使用Angular CLI生成的新项目无法正常运行，该如何排查解决？

Hey there, let's work through getting your Angular 5 project up and running smoothly. Based on the package.json snippet you shared (showing Angular 5.2.0 dependencies), here are actionable steps to diagnose and fix the issue:

1. Ensure All Dependencies Are Installed Correctly #

First, partial or failed dependency installs are a super common culprit when new Angular projects won't run. Navigate to your project folder and re-install all dependencies to rule this out:

cd whattodo
npm install

Keep an eye on the console for any error messages (like network timeouts or conflicting package versions). If you prefer Yarn, swap npm install with yarn install.

2. Clear Caches and Restart #

Cached files often cause weird, unexplained issues with Angular CLI projects. Try these cache-clearing steps:

• Clear the npm cache:

  npm cache clean --force
  

• Clear Angular CLI's local cache:

  ng cache clean
  

• Restart the development server:

  ng serve
  

3. Verify Node.js Version Compatibility #

Angular 5.2.0 has strict Node.js version requirements — it works best with Node 8.9.x or newer, up to Node 9.x. Check your current Node version with:

node -v

If your version is outside this range, use a version manager like nvm (Node Version Manager) to switch to a compatible version. For example:

nvm install 8.17.0
nvm use 8.17.0

4. Match Angular CLI Versions #

Angular 5 projects are designed to work with Angular CLI v1.7.x (the latest CLI version compatible with Angular 5). Check your global CLI version with:

ng --version

If you have a newer global CLI installed, it might clash with your project. You have two fixes here:

• Use the local CLI installed in your project to start the server:

  npx ng serve
  

Or install the compatible global CLI version:

npm install @angular/cli@1.7.4 -g

5. Dig Into Specific Error Messages #

If the above steps don't resolve the issue, run ng serve and share the exact error output from your terminal. Common issues to look for include:

• Port 4200 being occupied: Fix this by specifying a different port with ng serve --port 4201
• Missing or corrupted dependencies: Look for "Cannot find module" errors and re-install the affected package
• Compilation errors: Check for TypeScript syntax issues in your component files

内容的提问来源于stack exchange，提问作者vikas