143 lines
3.9 KiB
JavaScript
143 lines
3.9 KiB
JavaScript
/**
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* @fileoverview Rule to flag use of duplicate keys in an object.
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* @author Ian Christian Myers
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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 astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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const GET_KIND = /^(?:init|get)$/u;
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const SET_KIND = /^(?:init|set)$/u;
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/**
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* The class which stores properties' information of an object.
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*/
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class ObjectInfo {
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/**
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* @param {ObjectInfo|null} upper The information of the outer object.
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* @param {ASTNode} node The ObjectExpression node of this information.
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*/
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constructor(upper, node) {
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this.upper = upper;
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this.node = node;
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this.properties = new Map();
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}
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/**
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* Gets the information of the given Property node.
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* @param {ASTNode} node The Property node to get.
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* @returns {{get: boolean, set: boolean}} The information of the property.
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*/
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getPropertyInfo(node) {
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const name = astUtils.getStaticPropertyName(node);
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if (!this.properties.has(name)) {
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this.properties.set(name, { get: false, set: false });
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}
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return this.properties.get(name);
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}
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/**
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* Checks whether the given property has been defined already or not.
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* @param {ASTNode} node The Property node to check.
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* @returns {boolean} `true` if the property has been defined.
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*/
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isPropertyDefined(node) {
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const entry = this.getPropertyInfo(node);
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return (
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(GET_KIND.test(node.kind) && entry.get) ||
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(SET_KIND.test(node.kind) && entry.set)
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);
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}
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/**
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* Defines the given property.
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* @param {ASTNode} node The Property node to define.
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* @returns {void}
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*/
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defineProperty(node) {
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const entry = this.getPropertyInfo(node);
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if (GET_KIND.test(node.kind)) {
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entry.get = true;
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}
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if (SET_KIND.test(node.kind)) {
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entry.set = true;
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}
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}
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}
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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/** @type {import('../shared/types').Rule} */
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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 duplicate keys in object literals",
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recommended: true,
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url: "https://eslint.org/docs/latest/rules/no-dupe-keys"
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},
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schema: [],
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messages: {
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unexpected: "Duplicate key '{{name}}'."
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}
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},
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create(context) {
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let info = null;
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return {
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ObjectExpression(node) {
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info = new ObjectInfo(info, node);
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},
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"ObjectExpression:exit"() {
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info = info.upper;
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},
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Property(node) {
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const name = astUtils.getStaticPropertyName(node);
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// Skip destructuring.
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if (node.parent.type !== "ObjectExpression") {
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return;
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}
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// Skip if the name is not static.
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if (name === null) {
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return;
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}
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// Reports if the name is defined already.
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if (info.isPropertyDefined(node)) {
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context.report({
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node: info.node,
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loc: node.key.loc,
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messageId: "unexpected",
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data: { name }
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});
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}
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// Update info.
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info.defineProperty(node);
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}
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};
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}
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};
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