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Fix: Fix false positives/negatives in require-meta-fixable rule
False positives fixed: * When `meta.fixable` uses a variable False negatives fixed: * When there's a fixer but `meta.fixable` = null * When there's a fixer but `meta.fixable` = undefined Also improves reporting location.
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‎docs/rules/require-meta-fixable.md

+4-21
Original file line numberDiff line numberDiff line change
@@ -2,19 +2,19 @@
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✔️ The `"extends": "plugin:eslint-plugin/recommended"` property in a configuration file enables this rule.
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5-
A fixable ESLint rule must have a valid `meta.fixable` property. A rule reports a problem with a `fix()` function but does not export a `meta.fixable` property is likely to cause an unexpected error.
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ESLint requires fixable rules to specify a valid `meta.fixable` property (with value `code` or `whitespace`).
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## Rule Details
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This rule aims to require ESLint rules to have a `meta.fixable` property if necessary.
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This rule aims to require fixable ESLint rules to have a valid `meta.fixable` property.
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Examples of **incorrect** code for this rule:
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```js
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/* eslint eslint-plugin/require-meta-fixable: "error" */
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module.exports = {
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meta: {},
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meta: {}, // missing `fixable` property
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create (context) {
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context.report({
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node,
@@ -44,20 +44,6 @@ module.exports = {
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};
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```
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```js
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/* eslint eslint-plugin/require-meta-fixable: "error" */
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module.exports = { create (context) {
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context.report({
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node,
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message: 'foo',
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fix (fixer) {
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return fixer.remove(node);
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},
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});
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} };
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```
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Examples of **correct** code for this rule:
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```js
@@ -91,10 +77,7 @@ module.exports = {
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};
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```
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## When Not To Use It
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If you do not plan to implement autofixable rules, you can turn off this rule.
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## Further Reading
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* [ESLint's autofix API](http://eslint.org/docs/developer-guide/working-with-rules#applying-fixes)
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* [ESLint's rule basics mentioning `meta.fixable`](https://eslint.org/docs/developer-guide/working-with-rules#rule-basics)

‎lib/rules/require-meta-fixable.js

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@@ -5,6 +5,7 @@
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'use strict';
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const { getStaticValue } = require('eslint-utils');
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const utils = require('../utils');
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// ------------------------------------------------------------------------------
@@ -20,6 +21,10 @@ module.exports = {
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recommended: true,
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},
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schema: [],
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messages: {
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invalid: '`meta.fixable` must be either `code`, `whitespace` or `null`.',
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missing: 'Fixable rules must export a `meta.fixable` property.'
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}
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},
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create (context) {
@@ -61,22 +66,28 @@ module.exports = {
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ruleInfo.meta.type === 'ObjectExpression' &&
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ruleInfo.meta.properties.find(prop => utils.getKeyName(prop) === 'fixable');
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if (metaFixableProp) {
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const VALID_VALUES = new Set(['code', 'whitespace', null, undefined]);
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const valueIsValid = metaFixableProp.value.type === 'Literal'
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? VALID_VALUES.has(metaFixableProp.value.value)
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// eslint-disable-next-line unicorn/no-nested-ternary
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: metaFixableProp.value.type === 'TemplateLiteral' && metaFixableProp.value.quasis.length === 1
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? VALID_VALUES.has(metaFixableProp.value.quasis[0].value.cooked)
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: metaFixableProp.value.type === 'Identifier' && metaFixableProp.value.name === 'undefined';
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if (metaFixableProp) {
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const staticValue = getStaticValue(metaFixableProp.value, context.getScope());
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if (!staticValue) {
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// Ignore non-static values since we can't determine what they look like.
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return;
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}
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if (!valueIsValid) {
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context.report({ node: metaFixableProp, message: '`meta.fixable` must be either `code`, `whitespace` or `null`.' });
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if (!['code', 'whitespace', null, undefined].includes(staticValue.value)) {
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// `fixable` property has an invalid value.
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context.report({ node: metaFixableProp.value, messageId: 'invalid' });
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return;
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}
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if (usesFixFunctions && !['code','whitespace'].includes(staticValue.value)) {
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// Rule is fixable but `fixable` property does not have a fixable value.
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context.report({ node: metaFixableProp.value, messageId: 'missing' });
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}
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} else if (!metaFixableProp && usesFixFunctions) {
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// Rule is fixable but is missing the `fixable` property.
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context.report({ node: ruleInfo.meta || ruleInfo.create, messageId: 'missing' });
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}
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} else if (usesFixFunctions) {
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context.report({ node: ruleInfo.create, message: 'Fixable rules must export a `meta.fixable` property.' });
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}
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},
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};
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},
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};

