Migrate to Vite+ unified toolchain (#428)

crates/yaak-templates/build-wasm.cjs

@@ -1,4 +1,6 @@
 const { execSync } = require('node:child_process');
+const fs = require('node:fs');
+const path = require('node:path');
 
 if (process.env.SKIP_WASM_BUILD === '1') {
   console.log('Skipping wasm-pack build (SKIP_WASM_BUILD=1)');
@@ -6,3 +8,20 @@ if (process.env.SKIP_WASM_BUILD === '1') {
 }
 
 execSync('wasm-pack build --target bundler', { stdio: 'inherit' });
+
+// Rewrite the generated entry to use Vite's ?init import style instead of
+// the ES Module Integration style that wasm-pack generates, which Vite/rolldown
+// does not support in production builds.
+const entry = path.join(__dirname, 'pkg', 'yaak_templates.js');
+fs.writeFileSync(
+  entry,
+  [
+    'import init from "./yaak_templates_bg.wasm?init";',
+    'export * from "./yaak_templates_bg.js";',
+    'import * as bg from "./yaak_templates_bg.js";',
+    'const instance = await init({ "./yaak_templates_bg.js": bg });',
+    'bg.__wbg_set_wasm(instance.exports);',
+    'instance.exports.__wbindgen_start();',
+    '',
+  ].join('\n'),
+);