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// @flow
const isProduction: boolean = process.env.NODE_ENV === 'production';
const prefix: string = 'Invariant failed';
// Throw an error if the condition fails
// Strip out error messages for production
// > Not providing an inline default argument for message as the result is smaller
export default function invariant(condition: mixed, message?: string) {
if (condition) {
return;
}
// Condition not passed
if (isProduction) {
// In production we strip the message but still throw
throw new Error(prefix);
} else {
// When not in production we allow the message to pass through
// *This block will be removed in production builds*
throw new Error(`${prefix}: ${message || ''}`);
}
}