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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| /** | ||
| * The `Serialize` type emulates the operation `JSON.parse(JSON.stringify(x))` done | ||
| * when passing the `data` to a `Job` in a `Worker`. | ||
| */ | ||
| export type Serialize<T> = | ||
| /** | ||
| * If the input is any then the output must as well be any | ||
| */ | ||
| IsAny<T> extends true | ||
| ? any | ||
| : /** | ||
| * Under the hood, JSON.stringify calls the `toJSON()` method on his parameter. | ||
| */ | ||
| T extends { toJSON(): infer U } | ||
| ? U extends JsonValue | ||
| ? U | ||
| : unknown | ||
| : /** | ||
| * Primitives | ||
| */ | ||
| T extends JsonPrimitive | ||
| ? T | ||
| : /** | ||
| * Primitive wrappers | ||
| */ | ||
| T extends String | ||
| ? string | ||
| : T extends Number | ||
| ? number | ||
| : T extends Boolean | ||
| ? boolean | ||
| : /** | ||
| * JSON.stringify returns always `{}` for a `Promise` | ||
| */ | ||
| T extends Promise<unknown> | ||
| ? '{}' | ||
| : /** | ||
| * Map | ||
| */ | ||
| T extends Map<unknown, unknown> | ||
| ? EmptyObject | ||
| : /** | ||
| * Set | ||
| */ | ||
| T extends Set<unknown> | ||
| ? EmptyObject | ||
| : /** | ||
| * Array views | ||
| */ | ||
| T extends TypedArray | ||
| ? Record<string, number> | ||
| : /** | ||
| * Some object can't be serialized, so we remove them. | ||
| */ | ||
| T extends NotJson | ||
| ? never | ||
| : /** | ||
| * Arrays | ||
| */ | ||
| T extends [] | ||
| ? [] | ||
| : T extends readonly [infer F, ...infer R] | ||
| ? [NeverToNull<Serialize<F>>, ...Serialize<R>] | ||
| : T extends readonly unknown[] | ||
| ? Array<NeverToNull<Serialize<T[number]>>> | ||
| : /** | ||
| * Objects | ||
| */ | ||
| T extends Record<keyof unknown, unknown> | ||
| ? Prettify<SerializeObject<T>> | ||
| : /** | ||
| * Unknown | ||
| */ | ||
| unknown extends T | ||
| ? unknown | ||
| : never; | ||
|
|
||
| /** | ||
| * Some utils. | ||
| */ | ||
|
|
||
| type NotJson = undefined | symbol | ((...args: any[]) => unknown); | ||
|
|
||
| // value is always not JSON => true | ||
| // value is always JSON => false | ||
| // value is somtimes JSON, sometimes not JSON => boolean | ||
| // note: cannot be inlined as logic requires union distribution | ||
| type ValueIsNotJson<T> = T extends NotJson ? true : false; | ||
|
|
||
| // note: remove optionality so that produced values are never `undefined`, | ||
| // only `true`, `false`, or `boolean` | ||
| type IsNotJson<T> = { [K in keyof T]-?: ValueIsNotJson<T[K]> }; | ||
|
|
||
| type SerializeValues<T> = { [K in keyof T]: Serialize<T[K]> }; | ||
|
|
||
| type SerializeObject<T extends Record<keyof unknown, unknown>> = | ||
| // required | ||
| { | ||
| [K in keyof T as unknown extends T[K] | ||
| ? never | ||
| : IsNotJson<T>[K] extends false | ||
| ? K | ||
| : never]: SerializeValues<T>[K]; | ||
| } & { | ||
| // optional | ||
| [K in keyof T as unknown extends T[K] | ||
| ? K | ||
| : // if the value is always JSON, then it's not optional | ||
| IsNotJson<T>[K] extends false | ||
| ? never | ||
| : // if the value is always not JSON, omit it entirely | ||
| IsNotJson<T>[K] extends true | ||
| ? never | ||
| : // if the value is mixed, then it's optional | ||
| K]?: SerializeValues<T>[K]; | ||
| }; | ||
|
|
||
| type JsonPrimitive = string | number | boolean | null; | ||
|
|
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| type JsonArray = JsonValue[] | readonly JsonValue[]; | ||
|
|
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| type JsonObject = { [K in string]: JsonValue } & { [K in string]?: JsonValue }; | ||
|
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| type JsonValue = JsonPrimitive | JsonObject | JsonArray; | ||
|
|
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| type TypedArray = | ||
| | Int8Array | ||
| | Uint8Array | ||
| | Uint8ClampedArray | ||
| | Int16Array | ||
| | Uint16Array | ||
| | Int32Array | ||
| | Uint32Array | ||
| | Float32Array | ||
| | Float64Array | ||
| | BigInt64Array | ||
| | BigUint64Array; | ||
|
|
||
| type Prettify<T> = { [K in keyof T]: T[K] } & {}; | ||
|
|
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| type NeverToNull<T> = [T] extends [never] ? null : T; | ||
|
|
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| declare const emptyObjectSymbol: unique symbol; | ||
| type EmptyObject = { [emptyObjectSymbol]?: never }; | ||
|
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| type IsAny<T> = 0 extends 1 & T ? true : false; |