Add unknown class name to deserialization error

[marcinciarka]

This pull request introduces a new test case and improves error messaging in the SuperJSON deserialization process. The changes enhance the developer experience by providing more descriptive error messages and ensuring the robustness of the code.

Enhancements to error messaging and testing:

• src/transformer.ts: Updated the error message to include the name of the unknown class being deserialized, making it easier to identify the issue.
• src/transformer.test.ts: Added a new test case to verify that an appropriate error is thrown when attempting to deserialize an unregistered class, ensuring that the error message includes missing class name.

[piotrwitek]

This is awesome change, would help debug various issues when deserialization fails when class or other element is not registered or it's module not imported. Would love to have that merged! ❤️

[Skn0tt]

wonderful change, thank you! could you add a test for it?

[marcinciarka]

wonderful change, thank you! could you add a test for it?

@Skn0tt tried for a while now and I can't seem to make it throw that error in tests, can I get some help with this? :)

[Skn0tt]

Try this:

❯ git diff src
diff --git a/src/index.test.ts b/src/index.test.ts
index e314728..ee49e72 100644
--- a/src/index.test.ts
+++ b/src/index.test.ts
@@ -810,6 +810,9 @@ describe('stringify & parse', () => {
       );
       expect(deserialized.s7).toBeInstanceOf(Train);
       expect(typeof deserialized.s7.brag()).toBe('string');
+
+      meta.values.s7 = [['class', 'Plane']];
+      expect(() => SuperJSON.deserialize(JSON.parse(JSON.stringify({ json, meta })))).toThrowError(`Trying to deserialize unknown class 'Plane' - check https://github.com/blitz-js/superjson/issues/116#issuecomment-773996564`)
     });
 
     describe('with accessor attributes', () => {

[marcinciarka]

Try this:

❯ git diff src
diff --git a/src/index.test.ts b/src/index.test.ts
index e314728..ee49e72 100644
--- a/src/index.test.ts
+++ b/src/index.test.ts
@@ -810,6 +810,9 @@ describe('stringify & parse', () => {
       );
       expect(deserialized.s7).toBeInstanceOf(Train);
       expect(typeof deserialized.s7.brag()).toBe('string');
+
+      meta.values.s7 = [['class', 'Plane']];
+      expect(() => SuperJSON.deserialize(JSON.parse(JSON.stringify({ json, meta })))).toThrowError(`Trying to deserialize unknown class 'Plane' - check https://github.com/blitz-js/superjson/issues/116#issuecomment-773996564`)
     });
 
     describe('with accessor attributes', () => {

Thank you, got it working.