await bundle(...assets).targeting(WebGL).to('/path/to/asset.bundle');

import { BuildTargets, bundle } from '@mitm/assetbundlecompiler';

const { WebGL } = BuildTargets;

// bundle() is the entry function to the API.
// Pass a list of assets to bundle into the resulting asset bundle.
// Those assets could be anywhere on the filesystem.
// To pass an array of paths, use bundle(...paths) syntax.
await bundle('/abs/path/to/fbx', '/abs/path/to/texture', /* ... */)
    // .targeting() is mandatory and tells the library what platform your asset bundle targets.
    // You can either pass a predefined constant in BuildTargets, or a string,
    // matching the name of a member of the UnityEditor.BuildTarget enum.
    // @see https://docs.unity3d.com/ScriptReference/BuildTarget.html
    .targeting(WebGL)
    
    // Lets you install custom Editor scripts before asset bundle generation.
    // This is very useful, for example, to create an Asset Postprocessor to customize how
    // your resources are imported into the asset bundle, using AssetImporters for example.
    // @see https://docs.unity3d.com/ScriptReference/AssetPostprocessor.html
    .includingEditorScripts('/abs/path/to/script.dll', '/abs/path/to/script.cs')
    
    // Lets you define build options. Those are always flags, and the key names represent
    // member names of the UnityEditor.BuildAssetBundleOptions enum.
    // @see https://docs.unity3d.com/ScriptReference/BuildAssetBundleOptions.html
    .withBuildOptions({ chunkBasedCompression: true, strictMode: true, /* etc */ })
    
    // This lets you define a simple logger to get simple text updates about the conversion.
    .withLogger(message => console.log(message))
    
    // This lets you define a logger for the real-time output of Unity (stdout+stderr).
    // Beware, it's very verbose :)
    .withUnityLogger(message => console.log(`Unity: ${message}`))
    
    // This is the "run" function and marks the termination of the fluent calls
    // by returning a Promise that resolves when the asset bundle generation ends.
    // Give it a path to the asset bundle name or a fs.WriteStream.
    .to('/abs/path/to/resources.assetbundle');

// The promise gets resolved with the manifest as a plain JS object
const manifest = await bundle('...').to('...');

/* manifest = { 
    CRC: 2924050344,
    Assets: ['Assets/CopiedAssets/MyAsset.jpg'],
    ...etc...
} */

const manifest = await bundle('...')
    // manifestFile can take a path or a fs.WriteStream too
    .to('/path/to/resources.assetbundle', { manifestFile: '/path/to/resources.assetbundle.manifest' });

class UnityCrashError extends Error {
    public readonly message: string; // Exception message
    public readonly unityLog: string; // Unity Editor log (contains crash information)
}

import { setUnityPath } from '@mitm/assetbundlecompiler';

// given that you define the environment variable UNITY_EDITOR_PATH, to avoid hardcoded path:
setUnityPath(process.env.UNITY_EDITOR_PATH);