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lib/errors: Improve typings by extending Error class for predicates

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When using the predicate functions in bluebird `.catch`es from
typescript, the compiler would complain that the predicates do not
accept a function which takes an error. Because these are specific
errors, I've extended the base `Error` class, and added the extra fields
we expect.

Change-type: patch
Signed-off-by: Cameron Diver <cameron@resin.io>
This commit is contained in:
Cameron Diver 2018-09-13 12:01:10 +01:00
parent 71dd2fc72e
commit d37eb8e8a9
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GPG Key ID: 69264F9C923F55C1
1 changed files with 13 additions and 3 deletions
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16
src/lib/errors.ts
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@ -3,15 +3,25 @@ import TypedError = require('typed-error');
import { checkInt } from './validation';
export function NotFoundError(err: { statusCode?: string }): boolean {
// To keep the bluebird typings happy, we need to accept
// an error, and in this case, it would also contain a status code
interface StatusCodeError extends Error {
statusCode?: string;
}
interface CodedSysError extends Error {
code?: string;
}
export function NotFoundError(err: StatusCodeError): boolean {
return checkInt(err.statusCode) === 404;
}
export function ENOENT(err: { code: string, [key: string]: any }): boolean {
export function ENOENT(err: CodedSysError): boolean {
return err.code === 'ENOENT';
}
export function EEXIST(err: { code: string, [key: string]: any }): boolean {
export function EEXIST(err: CodedSysError): boolean {
return err.code === 'EEXIST';
}