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New: Add
vue/no-ref-as-operand
rule (#1065)
* Add no-ref-as-operand rule * update * Add testcases * update * Fixed testcases * update doc
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--- | ||
pageClass: rule-details | ||
sidebarDepth: 0 | ||
title: vue/no-ref-as-operand | ||
description: disallow use of value wrapped by `ref()` (Composition API) as an operand | ||
--- | ||
# vue/no-ref-as-operand | ||
> disallow use of value wrapped by `ref()` (Composition API) as an operand | ||
## :book: Rule Details | ||
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This rule reports cases where a ref is used incorrectly as an operand. | ||
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<eslint-code-block :rules="{'vue/no-ref-as-operand': ['error']}"> | ||
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```vue | ||
<script> | ||
import { ref } from 'vue' | ||
export default { | ||
setup () { | ||
const count = ref(0) | ||
const ok = ref(true) | ||
/* ✓ GOOD */ | ||
count.value++ | ||
count.value + 1 | ||
1 + count.value | ||
var msg = ok.value ? 'yes' : 'no' | ||
/* ✗ BAD */ | ||
count++ | ||
count + 1 | ||
1 + count | ||
var msg = ok ? 'yes' : 'no' | ||
return { | ||
count | ||
} | ||
} | ||
} | ||
</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-ref-as-operand.js) | ||
- [Test source](https://github.com/vuejs/eslint-plugin-vue/blob/master/tests/lib/rules/no-ref-as-operand.js) |
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/** | ||
* @author Yosuke Ota | ||
* See LICENSE file in root directory for full license. | ||
*/ | ||
'use strict' | ||
const { ReferenceTracker, findVariable } = require('eslint-utils') | ||
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module.exports = { | ||
meta: { | ||
type: 'suggestion', | ||
docs: { | ||
description: 'disallow use of value wrapped by `ref()` (Composition API) as an operand', | ||
category: undefined, | ||
url: 'https://eslint.vuejs.org/rules/no-ref-as-operand.html' | ||
}, | ||
fixable: null, | ||
schema: [], | ||
messages: { | ||
requireDotValue: 'Must use `.value` to read or write the value wrapped by `ref()`.' | ||
} | ||
}, | ||
create (context) { | ||
const refReferenceIds = new Map() | ||
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function reportIfRefWrapped (node) { | ||
if (!refReferenceIds.has(node)) { | ||
return | ||
} | ||
context.report({ | ||
node, | ||
messageId: 'requireDotValue' | ||
}) | ||
} | ||
return { | ||
'Program' () { | ||
const tracker = new ReferenceTracker(context.getScope()) | ||
const traceMap = { | ||
vue: { | ||
[ReferenceTracker.ESM]: true, | ||
ref: { | ||
[ReferenceTracker.CALL]: true | ||
} | ||
} | ||
} | ||
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for (const { node } of tracker.iterateEsmReferences(traceMap)) { | ||
const variableDeclarator = node.parent | ||
if ( | ||
!variableDeclarator || | ||
variableDeclarator.type !== 'VariableDeclarator' || | ||
variableDeclarator.id.type !== 'Identifier' | ||
) { | ||
continue | ||
} | ||
const variable = findVariable(context.getScope(), variableDeclarator.id) | ||
if (!variable) { | ||
continue | ||
} | ||
const variableDeclaration = ( | ||
variableDeclarator.parent && | ||
variableDeclarator.parent.type === 'VariableDeclaration' && | ||
variableDeclarator.parent | ||
) || null | ||
for (const reference of variable.references) { | ||
if (!reference.isRead()) { | ||
continue | ||
} | ||
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refReferenceIds.set(reference.identifier, { | ||
variableDeclarator, | ||
variableDeclaration | ||
}) | ||
} | ||
} | ||
}, | ||
// if (refValue) | ||
'IfStatement>Identifier' (node) { | ||
reportIfRefWrapped(node) | ||
}, | ||
// switch (refValue) | ||
'SwitchStatement>Identifier' (node) { | ||
reportIfRefWrapped(node) | ||
}, | ||
// -refValue, +refValue, !refValue, ~refValue, typeof refValue | ||
'UnaryExpression>Identifier' (node) { | ||
reportIfRefWrapped(node) | ||
}, | ||
// refValue++, refValue-- | ||
'UpdateExpression>Identifier' (node) { | ||
reportIfRefWrapped(node) | ||
}, | ||
// refValue+1, refValue-1 | ||
'BinaryExpression>Identifier' (node) { | ||
reportIfRefWrapped(node) | ||
}, | ||
// refValue+=1, refValue-=1, foo+=refValue, foo-=refValue | ||
'AssignmentExpression>Identifier' (node) { | ||
reportIfRefWrapped(node) | ||
}, | ||
// refValue || other, refValue && other. ignore: other || refValue | ||
'LogicalExpression>Identifier' (node) { | ||
if (node.parent.left !== node) { | ||
return | ||
} | ||
// Report only constants. | ||
const info = refReferenceIds.get(node) | ||
if (!info) { | ||
return | ||
} | ||
if (!info.variableDeclaration || info.variableDeclaration.kind !== 'const') { | ||
return | ||
} | ||
reportIfRefWrapped(node) | ||
}, | ||
// refValue ? x : y | ||
'ConditionalExpression>Identifier' (node) { | ||
if (node.parent.test !== node) { | ||
return | ||
} | ||
reportIfRefWrapped(node) | ||
} | ||
} | ||
} | ||
} |
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