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Provide hasOwn polyfill configuration option. #1351

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Provide hasOwn polyfill configuration option. #1351

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b919bb0
Provide hasOwn polyfill configuration option.
dpvc Sep 10, 2025
5651923
Make the polyfill opt-out rather than opt-in
dpvc Sep 15, 2025
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10 changes: 10 additions & 0 deletions components/mjs/startup/hasown.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
import {MathJax} from '#js/components/global.js';

if (!Object.hasOwn && MathJax.config.startup.polyfillHasOwn) {
Object.hasOwn = function (el, prop) {
if (typeof el === 'undefined' || el === null) {
throw new TypeError('Cannot convert undefined or null to object');
}
return Object.prototype.hasOwnProperty.call(Object(el), prop);
}
}
1 change: 1 addition & 0 deletions components/mjs/startup/init.js
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
import './hasown.js';
import './lib/startup.js';

import {combineDefaults} from '#js/components/global.js';
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1 change: 1 addition & 0 deletions ts/components/startup.ts
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Expand Up @@ -620,6 +620,7 @@ if (typeof MathJax._.startup === 'undefined') {
typeset: true,
ready: Startup.defaultReady.bind(Startup),
pageReady: Startup.defaultPageReady.bind(Startup),
polyfillHasOwn: true,
});
combineWithMathJax({
startup: Startup,
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