Better error handling in src/handlers.rs

Introduces error codes that are shared between JS/RS

Fixes #526.

1 files changed, 15 insertions, 0 deletions

diff --git a/js/errors.ts b/js/errors.ts
new file mode 100644
index 000000000..2fca10eaf
--- /dev/null
+++ b/js/errors.ts
@@ -0,0 +1,15 @@
+import { deno as fbs } from "gen/msg_generated";
+
+export class DenoError<T extends fbs.ErrorKind> extends Error {
+  constructor(readonly kind: T, msg: string) {
+    super(msg);
+    this.name = `deno.${fbs.ErrorKind[kind]}`;
+  }
+}
+
+export function maybeThrowError(base: fbs.Base): void {
+  const kind = base.errorKind();
+  if (kind !== fbs.ErrorKind.NoError) {
+    throw new DenoError(kind, base.error()!);
+  }
+}