Function assertInlineSnapshot

testing/unstable_snapshot.ts:218–272

(
  actual: unknown,
  expectedSnapshot: string,
  msgOrOpts?: string | InlineSnapshotOptions<unknown>,
)

  message?: string,
): void;
export function assertInlineSnapshot(
  actual: unknown,
  expectedSnapshot: string,
  msgOrOpts?: string | InlineSnapshotOptions<unknown>,
): void {
  const options = getOptions(msgOrOpts);
  const serializer = options.serializer ?? serialize;
  const actualSnapshot = serializer(actual);
  // TODO(WWRS): dedent expectedSnapshot to allow snapshots to look nicer

  if (equal(actualSnapshot, expectedSnapshot)) {
    return;
  }

  if (getIsUpdate(options)) {
    const origPrepareStackTrace = (Error as V8Error).prepareStackTrace;
    try {
      const stackCatcher = { stack: null as SnapshotUpdateRequest | null };
      (Error as V8Error).prepareStackTrace = (
        _err: Error,
        stack: CallSite[],
      ): SnapshotUpdateRequest | null => {
        const callerStackFrame = stack[0];
        if (!callerStackFrame || callerStackFrame.isEval()) return null;

        const fileName = callerStackFrame.getFileName();
        const lineNumber = callerStackFrame.getLineNumber();
        const columnNumber = callerStackFrame.getColumnNumber();
        if (fileName === null || lineNumber === null || columnNumber === null) {
          return null;
        }

        return {
          fileName,
          lineNumber,
          columnNumber,
          actualSnapshot,
        };
      };
      // Capture the stack that comes after this function.
      Error.captureStackTrace(stackCatcher, assertInlineSnapshot);
      // Forcibly access the stack, and note it down
      const request = stackCatcher.stack;
      if (request !== null) {
        updateRequests.push(request);
      }
    } finally {
      (Error as V8Error).prepareStackTrace = origPrepareStackTrace;
    }
  } else {
    throw new AssertionError(
      getSnapshotNotMatchMessage(actualSnapshot, expectedSnapshot, options),
    );
  }
}

/**
 * Create {@linkcode assertInlineSnapshot} function with the given options.