GCP Cloud Functions 在我的 package.json 中“找不到模块‘express’”

Question

I'm trying to deploy a GCP cloud function from source code (a mirrored git repo). Cloud Function deploy seems to be finding my index.js properly (which contains the function handler), but fails with the Code in file index.js can't be loaded. Cannot find module 'express' Code in file index.js can't be loaded. Cannot find module 'express' error that many others have posted about. My package.json file definitely contains express, however:

{
  ...
  "dependencies": {
    "@google-cloud/speech": "^2.3.1",
    "@google-cloud/storage": "^2.5.0",
    "@sentry/node": "^5.4.3",
    "cors": "^2.8.5",
    "express": "4.17.1",
    "googleapis": "45.0.0",
    "moment": "^2.24.0",
    "stripe": "^7.1.0"
  },
  ...
}

My package.json is in the project root, and my code exposing the function itself is in /app/index.js . What could I be doing wrong here?

Edit: I was able to reproduce this with a very simple app. The app only contains 4 files:

app/index.js
.gitignore
package.json
yarn.lock

// package.json
{
  "name": "cloud-functions-test",
  "version": "1.0.0",
  "main": "app/index.js",
  "repository": "git@github.com:roballsopp/cloud-functions-test.git",
  "author": "rob <rca06d@my.fsu.edu>",
  "license": "MIT",
  "dependencies": {
    "express": "^4.17.1"
  }
}

// index.js
const express = require('express');

const app = express();
app.get('/health', function (req, res) {
    res.status(200).send({ message: 'All good!' });
});

exports.testApp = app;

I pushed this to github, set up a mirrored repo in GCP, and deployed an HTTP cloud function with it. All settings for the deployment are default, except I set "Repository" to the name of my repo as shown in Cloud Source Repositories, "Function to execute" to testApp , and "Directory with source code" to /app .

Answer 1

When we deploy a Cloud Function from data contained in a Git repo, we have the opportunity to specify the directory with source code . It is believed that this causes the deployment of that directory (and likely subordinate directories). In this story, where we have:

app
  index.js
package.json

and we specified the "directory with source" as /app then what was actually deployed did not include the package.json . With no package.json there was no explicit dependencies and hence no knowledge of a dependency on express .

See also:

• Deploying Cloud Functions from Cloud Source Repositories