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errors.ts
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/
errors.ts
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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
import { Base, ErrorKind } from "gen/cli/msg_generated";
export { ErrorKind } from "gen/cli/msg_generated";
/** A Deno specific error. The `kind` property is set to a specific error code
* which can be used to in application logic.
*
* try {
* somethingThatMightThrow();
* } catch (e) {
* if (
* e instanceof Deno.DenoError &&
* e.kind === Deno.ErrorKind.Overflow
* ) {
* console.error("Overflow error!");
* }
* }
*
*/
export class DenoError<T extends ErrorKind> extends Error {
constructor(readonly kind: T, msg: string) {
super(msg);
this.name = ErrorKind[kind];
}
}
// @internal
export function maybeError(base: Base): null | DenoError<ErrorKind> {
const kind = base.errorKind();
if (kind === ErrorKind.NoError) {
return null;
} else {
return new DenoError(kind, base.error()!);
}
}
// @internal
export function maybeThrowError(base: Base): void {
const err = maybeError(base);
if (err != null) {
throw err;
}
}