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Add vue/no-multiple-slot-args rule. (#1179)
* Add `vue/no-multiple-slot-args` rule. * Fixed testcase
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‎docs/rules/README.md‎

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@@ -147,6 +147,7 @@ Enforce all the rules in this category, as well as all higher priority rules, wi
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|:--------|:------------|:---|
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| [vue/attributes-order](./attributes-order.md) | enforce order of attributes | :wrench: |
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| [vue/component-tags-order](./component-tags-order.md) | enforce order of component top-level elements | |
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| [vue/no-multiple-slot-args](./no-multiple-slot-args.md) | disallow to pass multiple arguments to scoped slots | |
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| [vue/no-v-html](./no-v-html.md) | disallow use of v-html to prevent XSS attack | |
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| [vue/order-in-components](./order-in-components.md) | enforce order of properties in components | :wrench: |
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| [vue/this-in-template](./this-in-template.md) | disallow usage of `this` in template | |
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|:--------|:------------|:---|
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| [vue/attributes-order](./attributes-order.md) | enforce order of attributes | :wrench: |
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| [vue/component-tags-order](./component-tags-order.md) | enforce order of component top-level elements | |
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| [vue/no-multiple-slot-args](./no-multiple-slot-args.md) | disallow to pass multiple arguments to scoped slots | |
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| [vue/no-v-html](./no-v-html.md) | disallow use of v-html to prevent XSS attack | |
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| [vue/order-in-components](./order-in-components.md) | enforce order of properties in components | :wrench: |
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| [vue/this-in-template](./this-in-template.md) | disallow usage of `this` in template | |

‎docs/rules/no-multiple-slot-args.md‎

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---
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pageClass: rule-details
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sidebarDepth: 0
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title: vue/no-multiple-slot-args
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description: disallow to pass multiple arguments to scoped slots
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---
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# vue/no-multiple-slot-args
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> disallow to pass multiple arguments to scoped slots
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- :gear: This rule is included in `"plugin:vue/vue3-recommended"` and `"plugin:vue/recommended"`.
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## :book: Rule Details
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This rule disallows to pass multiple arguments to scoped slots.
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In details, it reports call expressions if a call of `this.$scopedSlots` members has 2 or more arguments.
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<eslint-code-block :rules="{'vue/no-multiple-slot-args': ['error']}">
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```vue
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<script>
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export default {
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render(h) {
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/* ✓ GOOD */
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var children = this.$scopedSlots.default()
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var children = this.$scopedSlots.default(foo)
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var children = this.$scopedSlots.default({ foo, bar })
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/* ✗ BAD */
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var children = this.$scopedSlots.default(foo, bar)
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var children = this.$scopedSlots.default(...foo)
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}
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}
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</script>
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```
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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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- [vuejs/vue#9468](https://github.com/vuejs/vue/issues/9468#issuecomment-462210146)
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## :mag: Implementation
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- [Rule source](https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/no-multiple-slot-args.js)
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- [Test source](https://github.com/vuejs/eslint-plugin-vue/blob/master/tests/lib/rules/no-multiple-slot-args.js)

‎lib/configs/recommended.js‎

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rules: {
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'vue/attributes-order': 'warn',
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'vue/component-tags-order': 'warn',
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'vue/no-multiple-slot-args': 'warn',
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'vue/no-v-html': 'warn',
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'vue/order-in-components': 'warn',
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'vue/this-in-template': 'warn'

‎lib/configs/vue3-recommended.js‎

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rules: {
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'vue/attributes-order': 'warn',
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'vue/component-tags-order': 'warn',
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'vue/no-multiple-slot-args': 'warn',
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'vue/no-v-html': 'warn',
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'vue/order-in-components': 'warn',
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'vue/this-in-template': 'warn'

‎lib/index.js‎

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'no-irregular-whitespace': require('./rules/no-irregular-whitespace'),
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'no-lifecycle-after-await': require('./rules/no-lifecycle-after-await'),
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'no-multi-spaces': require('./rules/no-multi-spaces'),
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'no-multiple-slot-args': require('./rules/no-multiple-slot-args'),
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'no-multiple-template-root': require('./rules/no-multiple-template-root'),
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'no-mutating-props': require('./rules/no-mutating-props'),
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'no-parsing-error': require('./rules/no-parsing-error'),

