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42 lines
1.2 KiB
42 lines
1.2 KiB
5 years ago
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/**
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* Freezes the Promise global and prevents its reassignment.
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*/
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const deepFreeze = require('deep-freeze-strict')
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if (
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process.env.IN_TEST !== 'true' &&
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process.env.METAMASK_ENV !== 'test'
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) {
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freeze(global, 'Promise')
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}
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/**
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* Makes a key:value pair on a target object immutable, with limitations.
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* The key cannot be reassigned or deleted, and the value is recursively frozen
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* using Object.freeze.
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*
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* Because of JavaScript language limitations, this is does not mean that the
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* value is completely immutable. It is, however, better than nothing.
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*
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* @param {Object} target - The target object to freeze a property on.
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* @param {String} key - The key to freeze.
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* @param {any} [value] - The value to freeze, if different from the existing value on the target.
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* @param {boolean} [enumerable=true] - If given a value, whether the property is enumerable.
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*/
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function freeze (target, key, value, enumerable = true) {
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const opts = {
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configurable: false, writable: false,
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}
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if (value !== undefined) {
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opts.value = deepFreeze(value)
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opts.enumerable = enumerable
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} else {
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target[key] = deepFreeze(target[key])
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}
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Object.defineProperty(target, key, opts)
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}
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