run start:dev failes Unexpected identifier in concurrently

Question

I'm rather new to the nodejs world and having trouble with some basics ,

when I do npm install it shows a few warn messages but complete it .

when I do npm build it works fine

but when I do run start:dev it crashes with this error message :

concurrently\bin\concurrently.js:140
let lastColor;
^^^^^^^^^
SyntaxError: Unexpected identifier
at exports.runInThisContext (vm.js:73:16)
at Module._compile (module.js:443:25)
at Object.Module._extensions..js (module.js:478:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Function.Module.runMain (module.js:501:10)
at startup (node.js:129:16)
at node.js:814:3

npm ERR! Windows_NT 6.3.9600
npm ERR! argv "C:\\Program Files (x86)\\nodejs\\\\node.exe" "C:\\Program Files (x86)\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "run" "start:dev"
npm ERR! node v0.12.2
npm ERR! npm  v2.7.4
npm ERR! code ELIFECYCLE
npm ERR! izi-backend@0.0.1 start:dev: `concurrently --handle-input "wait-on dist/main.js && nodemon" "tsc -w -p tsconfig.build.json" `
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the izi-backend@0.0.1 start:dev script 'concurrently --handle-input "wait-on dist/main.js && nodemon" "tsc -w -p tsconfig.build.json" '.
npm ERR! This is most likely a problem with the izi-backend package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     concurrently --handle-input "wait-on dist/main.js && nodemon" "tsc -w -p tsconfig.build.json"
npm ERR! You can get their info via:
npm ERR!     npm owner ls izi-backend
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     C:\dev\iziMobile\izi-server\npm-debug.log

where npm run start:dev is defined as :

"start:dev": "concurrently --handle-input \"wait-on dist/main.js && nodemon\" \"tsc -w -p tsconfig.build.json\" "

also printing out npm-debug.log:

0 info it worked if it ends with ok 1 verbose cli [ 'C:\Program Files (x86)\nodejs\\node.exe', 1 verbose cli 'C:\Program Files (x86)\nodejs\node_modules\npm\bin\npm-cli.js', 1 verbose cli 'run', 1 verbose cli 'start:dev' ] 2 info using npm@2.7.4 3 info using node@v0.12.2 4 verbose node symlink C:\Program Files (x86)\nodejs\node.exe 5 verbose run-script [ 'prestart:dev', 'start:dev', 'poststart:dev' ] 6 info prestart:dev izi-backend@0.0.1 7 info start:dev izi-backend@0.0.1 8 verbose unsafe-perm in lifecycle true 9 info izi-backend@0.0.1 Failed to exec start:dev script 10 verbose stack Error: izi-backend@0.0.1 start:dev: concurrently --handle-input "wait-on dist/main.js && nodemon" "tsc -w -p tsconfig.build.json" 10 verbose stack Exit status 1 10 verbose stack at EventEmitter. (C:\Program Files (x86)\nodejs\node_modules\npm\lib\utils\lifecycle.js:213:16) 10 verbose stack at EventEmitter.emit (events.js:110:17) 10 verbose stack at ChildProcess. (C:\Program Files (x86)\nodejs\node_modules\npm\lib\utils\spawn.js:14:12) 10 verbose stack at ChildProcess.emit (events.js:110:17) 10 verbose stack at maybeClose (child_process.js:1015:16) 10 verbose stack at Process.ChildProcess._handle.onexit (child_process.js:1087:5) 11 verbose pkgid izi-backend@0.0.1 12 verbose cwd C:\dev\iziMobile\izi-server 13 error Windows_NT 6.3.9600 14 error argv "C:\Program Files (x86)\nodejs\\node.exe" "C:\Program Files (x86)\nodejs\node_modules\npm\bin\npm-cli.js" "run" "start:dev" 15 error node v0.12.2 16 error npm v2.7.4 17 error code ELIFECYCLE 18 error izi-backend@0.0.1 start:dev: concurrently --handle-input "wait-on dist/main.js && nodemon" "tsc -w -p tsconfig.build.json" 18 error Exit status 1 19 error Failed at the izi-backend@0.0.1 start:dev script 'concurrently --handle-input "wait-on dist/main.js && nodemon" "tsc -w -p tsconfig.build.json" '. 19 error This is most likely a problem with the izi-backend package, 19 error not with npm itself. 19 error Tell the author that this fails on your system: 19 error concurrently --handle-input "wait-on dist/main.js && nodemon" "tsc -w -p tsconfig.build.json" 19 error You can get their info via: 19 error npm owner ls izi-backend 19 error There is likely additional logging output above. 20 verbose exit [ 1, true ]<

Concurrently is a package I take in packages.json so I doubt there is really an error there...

Am I missing anything ? Any help will do at this point

Answer 1

Node v0.12.2 does not support the let declarations.

See here for the full version support matrix.

Answer 2

You are using node version v0.12.2. let syntax is not supported.

From node.green you can see that let is supported from Node v6.4.x