asynchronously registered `watch`', | ||
category: undefined, | ||
url: 'https://eslint.vuejs.org/rules/no-watch-after-await.html' | ||
}, | ||
fixable: null, | ||
schema: [], | ||
messages: { | ||
forbidden: 'The `watch` after `await` expression are forbidden.' | ||
} | ||
}, | ||
create (context) { | ||
const watchCallNodes = new Set() | ||
const setupFunctions = new Map() | ||
const forbiddenNodes = new Map() | ||
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function addForbiddenNode (property, node) { | ||
let list = forbiddenNodes.get(property) | ||
if (!list) { | ||
list = [] | ||
forbiddenNodes.set(property, list) | ||
} | ||
list.push(node) | ||
} | ||
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let scopeStack = { upper: null, functionNode: null } | ||
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return Object.assign( | ||
{ | ||
'Program' () { | ||
const tracker = new ReferenceTracker(context.getScope()) | ||
const traceMap = { | ||
vue: { | ||
[ReferenceTracker.ESM]: true, | ||
watch: { | ||
[ReferenceTracker.CALL]: true | ||
} | ||
} | ||
} | ||
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for (const { node } of tracker.iterateEsmReferences(traceMap)) { | ||
watchCallNodes.add(node) | ||
} | ||
}, | ||
'Property[value.type=/^(Arrow)?FunctionExpression$/]' (node) { | ||
if (utils.getStaticPropertyName(node) !== 'setup') { | ||
return | ||
} | ||
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setupFunctions.set(node.value, { | ||
setupProperty: node, | ||
afterAwait: false | ||
}) | ||
}, | ||
':function' (node) { | ||
scopeStack = { upper: scopeStack, functionNode: node } | ||
}, | ||
'AwaitExpression' () { | ||
const setupFunctionData = setupFunctions.get(scopeStack.functionNode) | ||
if (!setupFunctionData) { | ||
return | ||
} | ||
setupFunctionData.afterAwait = true | ||
}, | ||
'CallExpression' (node) { | ||
const setupFunctionData = setupFunctions.get(scopeStack.functionNode) | ||
if (!setupFunctionData || !setupFunctionData.afterAwait) { | ||
return | ||
} | ||
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if (watchCallNodes.has(node)) { | ||
addForbiddenNode(setupFunctionData.setupProperty, node) | ||
} | ||
}, | ||
':function:exit' (node) { | ||
scopeStack = scopeStack.upper | ||
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setupFunctions.delete(node) | ||
} | ||
}, | ||
utils.executeOnVue(context, obj => { | ||
const reportsList = obj.properties | ||
.map(item => forbiddenNodes.get(item)) | ||
.filter(reports => !!reports) | ||
for (const reports of reportsList) { | ||
for (const node of reports) { | ||
context.report({ | ||
node, | ||
messageId: 'forbidden' | ||
}) | ||
} | ||
} | ||
}) | ||
) | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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/** | ||
* @author Yosuke Ota | ||
*/ | ||
'use strict' | ||
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const RuleTester = require('eslint').RuleTester | ||
const rule = require('../../../lib/rules/no-watch-after-await') | ||
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const tester = new RuleTester({ | ||
parser: require.resolve('vue-eslint-parser'), | ||
parserOptions: { ecmaVersion: 2019, sourceType: 'module' } | ||
}) | ||
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tester.run('no-watch-after-await', rule, { | ||
valid: [ | ||
{ | ||
filename: 'test.vue', | ||
code: ` | ||
<script> | ||
import {watch} from 'vue' | ||
export default { | ||
async setup() { | ||
watch(() => { /* ... */ }) // ok | ||
await doSomething() | ||
} | ||
} | ||
</script> | ||
` | ||
}, | ||
{ | ||
filename: 'test.vue', | ||
code: ` | ||
<script> | ||
import {watch} from 'vue' | ||
export default { | ||
async setup() { | ||
watch(() => { /* ... */ }) | ||
} | ||
} | ||
</script> | ||
` | ||
}, | ||
{ | ||
filename: 'test.vue', | ||
code: ` | ||
<script> | ||
import {onMounted} from 'vue' | ||
export default { | ||
async _setup() { | ||
await doSomething() | ||
onMounted(() => { /* ... */ }) // error | ||
} | ||
} | ||
</script> | ||
` | ||
} | ||
], | ||
invalid: [ | ||
{ | ||
filename: 'test.vue', | ||
code: ` | ||
<script> | ||
import {watch} from 'vue' | ||
export default { | ||
async setup() { | ||
await doSomething() | ||
watch(() => { /* ... */ }) // error | ||
} | ||
} | ||
</script> | ||
`, | ||
errors: [ | ||
{ | ||
message: 'The `watch` after `await` expression are forbidden.', | ||
line: 8, | ||
column: 11, | ||
endLine: 8, | ||
endColumn: 37 | ||
} | ||
] | ||
}, | ||
{ | ||
filename: 'test.vue', | ||
code: ` | ||
<script> | ||
import {watch} from 'vue' | ||
export default { | ||
async setup() { | ||
await doSomething() | ||
watch(() => { /* ... */ }) | ||
await doSomething() | ||
watch(() => { /* ... */ }) | ||
} | ||
} | ||
</script> | ||
`, | ||
errors: [ | ||
{ | ||
messageId: 'forbidden', | ||
line: 8 | ||
}, | ||
{ | ||
messageId: 'forbidden', | ||
line: 12 | ||
} | ||
] | ||
} | ||
] | ||
}) |