132 lines
4 KiB
JavaScript
132 lines
4 KiB
JavaScript
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/**
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* @fileoverview Rule to flag use of console object
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* @author Nicholas C. Zakas
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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("../ast-utils");
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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: "disallow the use of `console`",
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category: "Possible Errors",
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recommended: true
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},
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schema: [
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{
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type: "object",
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properties: {
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allow: {
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type: "array",
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items: {
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type: "string"
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},
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minItems: 1,
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uniqueItems: true
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}
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},
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additionalProperties: false
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}
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]
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},
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create(context) {
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const options = context.options[0] || {};
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const allowed = options.allow || [];
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/**
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* Checks whether the given reference is 'console' or not.
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*
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* @param {eslint-scope.Reference} reference - The reference to check.
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* @returns {boolean} `true` if the reference is 'console'.
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*/
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function isConsole(reference) {
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const id = reference.identifier;
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return id && id.name === "console";
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}
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/**
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* Checks whether the property name of the given MemberExpression node
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* is allowed by options or not.
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*
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* @param {ASTNode} node - The MemberExpression node to check.
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* @returns {boolean} `true` if the property name of the node is allowed.
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*/
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function isAllowed(node) {
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const propertyName = astUtils.getStaticPropertyName(node);
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return propertyName && allowed.indexOf(propertyName) !== -1;
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}
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/**
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* Checks whether the given reference is a member access which is not
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* allowed by options or not.
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*
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* @param {eslint-scope.Reference} reference - The reference to check.
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* @returns {boolean} `true` if the reference is a member access which
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* is not allowed by options.
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*/
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function isMemberAccessExceptAllowed(reference) {
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const node = reference.identifier;
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const parent = node.parent;
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return (
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parent.type === "MemberExpression" &&
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parent.object === node &&
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!isAllowed(parent)
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);
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}
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/**
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* Reports the given reference as a violation.
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*
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* @param {eslint-scope.Reference} reference - The reference to report.
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* @returns {void}
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*/
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function report(reference) {
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const node = reference.identifier.parent;
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context.report({
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node,
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loc: node.loc,
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message: "Unexpected console statement."
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});
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}
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return {
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"Program:exit"() {
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const scope = context.getScope();
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const consoleVar = astUtils.getVariableByName(scope, "console");
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const shadowed = consoleVar && consoleVar.defs.length > 0;
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/*
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* 'scope.through' includes all references to undefined
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* variables. If the variable 'console' is not defined, it uses
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* 'scope.through'.
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*/
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const references = consoleVar
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? consoleVar.references
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: scope.through.filter(isConsole);
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if (!shadowed) {
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references
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.filter(isMemberAccessExceptAllowed)
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.forEach(report);
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}
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}
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};
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}
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};
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