npm run dev SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode

I followed the instruction and this is what I get using os: ubuntu 16.04 desktop.

0 info it worked if it ends with ok
1 verbose cli [ '/usr/bin/nodejs', '/usr/bin/npm', 'run', 'dev' ]
2 info using npm@3.5.2
3 info using node@v4.2.6
4 verbose run-script [ 'predev', 'dev', 'postdev' ]
5 info lifecycle ecampus@1.0.0~predev: ecampus@1.0.0
6 silly lifecycle ecampus@1.0.0~predev: no script for predev, continuing
7 info lifecycle ecampus@1.0.0~dev: ecampus@1.0.0
8 verbose lifecycle ecampus@1.0.0~dev: unsafe-perm in lifecycle true
9 verbose lifecycle ecampus@1.0.0~dev: PATH: /usr/share/npm/bin/node-gyp-bin:/opt/lampp/htdocs/ecampus/node_modules/.bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
10 verbose lifecycle ecampus@1.0.0~dev: CWD: /opt/lampp/htdocs/ecampus
11 silly lifecycle ecampus@1.0.0~dev: Args: [ '-c',
11 silly lifecycle   'cross-env NODE_ENV=development webpack --watch --progress --hide-modules' ]
12 silly lifecycle ecampus@1.0.0~dev: Returned: code: 1  signal: null
13 info lifecycle ecampus@1.0.0~dev: Failed to exec dev script
14 verbose stack Error: ecampus@1.0.0 dev: `cross-env NODE_ENV=development webpack --watch --progress --hide-modules`
14 verbose stack Exit status 1
14 verbose stack     at EventEmitter.<anonymous> (/usr/share/npm/lib/utils/lifecycle.js:232:16)
14 verbose stack     at emitTwo (events.js:87:13)
14 verbose stack     at EventEmitter.emit (events.js:172:7)
14 verbose stack     at ChildProcess.<anonymous> (/usr/share/npm/lib/utils/spawn.js:24:14)
14 verbose stack     at emitTwo (events.js:87:13)
14 verbose stack     at ChildProcess.emit (events.js:172:7)
14 verbose stack     at maybeClose (internal/child_process.js:821:16)
14 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:211:5)
15 verbose pkgid ecampus@1.0.0
16 verbose cwd /opt/lampp/htdocs/ecampus
17 error Linux 4.4.0-57-generic
18 error argv "/usr/bin/nodejs" "/usr/bin/npm" "run" "dev"
19 error node v4.2.6
20 error npm  v3.5.2
21 error code ELIFECYCLE
22 error ecampus@1.0.0 dev: `cross-env NODE_ENV=development webpack --watch --progress --hide-modules`
22 error Exit status 1
23 error Failed at the ecampus@1.0.0 dev script 'cross-env NODE_ENV=development webpack --watch --progress --hide-modules'.
23 error Make sure you have the latest version of node.js and npm installed.
23 error If you do, this is most likely a problem with the ecampus package,
23 error not with npm itself.
23 error Tell the author that this fails on your system:
23 error     cross-env NODE_ENV=development webpack --watch --progress --hide-modules
23 error You can get information on how to open an issue for this project with:
23 error     npm bugs ecampus
23 error Or if that isn't available, you can get their info via:
23 error     npm owner ls ecampus
23 error There is likely additional logging output above.
24 verbose exit [ 1, true ]

[orrd]

For anyone having this issue with Homestead or similar environments, I was unable to get Node to upgrade using the typical instructions which are usually

sudo npm install -g npm
sudo npm install -g n
sudo n stable

That still wasn’t changing the version of Node that was being used. I finally found that you have change the /usr/bin/node symlink like this:

sudo ln -sf /usr/local/n/versions/node/<VERSION>/bin/node /usr/bin/node

(Use whatever the highest version is in place of “<VERSION>” from your install options in /usr/local/n/versions/node.

[QWp6t]

@JeffreyWay in package.json, you can alert users who don’t meet minimum nodeJS requirement with…

  "engines": {
    "node": ">= 6.0.0",
  }

(I’m not sure which version is required to run your package; I’m just guessing with 6.0)

You can set engineStrict: true if you want it to actually enforce it instead of just displaying a notice.