fix: potential file system race conditions fixes

Author: Hristo Hristov

packages/cli/lib/templates/ReactTemplate.ts

@@ -123,12 +123,16 @@ export class ReactTemplate implements Template {
 					igniteuiResFile = igniteuiResFile.replace(freeVersionPath, fullVersionPath);
 					igniteuiResFile = igniteuiResFile.replace("-lite", "");
 				}
-				fs.writeFileSync(igResPath, igniteuiResFile);
+
+				const fd = fs.openSync(igResPath, fs.constants.O_WRONLY | fs.constants.O_TRUNC);
+				fs.writeSync(fd, igniteuiResFile);
+				fs.closeSync(fd);
 			}
 
 			if (dvDep && !igniteuiResFile.includes(dvPath)) {
-				fs.appendFileSync(igResPath, `${'\r\n// Ignite UI Charts Required JavaScript File\r\nimport "'
-					+ dvPath + '";\r\n'}`);
+				const fd = fs.openSync(igResPath, fs.constants.O_WRONLY | fs.constants.O_APPEND);
+				fs.writeSync(fd, `\r\n// Ignite UI Charts Required JavaScript File\r\nimport "${dvPath}";\r\n`);
+				fs.closeSync(fd);
 			}
 
 		} else {

packages/core/util/GoogleAnalytics.ts

@@ -69,16 +69,16 @@ class GoogleAnalytics {
 	protected static getUUID(): string {
 		const absolutePath = path.join(this.userDataFolder, this.appFolder, this.userSettings);
 		let UUID = "";
-		if (fs.existsSync(absolutePath)) {
-			UUID = require(absolutePath).UUID;
-		} else {
-			const dirName = path.dirname(absolutePath);
-			if (!fs.existsSync(dirName)) {
-				fs.mkdirSync(dirName);
-			}
+		const dirName = path.dirname(absolutePath);
+		fs.mkdirSync(dirName, { recursive: true });
 
+		try {
+			const fd = fs.openSync(absolutePath, fs.constants.O_CREAT | fs.constants.O_EXCL | fs.constants.O_RDWR, 0o600);
 			UUID = this.getUserID();
-			fs.writeFileSync(absolutePath, JSON.stringify({ UUID }));
+			fs.writeFileSync(fd, JSON.stringify({ UUID }));
+			fs.closeSync(fd);
+		} catch {
+			UUID = JSON.parse(fs.readFileSync(absolutePath, "utf8")).UUID;
 		}
 
 		return UUID;