JSFiddle - React, Tailwind, and code Playground

Babel + JSX

let audioCtx = new AudioContext();

// Create nodes
let osc = audioCtx.createOscillator();
let gain = audioCtx.createGain();

// Set parameters
osc.frequency.value = 440;
gain.gain.value = 1;

// Connect graph
osc.connect(gain);
gain.connect(audioCtx.destination);

// Schedule start, change, and stop
osc.start();
gain.gain.setValueAtTime(0.5, 1);
osc.stop(audioCtx.currentTime + 2);