Selective import when bundling?

Hi. I’m new to bundling. Is it possible to only import what it’s used on the app?

This is my test app:

import { AudioContext, AnalyserNode, MediaElementAudioSourceNode } from 'standardized-audio-context';
let playFlag = false;
const clickHandler = () => {
    if (playFlag === false) {
        if (window.audioContext === undefined) {
            const audioContext = new AudioContext();
            window.audioContext = audioContext;
            const audioStream = new Audio();
            audioStream.crossOrigin = 'anonymous';
            audioStream.src = 'http://stream';
            window.audioStream = audioStream;            
            const audioAnalyser = audioContext.createAnalyser();
            const audioSource = audioContext.createMediaElementSource(audioStream);
            audioSource.connect(audioAnalyser);
            audioAnalyser.connect(audioContext.destination);
            const audioBuffer = new Uint8Array(audioAnalyser.frequencyBinCount);
            audioAnalyser.getByteFrequencyData(audioBuffer);
            window.audioBuffer = audioBuffer;
            audioContext.resume();
        }
        window.audioStream.play();
        playFlag = true;
    } else {
        window.audioStream.pause();
        playFlag = false;
    }
};
document.getElementById('player-button').addEventListener('click', clickHandler);

This is my Rollup config:

import resolve from '@rollup/plugin-node-resolve';
export default {
    input: 'app.js',
    output: {
        file: 'bundle.js',
        format: 'iife',
        name: 'bundle'
    },
    plugins: [
        resolve({
            mainFields: ['module', 'browser', 'main']
        })
    ]
};

The resulting bundle includes the whole library. Thanks!

[chrisguttandin]

Sorry for the confusion. I tested this with an ancient version (v16) of standardized-audio-context. I get similar numbers with the latest version as you.

[endlessuniverse]

I replaced mediaStream with mediaElement in the second parameter of MediaElementAudioSourceNode constructor.

Just tested and the bundle with the AudioContext version takes up 373963 bytes, while the MinimalAudioContext one takes up 149799 bytes.

The package.json created with yarn:

{
  "dependencies": {
    "@rollup/plugin-node-resolve": "^13.0.5",
    "rollup": "^2.58.0",
    "standardized-audio-context": "^25.3.12"
  }
}