Error suddenly appeared when trying to serve a previously functional project locally: Firebase function module not found

Question

Error suddenly appeared when trying to serve a previously functional project locally: Firebase function module not found

After not making any changes to my firebase-related files, I suddenly started encountering the following issue that I just can't seem to figure out:

We were unable to load your functions code. (see above)
   - It appears your code is written in Typescript, which must be compiled before emulation.
   - You may be able to run "npm run build" in your functions directory to resolve this.

This is what my firebase config file looks like:

{
    "functions": {
        "predeploy": "npm --prefix \"$RESOURCE_DIR\" run build",
        "source": "server"
    }
}

Here's a glimpse of my folder structure:

https://i.stack.imgur.com/564N1.png

And here's my tsconfig setup:

{
  "compilerOptions": {
    "module": "commonjs",
    "declaration": true,
    "removeComments": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es6",
    "sourceMap": true,
    "outDir": "./dist"
  },
  "exclude": ["node_modules", "test", "**/*spec.ts"],
  "include": ["src/**/*", "src"]
}

typescript firebase google-cloud-functions

Answer 1

Answer №1

I identified the problem in my tsconfig.json file

When Firebase looks for your function code, it searches in the main property of package.json. In my case, I had:

"main": "dist/index.js",

However, the index.js file was located outside the SRC folder. To resolve an issue with vscode's warnings about the tsconfig file, I added an 'includes' property which ended up causing more problems.

Deleting the includes/excludes from there fixed everything.

This error was easily spotted thanks to the screenshot and tsconfig shown in my initial post.

Answer 2

I identified the problem in my tsconfig.json file

When Firebase looks for your function code, it searches in the main property of package.json. In my case, I had:

"main": "dist/index.js",

However, the index.js file was located outside the SRC folder. To resolve an issue with vscode's warnings about the tsconfig file, I added an 'includes' property which ended up causing more problems.

Deleting the includes/excludes from there fixed everything.

This error was easily spotted thanks to the screenshot and tsconfig shown in my initial post.

Answer 3

Answer №2

By mistake, I ended up importing an uncompiled Typescript file from the main project instead of using it as a package dependency.

This caused confusion because it was actually supposed to be a library file.

Answer 4

By mistake, I ended up importing an uncompiled Typescript file from the main project instead of using it as a package dependency.

This caused confusion because it was actually supposed to be a library file.

Answer 5

Answer №3

For my situation, I had to ensure that tslib was installed in the functions directory before deploying them.

To be candid, I'm not entirely sure why this was necessary. In another project of mine, I never encountered this issue. However, both projects rely heavily on tslib in their compiled code.

This workaround proved effective for me using

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="4236312e2b2002706c726c73">[email protected]</a>

. I am a bit concerned that a future TypeScript update could potentially disrupt things unexpectedly. But for now, it appears to be functioning properly with

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="7b0f020b1e081809120b0f3b4f554b5549">[email protected]</a>

.

To provide some context, I kept encountering errors from firebase-tools such as this one:

Function failed on loading user code. Error message: Error: please examine your function logs to see the error cause: https://cloud.google.com/functions/docs/monitoring/logging#viewing_logs

While checking the cloud terminal, I came across the following message:

Provided module can't be loaded.
Did you list all required modules in the package.json dependencies?
Detailed stack trace: Error: Cannot find module 'tslib'

Answer 6

For my situation, I had to ensure that tslib was installed in the functions directory before deploying them.

To be candid, I'm not entirely sure why this was necessary. In another project of mine, I never encountered this issue. However, both projects rely heavily on tslib in their compiled code.

This workaround proved effective for me using

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="4236312e2b2002706c726c73">[email protected]</a>

. I am a bit concerned that a future TypeScript update could potentially disrupt things unexpectedly. But for now, it appears to be functioning properly with

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="7b0f020b1e081809120b0f3b4f554b5549">[email protected]</a>

.

