Jeremy Hewett jeremyhewett
jeremyhewett
/ Deserialized.d.ts
Last active
January 27, 2026 02:12
A Typescript generic to describe any object (or primitive) that has gone through JSON serialization and deserialization. Using JSON.stringify to serialize an object and then using JSON.parse to deserialize it will produce a result that can differ from the original in many ways. For instance, any function properties will be removed, any Date prop…
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| type Deserialized<T> = | |
| unknown extends T ? unknown : | |
| T extends JSONPrimitive ? T : | |
| T extends { toJSON: () => infer R } ? Deserialized<R> : | |
| T extends Array<infer U> ? Deserialized<U>[] : | |
| T extends object ? DeserializedObject<T> : | |
| never; | |
| type DeserializedObject<T extends object> = { | |
| [K in keyof T as T[K] extends NotAssignableToJson ? never : K]: Deserialized<T[K]>; |