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.

npm install --save @f1stnpm3/modi-nobis-quasi

const assert = require('assert');

require('@f1stnpm3/modi-nobis-quasi/auto');

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

Clone the repo, npm install, and run npm test