To provide some context, I kept encountering errors from firebase-tools such as this one:

Function failed on loading user code. Error message: Error: please examine your function logs to see the error cause: https://cloud.google.com/functions/docs/monitoring/logging#viewing_logs

While checking the cloud terminal, I came across the following message:

Provided module can't be loaded.
Did you list all required modules in the package.json dependencies?
Detailed stack trace: Error: Cannot find module 'tslib'

Answer 7

Answer №4

I encountered a specific error due to my failure in running the command npm run build

It became tedious for me to repeatedly execute npm run build every time.

To address this issue, I implemented a watch script within the functions directory that automatically triggers npm run build whenever there are file changes in that folder. This setup proved to be very efficient when testing Firebase emulators locally.

The watch script is structured as shown below:

const chokidar = require('chokidar')
const { execSync } = require('child_process')

const debounce = (func, wait) => {
  let timeout
  return function (...args) {
    const context = this
    clearTimeout(timeout)
    timeout = setTimeout(() => func.apply(context, args), wait)
  }
}

const exec = (cmd) => {
  try {
    const res = execSync(cmd)
    return {
      success: true,
      message: res.toString(),
      err: null
    }
  } catch (err) {
    return {
      success: false,
      message: err.stderr.toString(),
      err
    }
  }
}

const build = () => {
  console.log('building')
  const res = exec('npm run build')
  if (res.success) {
    console.log('build success', res.message)
  } else {
    throw Error(res.err)
  }
}

const buildDebounced = debounce(build, 1000)

chokidar.watch('./src').on('all', () => {
  buildDebounced()
})

As part of this adjustment, modifications were made to .eslintrc.js file:

ignorePatterns: [
  '/lib/**/*',
  'watch.js'
]

To initiate the watch script, simply run node watch.js

If desired, for running the watch script concurrently with the emulators operating in the foreground, I devised a brief bash script called start.sh:

#!/usr/bin/env bash
cd functions || exit
npm run build
# executes watch script in background and silences output
(node watch.js &) &> /dev/null
firebase emulators:start

To trigger the execution of the bash script, utilize the command start.sh

Answer 8

I encountered a specific error due to my failure in running the command npm run build

It became tedious for me to repeatedly execute npm run build every time.

To address this issue, I implemented a watch script within the functions directory that automatically triggers npm run build whenever there are file changes in that folder. This setup proved to be very efficient when testing Firebase emulators locally.

The watch script is structured as shown below:

const chokidar = require('chokidar')
const { execSync } = require('child_process')

const debounce = (func, wait) => {
  let timeout
  return function (...args) {
    const context = this
    clearTimeout(timeout)
    timeout = setTimeout(() => func.apply(context, args), wait)
  }
}

const exec = (cmd) => {
  try {
    const res = execSync(cmd)
    return {
      success: true,
      message: res.toString(),
      err: null
    }
  } catch (err) {
    return {
      success: false,
      message: err.stderr.toString(),
      err
    }
  }
}

const build = () => {
  console.log('building')
  const res = exec('npm run build')
  if (res.success) {
    console.log('build success', res.message)
  } else {
    throw Error(res.err)
  }
}

const buildDebounced = debounce(build, 1000)

chokidar.watch('./src').on('all', () => {
  buildDebounced()
})

As part of this adjustment, modifications were made to .eslintrc.js file:

ignorePatterns: [
  '/lib/**/*',
  'watch.js'
]

To initiate the watch script, simply run node watch.js

If desired, for running the watch script concurrently with the emulators operating in the foreground, I devised a brief bash script called start.sh:

#!/usr/bin/env bash
cd functions || exit
npm run build
# executes watch script in background and silences output
(node watch.js &) &> /dev/null
firebase emulators:start

To trigger the execution of the bash script, utilize the command start.sh

Error suddenly appeared when trying to serve a previously functional project locally: Firebase function module not found

Answer №1

Answer №2

Answer №3

Answer №4

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