64 lines
1.7 KiB
TypeScript
64 lines
1.7 KiB
TypeScript
// Copyright 2021 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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export type NullToUndefined<T> =
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Extract<T, null> extends never ? T : Exclude<T, null> | undefined;
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export type UndefinedToNull<T> =
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Extract<T, undefined> extends never ? T : Exclude<T, undefined> | null;
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export type ShallowUndefinedToNull<T extends { [key: string]: unknown }> = {
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[P in keyof T]: UndefinedToNull<T[P]>;
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};
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export function dropNull<T>(
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value: NonNullable<T> | null | undefined
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): T | undefined {
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// eslint-disable-next-line eqeqeq
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if (value === null) {
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return undefined;
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}
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return value;
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}
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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export function shallowDropNull<O extends { [key: string]: any }>(
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value: O | null | undefined
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):
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[Property in keyof O]: NullToUndefined<O[Property]>;
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}
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| undefined {
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if (value == null) {
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return undefined;
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}
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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const result: any = {};
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for (const [key, propertyValue] of Object.entries(value)) {
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result[key] = dropNull(propertyValue);
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}
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return result;
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}
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export function convertUndefinedToNull<T>(value: T | undefined): T | null {
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if (value === undefined) {
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return null;
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}
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return value;
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}
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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export function shallowConvertUndefinedToNull<T extends { [key: string]: any }>(
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obj: T
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): ShallowUndefinedToNull<T> {
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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const result: any = {};
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for (const [key, propertyValue] of Object.entries(obj)) {
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result[key] = convertUndefinedToNull(propertyValue);
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}
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return result;
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}
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