Fix issue with source maps

src/errors.test.ts

@@ -164,6 +164,42 @@ describe('wrapError', () => {
     });
   });
 
+  describe('if the original error has a length === 2', () => {
+    it('returns an error with cause', () => {
+      // Save original Error
+      const OriginalError = global.Error;
+
+      // Create a mock error with a cause
+      class MockError extends Error {
+        constructor(message: string, options: { cause?: Error } = {}) {
+          super(message);
+          this.cause = options.cause;
+        }
+
+        cause: Error | undefined;
+      }
+      // Set length to 2
+      Object.defineProperty(MockError, 'length', { value: 2 });
+
+      // Replace global Error with MockError
+      global.Error = MockError as unknown as ErrorConstructor;
+
+      // Define your original error and message
+      const originalError = new Error('original error');
+      const message = 'new error message';
+
+      // Call your function
+      const result = wrapError(originalError, message);
+
+      // Assert that the error has the expected properties
+      expect(result.message).toBe(message);
+      expect(result.cause).toBe(originalError);
+
+      // Restore the original Error constructor
+      global.Error = OriginalError;
+    });
+  });
+
   describe('if the original error is an object but not an Error instance', () => {
     describe('if the message is a non-empty string', () => {
       it('combines a string version of the original error and message together in a new Error', () => {

src/errors.ts

@@ -92,19 +92,22 @@ export function wrapError<Throwable>(
   message: string,
 ): Error & { code?: string } {
   if (isError(originalError)) {
-    const error: Error & { code?: string } =
-      Error.length === 2
-        ? // This branch is getting tested by using the Node version that
-          // supports `cause` on the Error constructor.
-          // istanbul ignore next
-          // Also, for some reason `tsserver` is not complaining that the
-          // Error constructor doesn't support a second argument in the editor,
-          // but `tsc` does. I'm not sure why, but we disable this in the
-          // meantime.
-          // eslint-disable-next-line @typescript-eslint/ban-ts-comment
-          // @ts-ignore
-          new Error(message, { cause: originalError })
-        : new ErrorWithCause(message, { cause: originalError });
+    let error: Error & { code?: string };
+    // This branch is getting tested by using the Node version that
+    // supports `cause` on the Error constructor.
+    // istanbul ignore next
+    if (Error.length === 2) {
+      // Also, for some reason `tsserver` is not complaining that the
+      // Error constructor doesn't support a second argument in the editor,
+      // but `tsc` does. Error causes are not supported by our current tsc target (ES2020, we need ES2022 to make this work)
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
+      error = new Error(message, { cause: originalError });
+    } else {
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
+      error = new ErrorWithCause(message, { cause: originalError });
+    }
 
     if (isErrorWithCode(originalError)) {
       error.code = originalError.code;