@masknet/eslint-plugin/lib/rules/array/no-unneeded-flat-map.js

eslint plugin for masknet

import { isIdentifierFunction, isIdentifierName } from "../../node.js";
import { createRule } from "../../rule.js";
export default createRule({
    name: 'array/no-unneeded-flat-map',
    meta: {
        type: 'suggestion',
        fixable: 'code',
        docs: {
            description: 'Disallow `Array#flatMap((x) => x)` when simpler alternatives exist',
            recommended: 'stylistic',
        },
        schema: [],
        messages: {
            invalid: 'Disallow simple `Array#flatMap()` in array',
        },
    },
    defaultOptions: [],
    create(context) {
        return {
            CallExpression(node) {
                if (node.callee.type !== 'MemberExpression')
                    return;
                const isFlatMap = isIdentifierName(node.callee.property, 'flatMap');
                if (!isFlatMap || !isIdentifierFunction(node.arguments[0]))
                    return;
                const { property } = node.callee;
                context.report({
                    node,
                    messageId: 'invalid',
                    *fix(fixer) {
                        yield fixer.replaceText(property, 'flat');
                        yield* node.arguments.map((node) => fixer.remove(node));
                    },
                });
            },
        };
    },
});
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