在Heroku运行Discord.js机器人时出现本地未触发的报错求助

Hey there, let's break down why your Discord bot is throwing errors on Heroku when it runs perfectly locally. The error log points straight to the first line of your app.js file, which gives us a clear starting point for debugging. Here are the most common fixes to try:

1. Check for Missing Dependencies #

Local development often lets you get away with globally installed packages, but Heroku only installs what's listed in your package.json.

• Double-check that every package you're requiring/importing in app.js (like discord.js) is in the dependencies section of your package.json.
• Make sure you've committed your package-lock.json or yarn.lock file to Git—Heroku uses these to install exact dependency versions, avoiding mismatches that could break your bot.

2. Fix Case-Sensitive File Paths #

Heroku runs on Linux, which is strictly case-sensitive for file paths, unlike Windows (and sometimes macOS). If your first line references a file like ./Config.js but the actual file is named ./config.js, Heroku will throw a "file not found" error that you won't see locally.

• Verify that all file paths in your require/import statements match the exact case of your file names.

3. Configure Environment Variables #

If your first line uses environment variables (like your Discord bot token), Heroku won't automatically pick up your local .env file.

• Go to your Heroku app's Settings > Config Vars and add all the environment variables your bot needs (e.g., DISCORD_TOKEN).
• Ensure your code doesn't hardcode sensitive values—always pull them from environment variables to keep your bot secure and compatible with Heroku.

4. Match Node.js Versions #

A mismatch between your local Node.js version and the one Heroku uses can cause syntax or compatibility errors (especially if you're using ES6+ features).

• Add an engines field to your package.json to specify the exact Node version you're using locally:

  "engines": {
    "node": "16.x"
  }
  

• Replace 16.x with your local Node version (run node -v in your terminal to check the exact number).

Quick Debugging Tip #

Use the heroku local command on your machine to simulate the Heroku environment locally. This will often replicate the error you're seeing on Heroku, making it easier to fix without pushing changes repeatedly.

Give these steps a shot—chances are one of them will resolve your issue. If you're still stuck, share the exact code from line 1 of app.js and any additional Heroku build logs, and we can dig deeper!

内容的提问来源于stack exchange，提问作者user5506968