examples: add preinstall script

examples/nodejs/package.json

@@ -1,6 +1,9 @@
 {
   "type": "module",
   "main": "index.js",
+  "scripts": {
+    "preinstall": "cargo run --bin bundle_pubky_npm"
+  },
   "dependencies": {
     "@synonymdev/pubky":"file:../../pubky/pkg" 
   }

examples/web/auth/package.json

@@ -6,7 +6,7 @@
     "build": "vite build",
     "start": "vite serve",
     "preview": "vite preview",
-    "wasm": "wasm-pack build ../../../pubky/ --target web"
+    "preinstall": "cargo run --bin bundle_pubky_npm"
   },
   "dependencies": {
     "@synonymdev/pubky": "file:../../../pubky/pkg",

examples/web/no-bundler/package.json

@@ -1,6 +1,7 @@
 {
   "scripts": {
-    "start": "vite serve"
+    "start": "vite serve",
+    "preinstall": "cargo run --bin bundle_pubky_npm"
   },
   "dependencies": {
     "@synonymdev/pubky": "file:../../../pubky/pkg",

pubky/src/bin/bundle_pubky_npm.rs

@@ -1,3 +1,4 @@
+use std::env;
 use std::io;
 use std::process::{Command, ExitStatus};
 
@@ -11,9 +12,12 @@ fn main() {
 }
 
 fn build_wasm(target: &str) -> io::Result<ExitStatus> {
+    let manifest_dir = env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR not set");
+
     let output = Command::new("wasm-pack")
         .args([
             "build",
+            &manifest_dir,
             "--release",
             "--target",
             target,
@@ -38,8 +42,11 @@ fn build_wasm(target: &str) -> io::Result<ExitStatus> {
 }
 
 fn patch() -> io::Result<ExitStatus> {
+    let manifest_dir = env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR not set");
+
+    println!("{manifest_dir}/src/bin/patch.mjs");
     let output = Command::new("node")
-        .args(["./src/bin/patch.mjs"])
+        .args([format!("{manifest_dir}/src/bin/patch.mjs")])
         .output()?;
 
     println!(
@@ -49,7 +56,7 @@ fn patch() -> io::Result<ExitStatus> {
 
     if !output.status.success() {
         eprintln!(
-            "wasm-pack failed: {}",
+            "patch.mjs failed: {}",
             String::from_utf8_lossy(&output.stderr)
         );
     }

pubky/src/bin/patch.mjs

@@ -3,12 +3,17 @@
 // Based on hacks from [this issue](https://github.com/rustwasm/wasm-pack/issues/1334)
 
 import { readFile, writeFile } from "node:fs/promises";
+import { fileURLToPath } from 'node:url';
+import path, { dirname } from 'node:path';
 
-const cargoTomlContent = await readFile("./Cargo.toml", "utf8");
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+const cargoTomlContent = await readFile(path.join(__dirname, "../../Cargo.toml"), "utf8");
 const cargoPackageName = /\[package\]\nname = "(.*?)"/.exec(cargoTomlContent)[1]
 const name = cargoPackageName.replace(/-/g, '_')
 
-const content = await readFile(`./pkg/nodejs/${name}.js`, "utf8");
+const content = await readFile(path.join(__dirname, `../../pkg/nodejs/${name}.js`), "utf8");
 
 const patched = content
   // use global TextDecoder TextEncoder
@@ -46,9 +51,9 @@ var __toBinary = /* @__PURE__ */ (() => {
   };
 })();
 
-const bytes = __toBinary(${JSON.stringify(await readFile(`./pkg/nodejs/${name}_bg.wasm`, "base64"))
+const bytes = __toBinary(${JSON.stringify(await readFile(path.join(__dirname, `../../pkg/nodejs/${name}_bg.wasm`), "base64"))
     });
 `,
   );
 
-await writeFile(`./pkg/${name}.mjs`, patched);
+await writeFile(path.join(__dirname, `../../pkg/${name}.mjs`), patched);