84 lines
2.0 KiB
JavaScript
84 lines
2.0 KiB
JavaScript
'use strict';
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const {isNodeMatches} = require('./utils/is-node-matches.js');
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const {isMethodCall} = require('./ast/index.js');
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const {removeMethodCall} = require('./fix/index.js');
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const MESSAGE_ID = 'prefer-array-flat-map';
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const messages = {
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[MESSAGE_ID]: 'Prefer `.flatMap(…)` over `.map(…).flat()`.',
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};
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const ignored = ['React.Children', 'Children'];
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/** @param {import('eslint').Rule.RuleContext} context */
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const create = context => ({
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CallExpression(callExpression) {
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if (!(
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isMethodCall(callExpression, {
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method: 'flat',
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optionalCall: false,
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optionalMember: false,
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})
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&& (
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callExpression.arguments.length === 0
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|| (
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callExpression.arguments.length === 1
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&& callExpression.arguments[0].type === 'Literal'
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&& callExpression.arguments[0].raw === '1'
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)
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)
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&& isMethodCall(callExpression.callee.object, {
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method: 'map',
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optionalCall: false,
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optionalMember: false,
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})
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)) {
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return;
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}
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const flatCallExpression = callExpression;
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const mapCallExpression = flatCallExpression.callee.object;
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if (isNodeMatches(mapCallExpression.callee.object, ignored)) {
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return;
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}
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const {sourceCode} = context;
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const mapProperty = mapCallExpression.callee.property;
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return {
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node: flatCallExpression,
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loc: {start: mapProperty.loc.start, end: flatCallExpression.loc.end},
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messageId: MESSAGE_ID,
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* fix(fixer) {
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// Removes:
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// map(…).flat();
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// ^^^^^^^
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// (map(…)).flat();
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// ^^^^^^^
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yield * removeMethodCall(fixer, flatCallExpression, sourceCode);
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// Renames:
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// map(…).flat();
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// ^^^
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// (map(…)).flat();
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// ^^^
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yield fixer.replaceText(mapProperty, 'flatMap');
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},
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};
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},
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});
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/** @type {import('eslint').Rule.RuleModule} */
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module.exports = {
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create,
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meta: {
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type: 'suggestion',
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docs: {
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description: 'Prefer `.flatMap(…)` over `.map(…).flat()`.',
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recommended: true,
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},
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fixable: 'code',
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messages,
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},
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};
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