Function assertStrictEquals

assert/strict_equals.ts:32–68

(
  actual: unknown,
  expected: T,
  msg?: string,
)

 * @param msg The optional message to display if the assertion fails.
 */
export function assertStrictEquals<T>(
  actual: unknown,
  expected: T,
  msg?: string,
): asserts actual is T {
  if (Object.is(actual, expected)) {
    return;
  }

  const msgSuffix = msg ? `: ${msg}` : ".";
  let message: string;

  const actualString = format(actual);
  const expectedString = format(expected);

  if (actualString === expectedString) {
    const withOffset = actualString
      .split("\n")
      .map((l) => `    ${l}`)
      .join("\n");
    message =
      `Values have the same structure but are not reference-equal${msgSuffix}\n\n${
        red(withOffset)
      }\n`;
  } else {
    const stringDiff = (typeof actual === "string") &&
      (typeof expected === "string");
    const diffResult = stringDiff
      ? diffStr(actual as string, expected as string)
      : diff(actualString.split("\n"), expectedString.split("\n"));
    const diffMsg = buildMessage(diffResult, { stringDiff }, arguments[3])
      .join("\n");
    message = `Values are not strictly equal${msgSuffix}\n${diffMsg}`;
  }

  throw new AssertionError(message);
}