feat(load-emscripten-module-node): load zstd compressed wasm

Author: thewtex

packages/core/typescript/itk-wasm/src/pipeline/internal/load-emscripten-module-node.ts

@@ -1,8 +1,12 @@
 import fs from 'fs'
 import EmscriptenModule from '../itk-wasm-emscripten-module.js'
 import { pathToFileURL } from 'url'
+import { ZSTDDecoder } from '@thewtex/zstddec'
 
-async function loadEmscriptenModuleNode (
+const zstdDecoder = new ZSTDDecoder()
+await zstdDecoder.init()
+
+async function loadEmscriptenModuleNode(
   modulePath: string
 ): Promise<EmscriptenModule> {
   let modulePrefix = modulePath
@@ -12,8 +16,12 @@ async function loadEmscriptenModuleNode (
   if (modulePath.endsWith('.wasm')) {
     modulePrefix = modulePath.substring(0, modulePath.length - 5)
   }
-  const wasmBinaryPath = `${modulePrefix}.wasm`
-  const wasmBinary = fs.readFileSync(wasmBinaryPath)
+  if (modulePath.endsWith('.wasm.zst')) {
+    modulePrefix = modulePath.substring(0, modulePath.length - 9)
+  }
+  const compressedWasmBinaryPath = `${modulePrefix}.wasm.zst`
+  const compressedWasmBinary = fs.readFileSync(compressedWasmBinaryPath)
+  const wasmBinary = zstdDecoder.decode(new Uint8Array(compressedWasmBinary))
   const fullModulePath = pathToFileURL(`${modulePrefix}.js`).href
   const result = await import(
     /* webpackIgnore: true */ /* @vite-ignore */ fullModulePath