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/**
* @fileoverview Disallow using Date for timing in performance sensitive code
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
"use strict";
module.exports = {
meta: {
docs: {
url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/avoid-Date-timing.html",
},
messages: {
usePerfNow:
"use performance.now() instead of Date.now() for timing measurements",
},
schema: [],
type: "problem",
},
create(context) {
return {
CallExpression(node) {
let callee = node.callee;
if (
callee.type !== "MemberExpression" ||
callee.object.type !== "Identifier" ||
callee.object.name !== "Date" ||
callee.property.type !== "Identifier" ||
callee.property.name !== "now"
) {
return;
}
context.report({
node,
messageId: "usePerfNow",
});
},
NewExpression(node) {
let callee = node.callee;
if (
callee.type !== "Identifier" ||
callee.name !== "Date" ||
node.arguments.length
) {
return;
}
context.report({
node,
messageId: "usePerfNow",
});
},
};
},
};
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