Getting error while serving angular universal locally in firebase

mukeshkumarbehera@Mukeshs-MacBook-Air functions % firebase serve --only functions,hosting
⚠  Your requested "node" version "8" doesn't match your global version "12"
i  functions: Watching "/Users/mukeshkumarbehera/Desktop/myWebsite/programingwizard/functions" for Cloud Functions...
i  hosting: Serving hosting files from: public
✔  hosting: Local server: http://localhost:5000
⚠  Error: Cannot find module '/Users/mukeshkumarbehera/Desktop/myWebsite/programingwizard/functions/lib/index.js'. Please verify that the package.json has a valid "main" entry
    at tryPackage (internal/modules/cjs/loader.js:323:19)
    at Function.Module._findPath (internal/modules/cjs/loader.js:681:18)
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:944:27)
    at Function.Module._load (internal/modules/cjs/loader.js:840:27)
    at Module.require (internal/modules/cjs/loader.js:1019:19)
    at require (internal/modules/cjs/helpers.js:77:18)
    at /usr/local/lib/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:664:33
    at Generator.next (<anonymous>)
    at fulfilled (/usr/local/lib/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:5:58)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
⚠  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.
⚠  Error: Cannot find module '/Users/mukeshkumarbehera/Desktop/myWebsite/programingwizard/functions/lib/index.js'. Please verify that the package.json has a valid "main" entry
    at tryPackage (internal/modules/cjs/loader.js:323:19)
    at Function.Module._findPath (internal/modules/cjs/loader.js:681:18)
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:944:27)
    at Function.Module._load (internal/modules/cjs/loader.js:840:27)
    at Module.require (internal/modules/cjs/loader.js:1019:19)
    at require (internal/modules/cjs/helpers.js:77:18)
    at /usr/local/lib/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:664:33
    at Generator.next (<anonymous>)
    at fulfilled (/usr/local/lib/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:5:58)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
⚠  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.

[sapardo10]

I just created the template project for firebase functions and ran into the same problem. The thing for me was that I didn’t know you require to transpile TS to JS before running the emulator, so, before running: firebase emulators:start You should run: npm run build

I hope this helped someone 😛 Link to documentation: https://firebase.google.com/docs/functions/typescript?authuser=0#emulating_typescript_functions

[smasinde]

npm run build

this should be run in the functions folder

it says it in his error code here

• 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.

ran into the same problem and this worked. Keep in mind you may have to resolve some node version conflicts if you are using a version other than the one in the functions package.json file. Mine was on 12