‎lib/rules/no-multiple-slot-args.js‎

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/**
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* @author Yosuke Ota
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* See LICENSE file in root directory for full license.
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*/
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'use strict'
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// ------------------------------------------------------------------------------
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// Requirements
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// ------------------------------------------------------------------------------
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const utils = require('../utils')
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const { findVariable } = require('eslint-utils')
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/**
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* @typedef {import('vue-eslint-parser').AST.ESLintMemberExpression} MemberExpression
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* @typedef {import('vue-eslint-parser').AST.ESLintIdentifier} Identifier
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*/
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// ------------------------------------------------------------------------------
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// Rule Definition
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// ------------------------------------------------------------------------------
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module.exports = {
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meta: {
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type: 'problem',
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docs: {
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description: 'disallow to pass multiple arguments to scoped slots',
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categories: ['vue3-recommended', 'recommended'],
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url: 'https://eslint.vuejs.org/rules/no-multiple-slot-args.html'
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},
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fixable: null,
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schema: [],
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messages: {
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unexpected: 'Unexpected multiple arguments.',
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unexpectedSpread: 'Unexpected spread argument.'
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}
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},
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create(context) {
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/**
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* Verify the given node
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* @param {MemberExpression | Identifier} node The node to verify
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*/
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function verify(node) {
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const parent = node.parent
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if (
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parent.type === 'VariableDeclarator' &&
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parent.id.type === 'Identifier'
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) {
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// const foo = this.$scopedSlots.foo
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verifyReferences(parent.id)
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return
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}
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if (
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parent.type === 'AssignmentExpression' &&
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parent.right === node &&
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parent.left.type === 'Identifier'
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) {
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// foo = this.$scopedSlots.foo
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verifyReferences(parent.left)
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return
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}
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if (parent.type !== 'CallExpression' || parent.arguments.includes(node)) {
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return
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}
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if (!parent.arguments.length) {
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return
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}
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if (parent.arguments.length > 1) {
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context.report({
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node: parent.arguments[1],
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messageId: 'unexpected'
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})
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}
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if (parent.arguments[0].type === 'SpreadElement') {
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context.report({
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node: parent.arguments[0],
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messageId: 'unexpectedSpread'
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})
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}
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}
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/**
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* Verify the references of the given node.
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* @param {Identifier} node The node to verify
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*/
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function verifyReferences(node) {
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// @ts-ignore
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const variable = findVariable(context.getScope(), node)
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if (!variable) {
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return
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}
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for (const reference of variable.references) {
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if (!reference.isRead()) {
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continue
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}
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/** @type {Identifier} */
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const id = reference.identifier
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verify(id)
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}
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}
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return utils.defineVueVisitor(context, {
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/** @param {MemberExpression} node */
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MemberExpression(node) {
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const object = node.object
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if (object.type !== 'MemberExpression') {
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return
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}
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if (
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object.property.type !== 'Identifier' ||
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(object.property.name !== '$slots' &&
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object.property.name !== '$scopedSlots')
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) {
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return
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}
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if (!utils.isThis(object.object, context)) {
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return
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}
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verify(node)
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}
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})
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}
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}

‎tests/lib/rules/no-multiple-slot-args.js‎

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/**
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* @author Yosuke Ota
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* See LICENSE file in root directory for full license.
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*/
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'use strict'
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// ------------------------------------------------------------------------------
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// Requirements
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// ------------------------------------------------------------------------------
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const rule = require('../../../lib/rules/no-multiple-slot-args')
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const RuleTester = require('eslint').RuleTester
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// ------------------------------------------------------------------------------
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// Tests
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// ------------------------------------------------------------------------------
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const ruleTester = new RuleTester({
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parser: require.resolve('vue-eslint-parser'),
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parserOptions: { ecmaVersion: 2018, sourceType: 'module' }
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})
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ruleTester.run('no-multiple-slot-args', rule, {
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valid: [
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{
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filename: 'test.vue',
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code: `
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<script>
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export default {
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render (h) {
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var children = this.$scopedSlots.default()
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var children = this.$scopedSlots.foo(foo)
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const bar = this.$scopedSlots.bar
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bar(foo)
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}
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}
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</script>
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`
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},
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{
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filename: 'test.vue',
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code: `
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<script>
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export default {
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render (h) {
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unknown.$scopedSlots.default(foo, bar)
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}
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}
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</script>
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`
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},
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{
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filename: 'test.vue',
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code: `
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<script>
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export default {
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render (h) {
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// for Vue3
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var children = this.$slots.default()
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var children = this.$slots.foo(foo)
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const bar = this.$slots.bar
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bar(foo)
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}
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}
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</script>
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`
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},
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{
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filename: 'test.vue',
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code: `
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<script>
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export default {
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render (h) {
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this.$foo.default(foo, bar)
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}
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}
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</script>
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`
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}
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],
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invalid: [
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{
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filename: 'test.vue',
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code: `
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<script>
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export default {
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render (h) {
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this.$scopedSlots.default(foo, bar)
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this.$scopedSlots.foo(foo, bar)
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}
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}
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</script>
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`,
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errors: [
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{
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message: 'Unexpected multiple arguments.',
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line: 5,
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column: 42,
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endLine: 5,
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endColumn: 45
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},
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{
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message: 'Unexpected multiple arguments.',
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line: 6,
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column: 38,
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endLine: 6,
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endColumn: 41
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}
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]
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},
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{
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filename: 'test.vue',
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code: `
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<script>
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export default {
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render (h) {
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let children
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this.$scopedSlots.default(foo, { bar })
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children = this.$scopedSlots.foo
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if (children) children(...foo)
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}
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}
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</script>
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`,
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errors: [
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{
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message: 'Unexpected multiple arguments.',
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line: 7,
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column: 42,
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endLine: 7,
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endColumn: 49
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},
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{
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message: 'Unexpected spread argument.',
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line: 10,
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column: 34,
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endLine: 10,
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endColumn: 40
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}
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]
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},
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{
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filename: 'test.vue',
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code: `
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<script>
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export default {
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render (h) {
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// for Vue3
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this.$slots.default(foo, bar)
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this.$slots.foo(foo, bar)
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}
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}
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</script>
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`,
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errors: [
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'Unexpected multiple arguments.',
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'Unexpected multiple arguments.'
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]
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}
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]
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})

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