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/**
* @fileoverview Rule to flag use of console object
* @author Nicholas C. Zakas
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const astUtils = require("../util/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "suggestion",
docs: {
description: "disallow the use of `console`",
category: "Possible Errors",
recommended: true,
url: "https://eslint.org/docs/rules/no-console"
},
schema: [
{
type: "object",
properties: {
allow: {
type: "array",
items: {
type: "string"
},
minItems: 1,
uniqueItems: true
}
},
additionalProperties: false
}
],
messages: {
unexpected: "Unexpected console statement."
}
},
create(context) {
const options = context.options[0] || {};
const allowed = options.allow || [];
/**
* Checks whether the given reference is 'console' or not.
*
* @param {eslint-scope.Reference} reference - The reference to check.
* @returns {boolean} `true` if the reference is 'console'.
*/
function isConsole(reference) {
const id = reference.identifier;
return id && id.name === "console";
}
/**
* Checks whether the property name of the given MemberExpression node
* is allowed by options or not.
*
* @param {ASTNode} node - The MemberExpression node to check.
* @returns {boolean} `true` if the property name of the node is allowed.
*/
function isAllowed(node) {
const propertyName = astUtils.getStaticPropertyName(node);
return propertyName && allowed.indexOf(propertyName) !== -1;
}
/**
* Checks whether the given reference is a member access which is not
* allowed by options or not.
*
* @param {eslint-scope.Reference} reference - The reference to check.
* @returns {boolean} `true` if the reference is a member access which
* is not allowed by options.
*/
function isMemberAccessExceptAllowed(reference) {
const node = reference.identifier;
const parent = node.parent;
return (
parent.type === "MemberExpression" &&
parent.object === node &&
!isAllowed(parent)
);
}
/**
* Reports the given reference as a violation.
*
* @param {eslint-scope.Reference} reference - The reference to report.
* @returns {void}
*/
function report(reference) {
const node = reference.identifier.parent;
context.report({
node,
loc: node.loc,
messageId: "unexpected"
});
}
return {
"Program:exit"() {
const scope = context.getScope();
const consoleVar = astUtils.getVariableByName(scope, "console");
const shadowed = consoleVar && consoleVar.defs.length > 0;
/*
* 'scope.through' includes all references to undefined
* variables. If the variable 'console' is not defined, it uses
* 'scope.through'.
*/
const references = consoleVar
? consoleVar.references
: scope.through.filter(isConsole);
if (!shadowed) {
references
.filter(isMemberAccessExceptAllowed)
.forEach(report);
}
}
};
}
};