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tiny-invariant.flow.js	306 B	-rw-r--r--
tiny-invariant.ts	1.8 KB	-rw-r--r--

Code Editor : tiny-invariant.ts

const isProduction: boolean = process.env.NODE_ENV === 'production';
const prefix: string = 'Invariant failed';

/**
 * `invariant` is used to [assert](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html#assertion-functions) that the `condition` is [truthy](https://github.com/getify/You-Dont-Know-JS/blob/bdbe570600d4e1107d0b131787903ca1c9ec8140/up%20%26%20going/ch2.md#truthy--falsy).
 *
 * 💥 `invariant` will `throw` an `Error` if the `condition` is [falsey](https://github.com/getify/You-Dont-Know-JS/blob/bdbe570600d4e1107d0b131787903ca1c9ec8140/up%20%26%20going/ch2.md#truthy--falsy)
 *
 * 🤏 `message`s are not displayed in production environments to help keep bundles small
 *
 * @example
 *
 * ```ts
 * const value: Person | null = { name: 'Alex' };
 * invariant(value, 'Expected value to be a person');
 * // type of `value`` has been narrowed to `Person`
 * ```
 */
export default function invariant(
  condition: any,
  // Not providing an inline default argument for message as the result is smaller
  /**
   * Can provide a string, or a function that returns a string for cases where
   * the message takes a fair amount of effort to compute
   */
  message?: string | (() => string),
): asserts condition {
  if (condition) {
    return;
  }
  // Condition not passed

// In production we strip the message but still throw
  if (isProduction) {
    throw new Error(prefix);
  }

// When not in production we allow the message to pass through
  // *This block will be removed in production builds*

const provided: string | undefined = typeof message === 'function' ? message() : message;

// Options:
  // 1. message provided: `${prefix}: ${provided}`
  // 2. message not provided: prefix
  const value: string = provided ? `${prefix}: ${provided}` : prefix;
  throw new Error(value);
}

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Code Editor : tiny-invariant.ts

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