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script-setup-uses-vars.js
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script-setup-uses-vars.js
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/**
* @fileoverview Prevent `<script setup>` variables used in `<template>` to be marked as unused
* @author Yosuke Ota
* See LICENSE file in root directory for full license.
*/
'use strict'
const semver = require('semver')
const { RuleTester, ESLint } = require('../../eslint-compat')
const rule = require('../../../lib/rules/script-setup-uses-vars')
const { getCoreRule } = require('../../../lib/utils')
const ruleNoUnusedVars = getCoreRule('no-unused-vars')
const ruleTester = new RuleTester({
languageOptions: {
parser: require('vue-eslint-parser'),
ecmaVersion: 6,
sourceType: 'module'
},
plugins: {
vue: {
rules: {
'script-setup-uses-vars': rule
}
}
}
})
ruleTester.run('script-setup-uses-vars', rule, {
// Visually check that there are no warnings in the console.
valid: [
`
<script setup>
import Foo from './Foo.vue'
</script>
<template>
<Foo />
</template>
`
],
invalid: []
})
describe('script-setup-uses-vars', () => {
ruleTester.run('no-unused-vars', ruleNoUnusedVars, {
valid: [
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
// imported components are also directly usable in template
import Foo from './Foo.vue'
import { ref } from 'vue'
// write Composition API code just like in a normal setup()
// but no need to manually return everything
const count = ref(0)
const inc = () => {
count.value++
}
</script>
<template>
<Foo :count="count" @click="inc" />
</template>
`
},
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
const msg = 'Hello!'
</script>
<template>
<div>{{ msg }}</div>
</template>
`
},
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
import Foo from './Foo.vue'
import MyComponent from './MyComponent.vue'
</script>
<template>
<Foo />
<!-- kebab-case also works -->
<my-component />
</template>
`
},
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
import Foo from './Foo.vue'
import Bar from './Bar.vue'
</script>
<template>
<component :is="Foo" />
<component :is="someCondition ? Foo : Bar" />
</template>
`
},
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
import { directive as vClickOutside } from 'v-click-outside'
</script>
<template>
<div v-click-outside />
</template>
`
},
// Resolve component name
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
import FooPascalCase from './component.vue'
import BarPascalCase from './component.vue'
import BazPascalCase from './component.vue'
</script>
<template>
<FooPascalCase />
<bar-pascal-case />
<bazPascalCase />
</template>
`
},
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
import fooCamelCase from './component.vue'
import barCamelCase from './component.vue'
</script>
<template>
<fooCamelCase />
<bar-camel-case />
</template>
`
},
// TopLevel await
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
const post = await fetch(\`/api/post/1\`).then((r) => r.json())
</script>
<template>
{{post}}
</template>
`,
languageOptions: {
ecmaVersion: 2022,
sourceType: 'module'
}
},
// ref
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
import {ref} from 'vue'
const v = ref(null)
</script>
<template>
<div ref="v"/>
</template>
`
},
//style vars
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
const color = 'red'
const font = { size: '2em' }
</script>
<style>
* {
color: v-bind(color);
font-size: v-bind('font.size');
}
</style>
`
},
// ns
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
import * as Form from './form-components'
</script>
<template>
<Form.Input>
<Form.Label>label</Form.Label>
</Form.Input>
</template>
`
}
],
invalid: [
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
// imported components are also directly usable in template
import Foo from './Foo.vue'
import Bar from './Bar.vue'
import { ref } from 'vue'
// write Composition API code just like in a normal setup()
// but no need to manually return everything
const count = ref(0)
const inc = () => {
count.value++
}
const foo = ref(42)
console.log(foo.value)
const bar = ref(42)
bar.value++
const baz = ref(42)
</script>
<template>
<Foo :count="count" @click="inc" />
</template>
`,
errors: [
{
message: "'Bar' is defined but never used.",
line: 6,
suggestions: semver.gte(ESLint.version, '9.17.0')
? [
{
desc: "Remove unused variable 'Bar'.",
output: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
// imported components are also directly usable in template
import Foo from './Foo.vue'
import './Bar.vue'
import { ref } from 'vue'
// write Composition API code just like in a normal setup()
// but no need to manually return everything
const count = ref(0)
const inc = () => {
count.value++
}
const foo = ref(42)
console.log(foo.value)
const bar = ref(42)
bar.value++
const baz = ref(42)
</script>
<template>
<Foo :count="count" @click="inc" />
</template>
`
}
]
: null
},
{
message: "'baz' is assigned a value but never used.",
line: 19
}
]
},
// Resolve component name
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
import camelCase from './component.vue'
</script>
<template>
<CamelCase />
</template>
`,
errors: [
{
message: "'camelCase' is defined but never used.",
line: 4,
suggestions: semver.gte(ESLint.version, '9.17.0')
? [
{
desc: "Remove unused variable 'camelCase'.",
output: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
import './component.vue'
</script>
<template>
<CamelCase />
</template>
`
}
]
: null
}
]
},
// Scope tests
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
if (a) {
const msg = 'Hello!'
}
</script>
<template>
<div>{{ msg }}</div>
</template>
`,
errors: [
{
message: "'msg' is assigned a value but never used.",
line: 5,
suggestions: semver.gte(ESLint.version, '9.17.0')
? [
{
desc: "Remove unused variable 'msg'.",
output: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
if (a) {
}
</script>
<template>
<div>{{ msg }}</div>
</template>
`
}
]
: null
}
]
},
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
const i = 42
const list = [1,2,3]
</script>
<template>
<div v-for="i in list">{{ i }}</div>
</template>
`,
errors: [
{
message: "'i' is assigned a value but never used.",
line: 4
}
]
},
// Not `<script setup>`
{
filename: 'test.vue',
code: `
<script>
/* eslint vue/script-setup-uses-vars: 1 */
const msg = 'Hello!'
</script>
<template>
<div>{{ msg }}</div>
</template>
`,
errors: [
{
message: "'msg' is assigned a value but never used.",
line: 4
}
]
},
//style vars
{
filename: 'test.vue',
code: `
<script setup>
/* eslint vue/script-setup-uses-vars: 1 */
const color = 'red'
</script>
<style lang="scss">
.v-bind .color {
color: 'v-bind(color)';
background-color: 'v-bind(color)';
}
/* v-bind(color) */
// v-bind(color)
</style>
`,
errors: ["'color' is assigned a value but never used."]
}
]
})
})