Function invariant

index.ts:12–20

(condition: boolean, message: () => string)

const isProduction = typeof process === 'object' && process.env.NODE_ENV === 'production';
export function invariant(condition: boolean, message: () => string) {
  if (!condition) {
    /* istanbul ignore next */
    if (isProduction) {
      throw new Error('Invariant failed');
    }
    throw new Error(message());
  }
}

const hasOwnProperty = Object.prototype.hasOwnProperty;
const splice = Array.prototype.splice;