3c27e3ee73
This commit adds the ThreadSafeDevToolsUtils module for utilities that are guaranteed to work off the main thread. It also makes DevToolsUtils re-export the thread-safe utilities. This is similar to ChromeUtils and ThreadSafeChromeUtils webidl interfaces.
36 lines
1.1 KiB
JavaScript
36 lines
1.1 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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/**
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* General utilities used throughout devtools that can also be used in
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* workers.
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*/
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/**
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* Immutably reduce the given `...objs` into one object. The reduction is
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* applied from left to right, so `immutableUpdate({ a: 1 }, { a: 2 })` will
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* result in `{ a: 2 }`. The resulting object is frozen.
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*
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* Example usage:
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*
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* const original = { foo: 1, bar: 2, baz: 3 };
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* const modified = immutableUpdate(original, { baz: 0, bang: 4 });
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*
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* // We get the new object that we expect...
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* assert(modified.baz === 0);
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* assert(modified.bang === 4);
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*
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* // However, the original is not modified.
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* assert(original.baz === 2);
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* assert(original.bang === undefined);
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*
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* @param {...Object} ...objs
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* @returns {Object}
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*/
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exports.immutableUpdate = function (...objs) {
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return Object.freeze(Object.assign({}, ...objs));
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};
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