Layerr NPM | npm.io

Layerr

Errors, with.. layers..

A NodeJS and Web Error wrapping utility, based heavily on VError, but without all the extras and dependencies on Node core utilities. Written in Typescript, compiled to JavaScript and suitable for bundling in the browser.

Uses no dependencies, minifies well and is a great way to wrap errors as they propagate through complex applications (such as Express services, for instance).

Layerr is an ESM library, and as such you need a compatible environment in which to install and use it.

Installation

Install by running: npm install layerr.

Usage

Use it as a regular error:

const { Layerr } = require("layerr");

throw new Layerr("Test error");

Or use it to wrap errors:

doSomething().catch((err) => {
    throw new Layerr(err, "Failed doing something");
});

Layerr's can have info attached:

const { Layerr } = require("layerr");

function somethingElse() {
    throw new Layerr(
        {
            info: {
                code: 123,
            },
        },
        "Problem"
    );
}

somethingElse().catch((err: Layerr) => {
    const { code } = Layerr.info(err);
    // code === 123
});

Global Name

By default Layerr names all created errors as Layerr. You can change this name by calling setGlobalName, and revert it by passing null to this function:

import { Layerr, setGlobalName } from "layerr";

setGlobalName("CustomError");

const err = new Layerr("My error");

err.name; // "CustomError"

throw err;
// Uncaught Layerr [CustomError]: My error