refactoring to ts

lib/sync.ts

@@ -0,0 +1,52 @@
+#! /usr/bin/env node
+
+// @ts-check
+
+const { spawn } = require("child_process");
+const watchFiles = require("./watch/files");
+const watchFolders = require("./watch/folders");
+
+const confFileProvidedJSON = process.argv[process.argv.length - 1];
+
+try {
+    const configFileObject = JSON.parse(confFileProvidedJSON);
+
+    console.log(`Running '${configFileObject.title}' ...`);
+
+    if (
+        Array.isArray(configFileObject.files) &&
+        Array.isArray(configFileObject.folders)
+    ) {
+        throw new Error("Choose wither `files` or `folders`. Not both");
+    }
+
+    const files = configFileObject?.files;
+    const firstFile = files?.[0];
+    const folders = configFileObject?.folders;
+    const firstFolder = folders?.[0];
+
+    const options = configFileObject.options;
+
+    if (firstFile && files?.[0]) {
+        watchFiles({ files, options });
+    } else if (firstFolder && folders?.[0]) {
+        watchFolders({ folders, options });
+    }
+} catch (error) {
+    console.log(error);
+    process.exit();
+}
+
+process.on("exit", (code) => {
+    if (code == 1) {
+        const args = process.argv;
+        const cmd = args.shift();
+        if (cmd) {
+            spawn(cmd, args, {
+                stdio: "inherit",
+            });
+        }
+    } else {
+        process.exit(0);
+    }
+});