/** * @fileoverview Rule to flag when using constructor for wrapper objects * @author Ilya Volodin */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const { getVariableByName } = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../types').Rule.RuleModule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Disallow `new` operators with the `String`, `Number`, and `Boolean` objects", recommended: false, url: "https://eslint.org/docs/latest/rules/no-new-wrappers", }, schema: [], messages: { noConstructor: "Do not use {{fn}} as a constructor.", }, }, create(context) { const { sourceCode } = context; return { NewExpression(node) { const wrapperObjects = ["String", "Number", "Boolean"]; const { name } = node.callee; if (wrapperObjects.includes(name)) { const variable = getVariableByName( sourceCode.getScope(node), name, ); if (variable && variable.identifiers.length === 0) { context.report({ node, messageId: "noConstructor", data: { fn: name }, }); } } }, }; }, };