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/** * @fileoverview A rule to disallow duplicate name in class members. * @author Toru Nagashima */ "use strict"; const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "problem", docs: { description: "Disallow duplicate class members", recommended: true, url: "https://eslint.org/docs/latest/rules/no-dupe-class-members" }, schema: [], messages: { unexpected: "Duplicate name '{{name}}'." } }, create(context) { let stack = []; /** * Gets state of a given member name. * @param {string} name A name of a member. * @param {boolean} isStatic A flag which specifies that is a static member. * @returns {Object} A state of a given member name. * - retv.init {boolean} A flag which shows the name is declared as normal member. * - retv.get {boolean} A flag which shows the name is declared as getter. * - retv.set {boolean} A flag which shows the name is declared as setter. */ function getState(name, isStatic) { const stateMap = stack[stack.length - 1]; const key = `$${name}`; // to avoid "__proto__". if (!stateMap[key]) { stateMap[key] = { nonStatic: { init: false, get: false, set: false }, static: { init: false, get: false, set: false } }; } return stateMap[key][isStatic ? "static" : "nonStatic"]; } return { // Initializes the stack of state of member declarations. Program() { stack = []; }, // Initializes state of member declarations for the class. ClassBody() { stack.push(Object.create(null)); }, // Disposes the state for the class. "ClassBody:exit"() { stack.pop(); }, // Reports the node if its name has been declared already. "MethodDefinition, PropertyDefinition"(node) { const name = astUtils.getStaticPropertyName(node); const kind = node.type === "MethodDefinition" ? node.kind : "field"; if (name === null || kind === "constructor") { return; } const state = getState(name, node.static); let isDuplicate = false; if (kind === "get") { isDuplicate = (state.init || state.get); state.get = true; } else if (kind === "set") { isDuplicate = (state.init || state.set); state.set = true; } else { isDuplicate = (state.init || state.get || state.set); state.init = true; } if (isDuplicate) { context.report({ node, messageId: "unexpected", data: { name } }); } } }; } };