fix(rspack): prevents an unhandled promise rejection when throwing in the async loader (#536)

Author: elbywan

src/rspack/loaders/load.ts

@@ -18,19 +18,29 @@ export default async function load(this: LoaderContext, source: string, map: any
 
  const context = createContext(this)
  const { handler } = normalizeObjectHook('load', plugin.load)
- const res = await handler.call(
- Object.assign(
- {},
- this._compilation && createBuildContext(this._compiler, this._compilation, this),
- context,
- ),
- normalizeAbsolutePath(id),
- )
+ try {
+ const res = await handler.call(
+ Object.assign(
+ {},
+ this._compilation && createBuildContext(this._compiler, this._compilation, this),
+ context,
+ ),
+ normalizeAbsolutePath(id),
+ )
 
- if (res == null)
- callback(null, source, map)
- else if (typeof res !== 'string')
- callback(null, res.code, res.map ?? map)
- else
- callback(null, res, map)
+ if (res == null)
+ callback(null, source, map)
+ else if (typeof res !== 'string')
+ callback(null, res.code, res.map ?? map)
+ else
+ callback(null, res, map)
+ }
+ catch (error) {
+ if (error instanceof Error) {
+ callback(error)
+ }
+ else {
+ callback(new Error(String(error)))
+ }
+ }
 }