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83 lines
2.2 KiB
83 lines
2.2 KiB
/**
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* @fileoverview Rule to
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* @author Toru Nagashima
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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/**
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* Gets the variable object of `arguments` which is defined implicitly.
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* @param {escope.Scope} scope - A scope to get.
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* @returns {escope.Variable} The found variable object.
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*/
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function getVariableOfArguments(scope) {
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var variables = scope.variables;
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for (var i = 0; i < variables.length; ++i) {
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var variable = variables[i];
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if (variable.name === "arguments") {
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// If there was a parameter which is named "arguments", the implicit "arguments" is not defined.
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// So does fast return with null.
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return (variable.identifiers.length === 0) ? variable : null;
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}
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}
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/* istanbul ignore next : unreachable */
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return null;
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}
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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docs: {
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description: "require rest parameters instead of `arguments`",
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category: "ECMAScript 6",
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recommended: false
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},
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schema: []
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},
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create: function(context) {
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/**
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* Reports a given reference.
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*
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* @param {escope.Reference} reference - A reference to report.
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* @returns {void}
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*/
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function report(reference) {
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context.report({
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node: reference.identifier,
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message: "Use the rest parameters instead of 'arguments'."
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});
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}
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/**
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* Reports references of the implicit `arguments` variable if exist.
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*
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* @returns {void}
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*/
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function checkForArguments() {
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var argumentsVar = getVariableOfArguments(context.getScope());
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if (argumentsVar) {
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argumentsVar.references.forEach(report);
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}
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}
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return {
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FunctionDeclaration: checkForArguments,
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FunctionExpression: checkForArguments
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};
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}
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};
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