global.d.ts

type NonFalsy<T> = T extends false | 0 | "" | null | undefined | 0n ? never : T;

interface Array<T> {
	includes(searchElement: unknown, fromIndex?: number): searchElement is T;
}

interface ReadonlyArray<T> {
	includes(searchElement: unknown, fromIndex?: number): searchElement is T;
}

interface Body {
	json(): Promise<unknown>;
}

interface Array<T> {
	filter(predicate: BooleanConstructor, thisArg?: unknown): NonFalsy<T>[];
}

interface ReadonlyArray<T> {
	filter(predicate: BooleanConstructor, thisArg?: unknown): NonFalsy<T>[];
}

interface ArrayConstructor {
	isArray(arg: unknown): arg is unknown[];
}

interface JSON {
	/**
	 * Converts a JavaScript Object Notation (JSON) string into an object.
	 * @param text A valid JSON string.
	 * @param reviver A function that transforms the results. This function is called for each member of the object.
	 * If a member contains nested objects, the nested objects are transformed before the parent object is.
	 */
	parse(text: string, reviver?: (this: unknown, key: string, value: unknown) => unknown): unknown;
}

interface Set<T> {
	has(value: unknown): value is T;
}