76 lines
1.9 KiB
TypeScript
76 lines
1.9 KiB
TypeScript
// https://gist.github.com/tkrotoff/a6baf96eb6b61b445a9142e5555511a0
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import type { Primitive } from "type-fest";
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type NullToUndefined<T> = T extends null
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? undefined
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: T extends Primitive | Function | Date | RegExp
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? T
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: T extends Array<infer U>
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? Array<NullToUndefined<U>>
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: T extends Map<infer K, infer V>
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? Map<K, NullToUndefined<V>>
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: T extends Set<infer U>
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? Set<NullToUndefined<U>>
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: T extends object
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? { [K in keyof T]: NullToUndefined<T[K]> }
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: unknown;
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type UndefinedToNull<T> = T extends undefined
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? null
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: T extends Primitive | Function | Date | RegExp
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? T
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: T extends Array<infer U>
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? Array<UndefinedToNull<U>>
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: T extends Map<infer K, infer V>
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? Map<K, UndefinedToNull<V>>
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: T extends Set<infer U>
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? Set<NullToUndefined<U>>
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: T extends object
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? { [K in keyof T]: UndefinedToNull<T[K]> }
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: unknown;
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function _nullToUndefined<T>(obj: T): NullToUndefined<T> {
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if (obj === null) {
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return undefined as any;
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}
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if (typeof obj === "object") {
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if (obj instanceof Map) {
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obj.forEach((value, key) => obj.set(key, _nullToUndefined(value)));
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} else {
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for (const key in obj) {
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obj[key] = _nullToUndefined(obj[key]) as any;
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}
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}
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}
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return obj as any;
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}
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function _undefinedToNull<T>(obj: T): UndefinedToNull<T> {
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if (obj === undefined) {
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return null as any;
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}
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if (typeof obj === "object") {
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if (obj instanceof Map) {
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obj.forEach((value, key) => obj.set(key, _undefinedToNull(value)));
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} else {
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for (const key in obj) {
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obj[key] = _undefinedToNull(obj[key]) as any;
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}
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}
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}
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return obj as any;
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}
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/**
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* Recursively converts all undefined values to null.
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*
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* @param obj object to convert
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* @returns a copy of the object with all its undefined values converted to null
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*/
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export function undefinedToNull<T>(obj: T) {
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return _undefinedToNull(structuredClone(obj));
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}
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