jest.env.js

const Environment = require("jest-environment-node");
const nodeCrypto = require("crypto");
const { TextDecoder, TextEncoder } = require("util");

module.exports = class extends Environment {
    /**
     * @summary adds TextEncoder and TextDecoder needed by `nats` dependency into Node test environment
     */
    async setup() {
        await super.setup();
        if (typeof this.global.TextEncoder === "undefined") {
            this.global.TextEncoder = TextEncoder;
            this.global.TextDecoder = TextDecoder;
            this.global.crypto = {
                getRandomValues: function (buffer) {
                    return nodeCrypto.randomFillSync(buffer);
                },
            };
        }
        this.setupBrowserEnv();
    }

    setupBrowserEnv() {
        const { process } = this.global;
        Object.defineProperty(this.global.process.release, "name", {
            ...Object.getOwnPropertyDescriptor(process.release, "name"),
            writable: true,
        });

        this.global.process.release.name = "node";

        Object.defineProperty(this.global.process.release, "name", {
            ...Object.getOwnPropertyDescriptor(process.release, "name"),
            writable: false,
        });
    }
};