Function invariant

packages/utils/src/misc.ts:104–108

(check: any, message: string, thing?: any)

}

export function invariant(check: any, message: string, thing?: any) {
  if (!check) {
    throw new Error(`Invariant failed: ${ message }${thing ? ` in '${thing}'` : ''}`);
  }
}

export function deprecate(fail: any, message: string, alterative?: string) {
  if (fail) {