rather than throw our own error, throw the error from node's ESM loader

Author: cspotcode

src/esm.ts

@@ -181,15 +181,7 @@ export function createEsmHooks(tsNodeService: Service) {
           rememberResolvedViaCommonjsFallback.add(resolution);
           return { url: resolution, format: 'commonjs' };
         } catch (commonjsResolverError) {
-          throw new Error(
-            `Resolution via the ECMAScript loader failed.\n` +
-              `ts-node guessed that this resolution was likely the entrypoint script, so attempted a fallback to the CommonJS resolver.\n` +
-              `CommonJS resolver threw:\n` +
-              `${
-                (commonjsResolverError as Error)?.message ??
-                commonjsResolverError
-              }`
-          );
+          throw esmResolverError;
         }
       }
     }

src/test/esm-loader.spec.ts

@@ -292,6 +292,13 @@ test.suite('esm', (test) => {
           expect(err).toBe(null);
           expect(stdout.trim()).toBe('Hello world!');
         });
+        test('fails as expected when entrypoint does not exist at all', async (t) => {
+          const { err, stderr } = await exec(
+            `${CMD_ESM_LOADER_WITHOUT_PROJECT} ./esm-loader-entrypoint-cjs-fallback/does-not-exist`
+          );
+          expect(err).toBeDefined();
+          expect(stderr).toContain(`Cannot find module `);
+        });
       }
     );
   });