Error with deploy function to Firebase

I'm trying to deploy function to Firebase

$ npm install firebase-tools
$ login firebase
$ firebase init functions

then $firebase deploy --only functions or $firebase deploy

package.json:

{
  "name": "functions",
  "description": "Cloud Functions for Firebase",
  "scripts": {
    "lint": "eslint .",
    "serve": "firebase serve --only functions",
    "shell": "firebase functions:shell",
    "start": "npm run shell",
    "deploy": "firebase deploy --only functions",
    "logs": "firebase functions:log"
  },
  "dependencies": {
    "firebase-admin": "~5.12.1",
    "firebase-functions": "^1.0.3"
  },
  "devDependencies": {
    "eslint": "^4.12.0",
    "eslint-plugin-promise": "^3.6.0"
  },
  "private": true
}

firebase.json:

{
  "functions": {
    "predeploy": [
      "npm --prefix \"%RESOURCE_DIR%\" run lint"
    ]
  }
}

edited with $RESOURCE_DIR as %RESOURCE_DIR% to avoid:

Error: functions predeploy error: Command terminated with non-zero exit code4294963238

my function index.js:

const functions = require('firebase-functions');
var admin = require('firebase-admin');

admin.initializeApp(functions.config().firebase);
var wrotedata;
exports.Pushtrigger = functions.database.ref('/messages/{messageId}').onWrite((event) => {
    wrotedata = event.data.val();

    admin.database().ref('/pushtokens').orderByChild('uid').once('value').then((alltokens) => {
        var rawtokens = alltokens.val();
        var tokens = [];
        this.processtokens(rawtokens).then((processedtokens) => {

            for (var token in processedtokens) {
                tokens.push(token.devtoken);
            }

            var payload = {
                "notification": {
                    "title": "Notification title",
                    "body": "Notification body",
                    "sound": "default",
                    "click_action": "FCM_PLUGIN_ACTIVITY",
                    "icon": "fcm_push_icon"
                },
                "data": {
                    "message": "value1",
                    "sendername": "value2"
                }
            }
                return admin.messaging().sendToDevice(tokens, payload).then((response) => {
                    console.log('Push notifications');
                }).catch((err) => {
                    console.log(err);
                })             
        })
    })
})

function processtokens(rawtokens) {
    var promise = new Promise((resolve, reject) => {
        var processedtokens = []
        for (token in rawtokens) {
            processedtokens.push(rawtokens[token]);
        }
        resolve(processdatatokens);
    })
    return promise;
}

I've tried:

npm install firebase-admin@latest firebase-functions@latest
npm install -g git://github.com/firebase/firebase-tools#master

but I got:

Error: functions predeploy error: Command terminated with non-zero exit code1

2018-07-12T23_38_09_788Z-debug:

0 info it worked if it ends with ok
1 verbose cli [ 'C:\\Program Files\\nodejs\\node.exe',
1 verbose cli   'C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js',
1 verbose cli   '--prefix',
1 verbose cli   'C:\\Users\\User\\Desktop\\pushcloud\\functions',
1 verbose cli   'run',
1 verbose cli   'lint' ]
2 info using npm@5.6.0
3 info using node@v8.9.4
4 verbose run-script [ 'prelint', 'lint', 'postlint' ]
5 info lifecycle functions@~prelint: functions@
6 info lifecycle functions@~lint: functions@
7 verbose lifecycle functions@~lint: unsafe-perm in lifecycle true
8 verbose lifecycle functions@~lint: PATH: C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\node-gyp-bin;C:\Users\User\Desktop\pushcloud\functions\node_modules\.bin;C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files (x86)\Embarcadero\Studio\16.0\bin;C:\Users\Public\Documents\Embarcadero\Studio\16.0\Bpl;C:\Program Files (x86)\Embarcadero\Studio\16.0\bin64;C:\Users\Public\Documents\Embarcadero\Studio\16.0\Bpl\Win64;C:\Inprise\vbroker\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Python27;C:\Python27\Scripts\;C:\Users\User\AppData\Local\Programs\Python\Python35-32;C:\Users\User\AppData\Local\Programs\Python\Python35-32\Scripts;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;C:\Emgu\emgucv-windesktop 3.1.0.2282\bin\x86;C:\Program Files (x86)\Skype\Phone\;C:\php;C:\Apache2;C:\Apache2\bin;C:\Program Files\dotnet\;C:\WINDOWS\system32\config\systemprofile\.dnx\bin;C:\Program Files\Microsoft DNX\Dnvm\;C:\Program Files\Java\jdk1.8.0_151\bin;C:\Users\User\AppData\Local\Android\Sdk\platform-tools;C:\Program Files\nodejs\;C:\Program Files\Git\cmd;C:\Program Files\Git\usr\bin;C:\Go\bin;C:\Program Files (x86)\Java\jre1.8.0_101\bin;C:\Users\User\AppData\Local\Programs\Python\Python35-32\Scripts\;C:\Users\User\AppData\Local\Programs\Python\Python35-32\;C:\Users\User\AppData\Local\Microsoft\WindowsApps;C:\Program Files\Microsoft VS Code\bin;C:\Users\User\AppData\Roaming\npm;C:\Users\User\go\bin
9 verbose lifecycle functions@~lint: CWD: C:\Users\User\Desktop\pushcloud\functions
10 silly lifecycle functions@~lint: Args: [ '/d /s /c', 'eslint .' ]
11 silly lifecycle functions@~lint: Returned: code: 1  signal: null
12 info lifecycle functions@~lint: Failed to exec lint script
13 verbose stack Error: functions@ lint: `eslint .`
13 verbose stack Exit status 1
13 verbose stack     at EventEmitter.<anonymous> (C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\index.js:285:16)
13 verbose stack     at emitTwo (events.js:126:13)
13 verbose stack     at EventEmitter.emit (events.js:214:7)
13 verbose stack     at ChildProcess.<anonymous> (C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\lib\spawn.js:55:14)
13 verbose stack     at emitTwo (events.js:126:13)
13 verbose stack     at ChildProcess.emit (events.js:214:7)
13 verbose stack     at maybeClose (internal/child_process.js:925:16)
13 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:209:5)
14 verbose pkgid functions@
15 verbose cwd C:\Users\User\Desktop\pushcloud
16 verbose Windows_NT 10.0.16299
17 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "--prefix" "C:\\Users\\User\\Desktop\\pushcloud\\functions" "run" "lint"
18 verbose node v8.9.4
19 verbose npm  v5.6.0
20 error code ELIFECYCLE
21 error errno 1
22 error functions@ lint: `eslint .`
22 error Exit status 1
23 error Failed at the functions@ lint script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 1, true ]

