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/**
* @fileoverview Disallow shadowing of NaN, undefined, and Infinity (ES5 section 15.1.1)
* @author Michael Ficarra
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "disallow identifiers from shadowing restricted names",
category: "Variables",
recommended: false
},
schema: []
},
create(context) {
const RESTRICTED = ["undefined", "NaN", "Infinity", "arguments", "eval"];
/**
* Check if the node name is present inside the restricted list
* @param {ASTNode} id id to evaluate
* @returns {void}
* @private
*/
function checkForViolation(id) {
if (RESTRICTED.indexOf(id.name) > -1) {
context.report({
node: id,
message: "Shadowing of global property '{{idName}}'.",
data: {
idName: id.name
}
});
}
}
return {
VariableDeclarator(node) {
checkForViolation(node.id);
},
ArrowFunctionExpression(node) {
[].map.call(node.params, checkForViolation);
},
FunctionExpression(node) {
if (node.id) {
checkForViolation(node.id);
}
[].map.call(node.params, checkForViolation);
},
FunctionDeclaration(node) {
if (node.id) {
checkForViolation(node.id);
[].map.call(node.params, checkForViolation);
}
},
CatchClause(node) {
checkForViolation(node.param);
}
};
}
};
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