error-cause

An ES-spec-compliant shim/polyfill/replacement for the .cause property on all Error types that works as far down as ES3

This package implements the es-shim API “multi” interface. It works in an ES3-supported environment and complies with the proposed spec.

Getting started

npm install --save error-cause

Usage/Examples

const assert = require('assert');

require('error-cause/auto');

try {
        x();
} catch (e) {
        const actual = new Error('a better message!', { cause: e });
        assert(actual instanceof Error);
        assert(actual.cause === e);
}

Tests

Clone the repo, npm install, and run npm test