Global Utilities #Assign and #Object

(1) assign.ts

export function define<T extends {}>(source: T, ...sources: any[]): T {
	return Object.assign(source, ...sources) as T;
}

export function assign<T extends {}>(...sources: any[]): T {
	return Object.assign({}, ...sources) as T;
}

export function sureAssign<T>(
	value: T | undefined,
	message?: string,
): T | never {
	if (typeof value === 'undefined') {
		throw new ReferenceError(message);
	}

	return value;
}

type OmitExtended<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;

export function omit<T, K extends keyof T = keyof T>(
	object: T,
	properties: K[],
): OmitExtended<T, K> {
	const result = { ...object } as any;
	for (const property of properties) {
		delete result[property];
	}
	return result;
}

export default { sureAssign, define, assign, omit };