updeep-remeda/lib/freeze.js

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function isFreezable(object) {
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if (object === null) return false
if (object instanceof RegExp) return false
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if (object instanceof ArrayBuffer) return false
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return Array.isArray(object) || typeof object === 'object'
}
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function needsFreezing(object) {
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return isFreezable(object) && !Object.isFrozen(object)
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}
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function recur(object) {
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Object.freeze(object)
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Object.keys(object).forEach((key) => {
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const value = object[key]
if (needsFreezing(value)) {
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recur(value)
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}
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})
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return object
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}
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/**
* Deeply freeze a plain javascript object.
*
* If `process.env.NODE_ENV === 'production'`, this returns the original object
* without freezing.
*
* Or if `process.env.UPDEEP_MODE === 'dangerously_never_freeze'`, this returns the original object
* without freezing.
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*
* @function
* @sig a -> a
* @param {object} object Object to freeze.
* @return {object} Frozen object, unless in production, then the same object.
*/
function freeze(object) {
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if (process.env.NODE_ENV === 'production') {
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return object
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}
if (process.env.UPDEEP_MODE === 'dangerously_never_freeze') {
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return object
}
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if (needsFreezing(object)) {
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recur(object)
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}
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return object
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}
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export default freeze