Created
August 29, 2024 07:42
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typesafe objectEntries, objectFromEntries
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| /** | |
| * Utility type to make complex types more readable in tooltips and error messages. | |
| */ | |
| type Prettify<T> = { | |
| [K in keyof T]: T[K]; | |
| } & {}; | |
| type ObjectEntry<T extends object> = Prettify<{ [K in keyof T]: [K, T[K]] }[keyof T]>; | |
| type FromEntries<T extends Array<[PropertyKey, unknown]>> = { | |
| [K in T[number][0]]: Extract<T[number], [K, unknown]>[1] | |
| }; | |
| /** | |
| * Returns an array of key-value pairs from an object. | |
| * @param object The object to convert to entries. | |
| * @returns An array of key-value pairs. | |
| */ | |
| export function objectEntries<T extends object>( | |
| object: T | |
| ) { | |
| return Object.entries(object) as Array<ObjectEntry<T>>; | |
| } | |
| /** | |
| * Creates an object from an array of key-value pairs. | |
| * @param entries An array of key-value pairs to convert to an object. | |
| * @returns An object created from the key-value pairs. | |
| */ | |
| export function objectFromEntries<T extends Array<[PropertyKey, unknown]>>( | |
| entries: T | |
| ) { | |
| return Object.fromEntries(entries) as Prettify<FromEntries<T>>; | |
| } | |
| // Example usage | |
| const sampleObject = { alpha: 1, beta: "hello", gamma: true }; | |
| const entryArray = objectEntries(sampleObject); | |
| // entryArray type: [string, string | number | boolean][] | |
| const reconstructedObject = objectFromEntries(entryArray); | |
| // reconstructedObject type: { alpha: number; beta: string; gamma: boolean } |
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