Add ESM export for Node (#388)

* Add ESM export for Node

* Add changeset

user_preferences_bindings_wasm/.changeset/red-beans-vanish.md

@@ -0,0 +1,5 @@
+---
+"@xmtp/user-preferences-bindings-wasm": patch
+---
+
+Add ESM export for Node

user_preferences_bindings_wasm/package.json

@@ -8,7 +8,7 @@
     "build": "npm run clean && npm run build:web && npm run build:bundler && npm run build:node && npm run clean:gitignore",
     "build:web": "wasm-pack build --target web --no-pack --release --out-dir ./dist/web",
     "build:bundler": "wasm-pack build --target bundler --no-pack --release --out-dir ./dist/bundler",
-    "build:node": "wasm-pack build --target nodejs --no-pack --release --out-dir ./dist/node",
+    "build:node": "wasm-pack build --target nodejs --no-pack --release --out-dir ./dist/node && node ./scripts/targetESM.js",
     "prepublishOnly": "npm run build",
     "clean": "rm -rf ./dist",
     "clean:gitignore": "rm -f ./dist/**/.gitignore"
@@ -21,12 +21,12 @@
     "./dist/**/*"
   ],
   "main": "dist/node/user_preferences_bindings_wasm.js",
-  "module": "dist/bundler/user_preferences_bindings_wasm.js",
+  "module": "dist/node/user_preferences_bindings_wasm.mjs",
   "types": "dist/node/user_preferences_bindings_wasm.d.ts",
   "exports": {
     ".": {
-      "types": "./dist/bundler/user_preferences_bindings_wasm.d.ts",
-      "import": "./dist/bundler/user_preferences_bindings_wasm.js",
+      "types": "./dist/node/user_preferences_bindings_wasm.d.ts",
+      "import": "./dist/node/user_preferences_bindings_wasm.mjs",
       "require": "./dist/node/user_preferences_bindings_wasm.js"
     },
     "./bundler": {

user_preferences_bindings_wasm/scripts/targetESM.js

@@ -0,0 +1,36 @@
+import { readFile, writeFile } from "node:fs/promises";
+
+const cargoTomlContent = await readFile("./Cargo.toml", "utf8");
+const cargoPackageName = /\[package\]\nname = "(.*?)"/.exec(
+  cargoTomlContent
+)[1];
+const name = cargoPackageName.replace(/-/g, "_");
+
+const content = await readFile(`./dist/node/${name}.js`, "utf8");
+
+const patched = content
+  // use global TextDecoder TextEncoder
+  .replace(
+    "let imports = {};",
+    `import { readFile } from "node:fs/promises";
+import { dirname, join }  from "node:path";
+import { fileURLToPath } from 'url';
+let imports = {};
+`
+  )
+  .replace(/const \{ TextDecoder \} = require\(`util`\);\n/, "")
+  // attach to `imports` instead of module.exports
+  .replace("= module.exports", "= imports")
+  .replace(/\nmodule\.exports\.(.*?)\s+/g, "\nexport const $1 = imports.$1 ")
+  .replace(/$/, "export default imports;")
+  .replace(
+    /\nconst path.*\nconst bytes.*\n/,
+    `
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+const path = join(__dirname, "${name}_bg.wasm");
+const bytes = await readFile(path);
+`
+  );
+
+await writeFile(`./dist/node/${name}.mjs`, patched);