Add better WASM errors

[l1h3r]

Description

Add better error messages to the wasm bindings - the current implementation doesn't provide a stack trace.

Currently most functions return Result<T, JsValue> and this gives an error message but the context is lost. The Error type from the js-sys crate should be used instead: Result<T, js_sys::Error>

Resources

• js-sys
  • Should already be a version include by wasm-bindgen (check Cargo.lock) but will need to be included to access the API.

To-do list

• Replace Result<T, JsValue> functions with Result<T, js_sys::Error> wherever appropriate

Change checklist

• The feature or fix is implemented in Rust and across all bindings whereas possible.
• The feature or fix has sufficient testing coverage
• All tests and examples build and run locally as expected
• Every piece of code has been document according to the documentation guidelines.
• If conceptual documentation (mdbook) and examples highlighting the feature exist, they are properly updated.
• If the feature is not currently documented, a documentation task Issue has been opened to address this.

[JelleMillenaar]

I believe this PR dependent on an improvement within wasm-bindgen that had an open PR. @PhilippGackstatter can you sync with @HenriqueNogara on that?

[PhilippGackstatter]

Unless I'm mistaken, this was basically fixed by #344. Stacktrace support is also there now, for example:

const { doc, key } = new Document(KeyType.Ed25519, "invalid-network");

gives:

Err > InvalidNetworkName: Invalid Network Name: network name cannot exceed 6 characters
    at module.exports.__wbg_new_80811dcb66d1b53f (~/git/identity.rs/bindings/wasm/node/identity_wasm.js:4009:15)
    at js_sys::Error::new::he73bdbceea59ac14 (<anonymous>:wasm-function[5359]:0x31937b)
    at identity_wasm::error::wasm_error::h2992dc7d9d8702bc (<anonymous>:wasm-function[1645]:0x277fef)
    at identity_wasm::did::wasm_document::WasmDocument::new::ha36dfed4e964f01f (<anonymous>:wasm-function[418]:0x17ac2e)
    at document_new (<anonymous>:wasm-function[3069]:0x2ee198)
    at new Document (~/git/identity.rs/bindings/wasm/node/identity_wasm.js:1358:24)
    at o (~/git/identity.rs/bindings/wasm/examples/dist/node.js:1:338)
    at ~/git/identity.rs/bindings/wasm/examples/dist/node.js:1:7333
    at ~/git/identity.rs/bindings/wasm/examples/dist/node.js:1:8320
    at Object.<anonymous> (~/git/identity.rs/bindings/wasm/examples/dist/node.js:1:8396)

In particular, the returned error is also an instanceof Error.

I think this issue can be closed.