/**
Matches a JSON object.

This type can be useful to enforce some input to be JSON-compatible or as a super-type to be extended from. Don't use this as a direct return type as the user would have to double-cast it: `jsonObject as unknown as CustomResponse`. Instead, you could extend your CustomResponse type from it to ensure your type only uses JSON-compatible types: `interface CustomResponse extends JsonObject { … }`.

@category JSON
*/
type JsonObject = {[Key in string]: JsonValue} & {[Key in string]?: JsonValue | undefined};

/**
Matches a JSON array.

@category JSON
*/
type JsonArray = JsonValue[] | readonly JsonValue[];

/**
Matches any valid JSON primitive value.

@category JSON
*/
type JsonPrimitive = string | number | boolean | null;

/**
Matches any valid JSON value.

@see `Jsonify` if you need to transform a type to one that is assignable to `JsonValue`.

@category JSON
*/
type JsonValue = JsonPrimitive | JsonObject | JsonArray;

declare global {
	// eslint-disable-next-line @typescript-eslint/consistent-type-definitions -- It has to be an `interface` so that it can be merged.
	interface SymbolConstructor {
		readonly observable: symbol;
	}
}

export type { JsonValue as J };