‎tests/lib/rules/require-meta-fixable.js

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@@ -12,9 +12,6 @@
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const rule = require('../../../lib/rules/require-meta-fixable');
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const RuleTester = require('eslint').RuleTester;
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const MISSING_ERROR = { message: 'Fixable rules must export a `meta.fixable` property.', type: 'FunctionExpression' };
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const INVALID_ERROR = { message: '`meta.fixable` must be either `code`, `whitespace` or `null`.', type: 'Property' };
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// ------------------------------------------------------------------------------
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// Tests
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// ------------------------------------------------------------------------------
@@ -37,6 +34,16 @@ ruleTester.run('require-meta-fixable', rule, {
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}
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};
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`,
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// Value in variable.
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`
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const fixable = 'code';
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module.exports = {
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meta: { fixable },
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create(context) {
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context.report({node, message, fix: foo});
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}
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};
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`,
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`
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module.exports = {
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meta: { fixable: 'whitespace' },
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}
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};
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`,
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// `fixable` uses variable but no static value available.
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`
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module.exports = {
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meta: { fixable: foo },
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create(context) { context.report({node, message, fix: foo}); }
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};
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`,
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`
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module.exports = {
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meta: {},
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create(context) { context.report({node, message, fix: foo}); }
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};
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`,
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errors: [MISSING_ERROR],
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errors: [{ messageId: 'missing', type: 'ObjectExpression' }],
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},
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{
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code: `
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module.exports = {
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create(context) { context.report({node, message, fix: foo}); }
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};
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`,
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errors: [{ messageId: 'missing', type: 'FunctionExpression' }],
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},
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{
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code: `
@@ -137,7 +159,7 @@ ruleTester.run('require-meta-fixable', rule, {
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create(context) { context.report(node, loc, message, data, fix); }
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};
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`,
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errors: [MISSING_ERROR],
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errors: [{ messageId: 'missing', type: 'ObjectExpression' }],
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},
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{
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code: `
@@ -146,7 +168,7 @@ ruleTester.run('require-meta-fixable', rule, {
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create(context) { context.report({node, message}); }
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};
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`,
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errors: [INVALID_ERROR],
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errors: [{ messageId: 'invalid', type: 'Literal' }],
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},
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{
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code: `
@@ -155,16 +177,35 @@ ruleTester.run('require-meta-fixable', rule, {
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create(context) { context.report({node, message, fix: foo}); }
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};
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`,
158-
errors: [INVALID_ERROR],
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errors: [{ messageId: 'invalid', type: 'Literal' }],
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},
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{
183+
code: `
184+
const fixable = 'invalid';
185+
module.exports = {
186+
meta: { fixable },
187+
create(context) { context.report({node, message, fix: foo}); }
188+
};
189+
`,
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errors: [{ messageId: 'invalid', type: 'Identifier' }],
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},
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{
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code: `
194+
module.exports = {
195+
meta: { fixable: null },
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create(context) { context.report({node, message, fix: foo}); }
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};
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`,
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errors: [{ messageId: 'missing', type: 'Literal' }],
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},
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{
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code: `
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module.exports = {
163-
meta: { fixable: foo },
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meta: { fixable: undefined },
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create(context) { context.report({node, message, fix: foo}); }
165206
};
166207
`,
167-
errors: [INVALID_ERROR],
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errors: [{ messageId: 'missing', type: 'Identifier' }],
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},
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],
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});

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