it looks like something wrong with code, because deploy of default Hello from Firebase! is successful

edit:

In case of edit in firebase.json form \"%RESOURCE_DIR%\" to "%RESOURCE_DIR%" error is

Error: There was an error loading firebase.json: Unexpected token '%' "npm --prefix "%RESOURCE_DIR%" run lint"

If I remove line from firebase.json and run npm --prefix "%RESOURCE_DIR%" run lint in terminal:

npm ERR! enoent ENOENT: no such file or directory, open 'C:\Users\User\Desktop\pushcloud\%RESOURCE_DIR%\package.json'
npm ERR! enoent This is related to npm not being able to find a file.
npm ERR! enoent
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\User\AppData\Roaming\npm-cache\_logs\2018-07-13T11_33_25_593Z-debug.log

but directory folder exist as %RESOURCE_DIR% with folder etc, when package.json located in functions directory. If I relocate it to %RESOURCE_DIR%:

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! functions@ lint: `eslint .`
npm ERR! Exit status 1
npm ERR! Failed at the functions@ lint script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm WARN Local package.json exists, but node_modules missing, did you mean to install?
npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\User\AppData\Roaming\npm-cache\_logs\2018-07-13T11_50_15_739Z-debug.log

and with $ firebase deploy --only functions:

C:\Users\User\Desktop\pushcloud\functions\index.js
   9:5   error    Expected catch() or return                  promise/catch-or-return
   9:80  error    Each then() should return a value or throw  promise/always-return
  12:9   error    Expected catch() or return                  promise/catch-or-return
  12:9   warning  Avoid nesting promises                      promise/no-nesting
  33:24  warning  Avoid nesting promises                      promise/no-nesting
  33:24  warning  Avoid nesting promises                      promise/no-nesting
  33:77  error    Each then() should return a value or throw  promise/always-return

✖ 7 problems (4 errors, 3 warnings)

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! functions@ lint: `eslint .`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the functions@ lint script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\User\AppData\Roaming\npm-cache\_logs\2018-07-13T11_51_50_784Z-debug.log
Error: functions predeploy error: Command terminated with non-zero exit code1

Your predeploy flag npm --prefix \"%RESOURCE_DIR%\" run lint is causing your issues.

If you run npm --prefix "%RESOURCE_DIR%" run lint in your terminal, does it run correctly without error?

If you remove that line from your firebase.json then it should deploy without issue.

EDIT

Check the error message you're receiving, it has the answer for you. Your code linter is failing, and you'll need to fix those errors before you can deploy.

9:5   error    Expected catch() or return                  promise/catch-or-return
9:80  error    Each then() should return a value or throw  promise/always-return
12:9   error    Expected catch() or return                  promise/catch-or-return
12:9   warning  Avoid nesting promises                      promise/no-nesting
33:24  warning  Avoid nesting promises                      promise/no-nesting
33:24  warning  Avoid nesting promises                      promise/no-nesting
33:77  error    Each then() should return a value or throw  promise/always-return

I've taken a quick look at your code, and I think I've cleaned it up. Additionally you didn't need to make processtokens a promise, it's a synchronous functions.

const functions = require('firebase-functions');
var admin = require('firebase-admin');

admin.initializeApp(functions.config().firebase);
var wrotedata;
exports.Pushtrigger = functions.database.ref('/messages/{messageId}').onWrite((event) => {
    wrotedata = event.data.val();

    return admin.database().ref('/pushtokens')
      .orderByChild('uid')
      .once('value')
      .then((alltokens) => {
        var rawtokens = alltokens.val();
        var tokens = [];

        var processedtokens = this.processtokens(rawtokens);

        for (var token in processedtokens) {
            tokens.push(token.devtoken);
        }

        var payload = {
            "notification": {
                "title": "Notification title",
                "body": "Notification body",
                "sound": "default",
                "click_action": "FCM_PLUGIN_ACTIVITY",
                "icon": "fcm_push_icon"
            },
            "data": {
                "message": "value1",
                "sendername": "value2"
            }
        };

        return admin.messaging().sendToDevice(tokens, payload).then((response) => {
            console.log('Push notifications');
        }).catch((err) => {
            console.log(err);
        })        
    })
})

function processtokens(rawtokens) {
    var processedtokens = []
    for (token in rawtokens) {
        processedtokens.push(rawtokens[token]);
    }

    return processdatatokens;
}