migrate build scripts to esmodules (#17071)

* chore: migrate build scripts to esmodules

* chore: do not use export default in build script

scripts/build-pre.mjs

@@ -0,0 +1,30 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import * as fs from 'node:fs';
+
+const __dirname = import.meta.dirname;
+
+const packageJsonPath = __dirname + '/../package.json'
+
+function build() {
+	try {
+		const json = fs.readFileSync(packageJsonPath, 'utf-8')
+		const meta = JSON.parse(json);
+		fs.mkdirSync(__dirname + '/../built', { recursive: true });
+		fs.writeFileSync(__dirname + '/../built/meta.json', JSON.stringify({ version: meta.version }), 'utf-8');
+	} catch (e) {
+		console.error(e)
+	}
+}
+
+build();
+
+if (process.argv.includes("--watch")) {
+	fs.watch(packageJsonPath, (event, filename) => {
+		console.log(`update ${filename} ...`)
+		build()
+	})
+}