mirror of
https://github.com/denoland/deno
synced 2024-10-13 03:22:31 +00:00
8090fb252b
Originally we planned to have a JS class for each error code. But it seems better to just have a single DenoError class with a "kind" property. One nice thing about using an enum instead of classes for errors is that switch() can be used during error handling instead of a bunch of instanceof branches.
28 lines
650 B
TypeScript
28 lines
650 B
TypeScript
import * as fbs from "gen/msg_generated";
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export { ErrorKind } from "gen/msg_generated";
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// @internal
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export class DenoError<T extends fbs.ErrorKind> extends Error {
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constructor(readonly kind: T, msg: string) {
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super(msg);
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this.name = fbs.ErrorKind[kind];
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}
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}
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// @internal
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export function maybeThrowError(base: fbs.Base): void {
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const err = maybeError(base);
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if (err != null) {
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throw err;
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}
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}
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export function maybeError(base: fbs.Base): null | DenoError<fbs.ErrorKind> {
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const kind = base.errorKind();
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if (kind === fbs.ErrorKind.NoError) {
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return null;
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} else {
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return new DenoError(kind, base.error()!);
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}
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}
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