gltfpack: Restore automatic initialization in node.js

This improves compatibility when the package is used through node; we
used to automatically init the package using synchronous file loads.

To do that, we need to dynamically import node's fs module to avoid
taking a bundle-time dependency on it in browser builds.

Author: zeux

.github/workflows/build.yml

@@ -93,7 +93,7 @@ jobs:
         run: |
           npm install -g es-check@7.2.1
           npx es-check --module es5 js/meshopt_decoder.js js/meshopt_encoder.js js/meshopt_simplifier.js js/meshopt_clusterizer.js
-          npx es-check --module es5 gltf/library.js
+          npx es-check --module es2020 gltf/library.js
 
   gltfpack:
     runs-on: ubuntu-latest

gltf/cli.js

@@ -1,10 +1,8 @@
 #!/usr/bin/env node
 // This file is part of gltfpack and is distributed under the terms of MIT License.
-import { init, pack } from './library.js';
+import { pack } from './library.js';
 import fs from 'fs';
 
-init(fs.readFileSync(new URL('./library.wasm', import.meta.url)));
-
 var args = process.argv.slice(2);
 
 var iface = {

gltf/library.js

@@ -344,4 +344,13 @@ function uploadArgv(argv) {
 	return buf;
 }
 
+// Automatic initialization for node.js
+if (typeof process !== 'undefined' && process.release && process.release.name === 'node') {
+	init(
+		import('node:fs').then(function (fs) {
+			return fs.readFileSync(new URL('./library.wasm', import.meta.url));
+		})
+	);
+}
+
 export { init, pack };