如何直接从IDE调试Polymer项目？求有效教程指引

Hey there! I totally get wanting to stick to your favorite IDE for debugging instead of switching over to Chrome DevTools. Let’s break down actionable steps for VS Code, Sublime Text, and Atom—these methods should work reliably with modern Polymer versions.

VS Code Setup #

VS Code has solid tooling for Polymer, and you can debug directly in the editor without relying on Chrome’s built-in tools (though we’ll use a debugger extension that hooks into Chrome behind the scenes, all controls stay in VS Code).

1. Install Required Extensions

   • Grab the Polymer Tools extension from the VS Code Marketplace (adds syntax highlighting, linting, and component suggestions)
   • Install the Debugger for Chrome extension from the VS Code Marketplace (lets you control debugging from VS Code)

2. Configure Debug Launch
   Open your project in VS Code, go to the Run tab, and create a launch.json file with this configuration (adjust paths to match your project):

   {
     "version": "0.2.0",
     "configurations": [
       {
         "type": "chrome",
         "request": "launch",
         "name": "Launch Polymer App",
         "url": "http://localhost:8080",
         "webRoot": "${workspaceFolder}",
         "sourceMaps": true,
         "userDataDir": "${workspaceFolder}/.vscode/chrome-user-data"
       }
     ]
   }
   

   • First, start your Polymer dev server with polymer serve in the VS Code integrated terminal
   • Then hit the debug button—you can set breakpoints directly in your Polymer component files (.html or .js for Polymer 3+) and step through code right in the editor.

3. Bonus: Static Code Checking
   Enable ESLint with the Polymer ESLint plugin (install via npm) to catch errors before running your app. VS Code will highlight issues in real-time as you code.

Sublime Text Setup #

Sublime requires a few plugins to get IDE-level debugging for Polymer:

1. Install Package Control Plugins

   • Install Polymer Syntax via Package Control for proper highlighting of Polymer components
   • Add Sublime Debugger (a powerful debug tool that supports Chrome remote debugging) via Package Control

2. Enable Chrome Remote Debugging
   Launch Chrome with the remote debugging flag:

   # On Windows
   chrome.exe --remote-debugging-port=9222
   # On macOS
   /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --remote-debugging-port=9222
   

3. Configure Sublime Debugger
   Open your project, go to Tools > Debugger > New Configuration, select Chrome, and tweak the settings to point to your local Polymer server (e.g., http://localhost:8080). You can then set breakpoints in your component files and debug directly in Sublime.

Atom Setup #

Atom’s ecosystem has plugins to support Polymer debugging too:

1. Install Plugins

   • Get atom-polymer via Atom’s package manager for syntax highlighting and snippets
   • Add chrome-debugger via Atom’s package manager to connect to Chrome from Atom

2. Configure Debugging

   • Launch Chrome with the same remote debugging flag as above
   • In Atom, open the Chrome Debugger panel, add a new target pointing to your Polymer app’s URL
   • Set breakpoints in your component files—Atom will sync with Chrome’s debug session, letting you step through code without leaving the editor.

General Tips (No Debugger Needed) #

If you want to avoid debuggers entirely, these tricks can help you catch issues early:

• Run polymer lint in your IDE’s terminal to scan for component errors and best practice violations
• Use polymer test to run unit tests for your components—test failures will point you directly to problematic code
• Add console.log statements and view the output in your IDE’s integrated terminal (if using polymer serve, logs will show up there)

Note: A lot of older tutorials fail because they’re written for Polymer 1.x/2.x, while modern projects use Polymer 3+ (which is ES module-based). Make sure your plugin versions match your Polymer version!

内容的提问来源于stack exchange，提问作者Jim C