`ReferenceError: TextEncoder is not defined` when running `react-scripts test –env=jsdom`

jsdom Doesn’t seem to have TextEncoder defined in global for the DOM. So you can fill it in with the node.js one.

test/custom-test-env.js:

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

/**
 * A custom environment to set the TextEncoder that is required by TensorFlow.js.
 */
module.exports = class CustomTestEnvironment extends Environment {
    async setup() {
        await super.setup();
        if (typeof this.global.TextEncoder === 'undefined') {
            const { TextEncoder } = require('util');
            this.global.TextEncoder = TextEncoder;
        }
    }
}

npx react-scripts test --env=./test/custom-test-env.js