Add an async browser wrapper for easier webpack usage

Author: pimterry

index.browser.js

@@ -0,0 +1,7 @@
+// This makes importing wasm-brotli asynchronous (because of dynamic import).
+// This is needed here for Webpack v4 or v5 syncWebAssembly, which don't
+// allow synchronous import of WebAssembly from an entrypoint.
+module.exports = import("./pkg.bundler/brotli_wasm.js");
+
+// We don't want to do this for _all_ usage, because dynamic import isn't
+// supported in older node versions.

package.json

@@ -4,7 +4,7 @@
   "description": "A compressor and decompressor for Brotli that actually works, for node & browsers",
   "main": "./pkg.node/brotli_wasm.js",
   "types": "./pkg.node/brotli_wasm.d.ts",
-  "browser": "./pkg.bundler/brotli_wasm.js",
+  "browser": "./index.browser.js",
   "sideEffects": false,
   "scripts": {
     "build": "node ./build.js",