Function assertExists

assert/exists.ts:21–31

(
  actual: T,
  msg?: string,
)

 * @param msg The optional message to include in the error if the assertion fails.
 */
export function assertExists<T>(
  actual: T,
  msg?: string,
): asserts actual is NonNullable<T> {
  if (actual === undefined || actual === null) {
    const msgSuffix = msg ? `: ${msg}` : ".";
    msg =
      `Expected actual: "${actual}" to not be null or undefined${msgSuffix}`;
    throw new AssertionError(msg);
  }
}