Cannot use/import npm packages in Meteor - meteor

Question

I am not able to do:
import SimpleSchema from 'simpl-schema';
or to import any other npm package with this command. I have already installed the package via meteor npm install --save simpl-schema.
I have also tried to import other npm dependencies like:
import moment from 'moment';
Therefore, I think that I generally missed something important to be able to require NPM packages in my client-side code or that I am using a wrong structure?
I get the error:
Uncaught SyntaxError: Unexpected identifier
in the browser console.
Edit
I have called meteor npm install before running the app.
If I code this line import moment from 'moment'; on a server side js-file, I get the following error:
app\server\startup\profilemanagement.js:1
(function(NPM,Assets){(function(){import moment from 'moment';
SyntaxError: Unexpected token import at C:...meteor\local\build\programs\server\boot.js:392:18 at
Array.forEach () at Function..each..forEach
(C:...meteor\packages\meteor-tool\1.6.0:1\mt-os.windows.x86_64\dev_bundle\server-lib\node_modules\underscore\underscore.js:79:11) at C:...meteor\local\build\programs\server\boot.js:220:5 at
C:...meteor\local\build\programs\server\boot.js:463:5 at
Function.run
(C:...meteor\local\build\programs\server\profile.js:510:12) at
C:...meteor\local\build\programs\server\boot.js:462:11
I am not sure if I installed the babel packages correctly. I think something went wrong there. Here is my package.json:
{
"dependencies": {
"abbrev": "^1.1.0",
"addressparser": "^1.0.1",
"ajv": "^5.2.2",
"ansi-regex": "^3.0.0",
"aproba": "^1.2.0",
"are-we-there-yet": "^1.1.4",
"asn1": "^0.2.3",
"assert-plus": "^1.0.0",
"asynckit": "^0.4.0",
"aws-sign2": "^0.7.0",
"aws4": "^1.6.0",
"babel-runtime": "^6.26.0",
"balanced-match": "^1.0.0",
"bcrypt": "^1.0.3",
"bcrypt-pbkdf": "^1.0.1",
"block-stream": "0.0.9",
"boom": "^5.2.0",
"brace-expansion": "^1.1.8",
"buildmail": "^4.0.1",
"caseless": "^0.12.0",
"chart.js": "^2.7.0",
"chartjs-color": "^2.2.0",
"cloudinary": "^1.9.0",
"co": "^4.6.0",
"code-point-at": "^1.1.0",
"color-convert": "^1.9.0",
"color-name": "^1.1.3",
"combined-stream": "^1.0.5",
"concat-map": "0.0.1",
"console-control-strings": "^1.1.0",
"core-js": "^2.5.1",
"core-util-is": "^1.0.2",
"cryptiles": "^3.1.2",
"dashdash": "^1.14.1",
"debug": "^3.0.1",
"deep-extend": "^0.5.0",
"delayed-stream": "^1.0.0",
"delegates": "^1.0.0",
"ecc-jsbn": "^0.1.1",
"extend": "^3.0.1",
"extsprintf": "^1.3.0",
"fast-deep-equal": "^1.0.0",
"fontawesome": "^4.7.2",
"forever-agent": "^0.6.1",
"form-data": "^2.3.1",
"fs.realpath": "^1.0.0",
"fstream": "^1.0.11",
"fstream-ignore": "^1.0.5",
"gauge": "^2.7.4",
"getpass": "^0.1.7",
"glob": "^7.1.2",
"graceful-fs": "^4.1.11",
"har-schema": "^2.0.0",
"har-validator": "^5.0.3",
"has-unicode": "^2.0.1",
"hawk": "^6.0.2",
"hoek": "^4.2.0",
"http-signature": "^1.2.0",
"iconv-lite": "^0.4.19",
"inflight": "^1.0.6",
"inherits": "^2.0.3",
"ini": "^1.3.4",
"is-fullwidth-code-point": "^2.0.0",
"is-typedarray": "^1.0.0",
"isarray": "^2.0.2",
"isstream": "^0.1.2",
"jasny-bootstrap": "^3.1.3",
"jodid25519": "^1.0.2",
"jsbn": "^1.1.0",
"json-schema": "^0.2.3",
"json-schema-traverse": "^0.3.1",
"json-stable-stringify": "^1.0.1",
"json-stringify-safe": "^5.0.1",
"jsonify": "0.0.0",
"jsprim": "^1.4.1",
"libbase64": "^0.2.0",
"libmime": "^3.1.0",
"libqp": "^1.1.0",
"lodash": "^4.17.4",
"mailcomposer": "^4.0.2",
"meteor-node-stubs": "^0.2.11",
"mime-db": "^1.30.0",
"mime-types": "^2.1.17",
"minimatch": "^3.0.4",
"minimist": "^1.2.0",
