@mtth/stl-errors

Standard errors

Motivation

Good error handling is a prerequisite for good telemetry. To help with this, @mtth/stl-errors provides a simple StandardError interface which exposes powerful building blocks:

• Namespaced error codes;
• Causal chains;
• Optional structured data.

Quickstart

Standard errors are best created via errorFactories which provides type-safe error creation functions along with their codes:

import {errorFactories} from '@mtth/stl-errors';

const [errors, codes] = errorFactories({
  definitions: {
    invalidFoo: (foo: string) => ({
      message: `The input foo ${foo} was invalid`,
      tags: {foo},
    }),
    missingBar: 'The bar was missing',
  },
});

// Error with code `ERR_INVALID_FOO` (`codes.InvalidFoo`).
const err1 = errors.invalidFoo('fff');

// Error with code `ERR_MISSING_BAR` (`codes.MissingBar`).
const err2 = errors.missingBar();