56 lines
1.1 KiB
JavaScript
56 lines
1.1 KiB
JavaScript
function isFreezable(object) {
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if (object === null) return false;
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return Array.isArray(object) ||
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typeof object === 'object';
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}
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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];
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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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/**
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* Deeply freeze a plain javascript object.
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*
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* If `process.env.NODE_ENV === 'production'`, this returns the original object
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* without freezing.
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*
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* Or if `process.env.UPDEEP_MODE === 'dangerously_never_freeze'`, this returns the original object
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* without freezing.
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*
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* @function
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* @sig a -> a
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* @param {object} object Object to freeze.
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* @return {object} Frozen object, unless in production, then the same object.
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*/
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function freeze(object) {
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if (process.env.NODE_ENV === 'production') {
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return object;
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}
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if (process.env.UPDEEP_MODE === 'dangerously_never_freeze') {
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return object;
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}
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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;
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