"mkdirp": "^0.5.1",
"moment": "^2.18.1",
"ms": "^2.0.0",
"nan": "^2.7.0",
"node-pre-gyp": "^0.6.37",
"nodemailer": "^4.1.0",
"nodemailer-fetch": "^2.1.0",
"nodemailer-shared": "^2.0.0",
"nopt": "^4.0.1",
"npmlog": "^4.1.2",
"number-is-nan": "^1.0.1",
"oauth-sign": "^0.8.2",
"object-assign": "^4.1.1",
"object-inspect": "^1.3.0",
"object-keys": "^1.0.11",
"once": "^1.4.0",
"os-homedir": "^1.0.2",
"os-tmpdir": "^1.0.2",
"osenv": "^0.1.4",
"path-is-absolute": "^1.0.1",
"path-parse": "^1.0.5",
"performance-now": "^2.1.0",
"process-nextick-args": "^1.0.7",
"punycode": "^2.1.0",
"q": "^1.5.0",
"qs": "^6.5.1",
"rc": "^1.2.1",
"readable-stream": "^2.3.3",
"regenerator-runtime": "^0.11.0",
"request": "^2.82.0",
"resolve": "^1.4.0",
"resumer": "0.0.0",
"rimraf": "^2.6.2",
"safe-buffer": "^5.1.1",
"semver": "^5.4.1",
"set-blocking": "^2.0.0",
"signal-exit": "^3.0.2",
"sntp": "^2.0.2",
"sshpk": "^1.13.1",
"string-width": "^2.1.1",
"string.prototype.trim": "^1.1.2",
"string_decoder": "^1.0.3",
"stringstream": "0.0.5",
"strip-ansi": "^4.0.0",
"strip-json-comments": "^2.0.1",
"sweetalert": "^1.1.3",
"tape": "^4.8.0",
"tar": "^4.0.1",
"tar-pack": "^3.4.0",
"through": "^2.3.8",
"tough-cookie": "^2.3.2",
"tunnel-agent": "^0.6.0",
"tweetnacl": "^1.0.0",
"uid-number": "0.0.6",
"util-deprecate": "^1.0.2",
"uuid": "^3.1.0",
"verror": "^1.10.0",
"wide-align": "^1.1.2",
"wow.js": "^1.2.2",
"wrappy": "^1.0.2",
"yallist": "^3.0.2"
}
}
Second edit
It seems to be that (maybe since the last update?) I have a major issue with the meteor installation and its npm dependencies. I am not able to create a new meteor project due to this error:
Error: Error: Could not install npm dependencies for test-packages:
Command failed: C:\WINDOWS\system32\cmd.exe /c
C:\Users...\AppData\Local.meteor\packages\meteor-tool\1.6.0._1\mt-os.windows.x86_64\dev_bundle\bin\npm.cmd
install npm ERR! code ENOGIT npm ERR! No git binary found in $PATH npm
ERR! npm ERR! Failed using git. npm ERR! Please check if you have git
installed and in your PATH.
You can check this error here:
https://github.com/meteor/meteor/issues/8585. It tells that me that no Npm dependencies can be installed because of not finding the Git-path.
However, the solutiuon to reinstall Git did not work for me. So, I think something went generally wrong since the last meteor update. Maybe the only solution is to reinstall meteor completely or use an older version? I started this project from my computer with an older meteor version and uninstalling and reinstalling Babel did not make any difference.

Answer 1

Ok, got it! Although I don´t know exactly what produced the error, I could solve the issue by creating a new meteor project with the --bare flag (so now I know that all npm dependencies are installed correctly to ensure that I can use 'import') and copied my code into the project. However, than I got another error message which told me that my bootstrap is not compatible with my jquery version. Before solving this, I had to delete codemirror in my client/vendor folder, which produces another error
Uncaught Error: Cannot find module ‘…/…/lib/codemirror’
Than I installed jquery#2.2.4 plus all required datatable npm dependencies I use in my code to keep the compatibility of my applied bootstrap and jquery. Now I can use import SimpleSchema from 'simpl-schema' and all other imports and no more errors occure.
So lastly, some npm and/or packages were wrong and the initial error could be solved by creating a new meteor project. The other errors were related to bootstrap/jquery compatibility and codemirror.