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/** * @fileoverview Rule to * @author Toru Nagashima */ "use strict"; //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ /** * Gets the variable object of `arguments` which is defined implicitly. * @param {eslint-scope.Scope} scope A scope to get. * @returns {eslint-scope.Variable} The found variable object. */ function getVariableOfArguments(scope) { const variables = scope.variables; for (let i = 0; i < variables.length; ++i) { const variable = variables[i]; if (variable.name === "arguments") { /* * If there was a parameter which is named "arguments", the implicit "arguments" is not defined. * So does fast return with null. */ return (variable.identifiers.length === 0) ? variable : null; } } /* c8 ignore next */ return null; } /** * Checks if the given reference is not normal member access. * * - arguments .... true // not member access * - arguments[i] .... true // computed member access * - arguments[0] .... true // computed member access * - arguments.length .... false // normal member access * @param {eslint-scope.Reference} reference The reference to check. * @returns {boolean} `true` if the reference is not normal member access. */ function isNotNormalMemberAccess(reference) { const id = reference.identifier; const parent = id.parent; return !( parent.type === "MemberExpression" && parent.object === id && !parent.computed ); } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Require rest parameters instead of `arguments`", recommended: false, url: "https://eslint.org/docs/latest/rules/prefer-rest-params" }, schema: [], messages: { preferRestParams: "Use the rest parameters instead of 'arguments'." } }, create(context) { const sourceCode = context.sourceCode; /** * Reports a given reference. * @param {eslint-scope.Reference} reference A reference to report. * @returns {void} */ function report(reference) { context.report({ node: reference.identifier, loc: reference.identifier.loc, messageId: "preferRestParams" }); } /** * Reports references of the implicit `arguments` variable if exist. * @param {ASTNode} node The node representing the function. * @returns {void} */ function checkForArguments(node) { const argumentsVar = getVariableOfArguments(sourceCode.getScope(node)); if (argumentsVar) { argumentsVar .references .filter(isNotNormalMemberAccess) .forEach(report); } } return { "FunctionDeclaration:exit": checkForArguments, "FunctionExpression:exit": checkForArguments }; } };