custom-jest-env.js

const Environment = require("jest-environment-jsdom");

module.exports = class CustomTestEnvironment extends Environment {
  async setup() {
    await super.setup();
    if (typeof this.global.TextEncoder === "undefined") {
      const { TextEncoder, TextDecoder } = require("util");
      this.global.TextEncoder = TextEncoder;
      this.global.TextDecoder = TextDecoder;
    }
    this.global.Uint8Array = Uint8Array;
  }
};