45 lines
1.9 KiB
TypeScript
45 lines
1.9 KiB
TypeScript
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import {
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PositiveInfinity,
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NegativeInfinity,
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JsonPrimitive,
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TypedArray,
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JsonValue,
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} from "type-fest";
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import { NotJsonable } from "type-fest/source/jsonify";
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/**
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* Extracted from type-fest and extended with Jsonification of objects returned from `toJSON` methods.
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*/
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export type DeepJsonify<T> =
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// Check if there are any non-JSONable types represented in the union.
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// Note: The use of tuples in this first condition side-steps distributive conditional types
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// (see https://github.com/microsoft/TypeScript/issues/29368#issuecomment-453529532)
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[Extract<T, NotJsonable | bigint>] extends [never]
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? T extends PositiveInfinity | NegativeInfinity ? null
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: T extends JsonPrimitive
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? T // Primitive is acceptable
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: T extends number ? number
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: T extends string ? string
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: T extends boolean ? boolean
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: T extends Map<any, any> | Set<any> ? Record<string, unknown> // {}
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: T extends TypedArray ? Record<string, number>
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: T extends Array<infer U>
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? Array<DeepJsonify<U extends NotJsonable ? null : U>> // It's an array: recursive call for its children
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: T extends object
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? T extends { toJSON(): infer J }
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? (() => J) extends () => JsonValue // Is J assignable to JsonValue?
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? J // Then T is Jsonable and its Jsonable value is J
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: {[P in keyof J as P extends symbol
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? never
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: J[P] extends NotJsonable
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? never
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: P]: DeepJsonify<Required<J>[P]>;
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} // Not Jsonable because its toJSON() method does not return JsonValue
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: {[P in keyof T as P extends symbol
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? never
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: T[P] extends NotJsonable
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? never
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: P]: DeepJsonify<Required<T>[P]>} // It's an object: recursive call for its children
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: never // Otherwise any other non-object is removed
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: never; // Otherwise non-JSONable type union was found not empty
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