CODEWITHSUNDEEP
node.jstypescript
infodev
infodev

Reputation: 5235

importing class in Node js with typescript

I would import class in nodejs and use it in app.ts

var nano = require("nano");
import { EnvConfig } from './envConfig.service';
let config = new EnvConfig();
const dbCredentials: any = config.appEnv.getServiceCreds('dataservices');
export const nanodb = nano({
  url: dbCredentials.url,
});
export const nanodbCockpitLight = nanodb.use('data');
console.log(dbCredentials);

When I try to compile I get this error.

import { EnvConfig } from './envConfig.service';
       ^
SyntaxError: Unexpected token {

I have created the tsconfig file :

{
  "compilerOptions": {
    "module": "commonjs",
    "declaration": false,
    "noImplicitAny": false,
    "removeComments": true,
    "noLib": false,
    "allowSyntheticDefaultImports": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es6",
    "sourceMap": true,
    "allowJs": true,
    "outDir": "./dist",
    //"baseUrl": "src" // Attention !! nécessite l'utilisation d'un loader de module node pour fonctionner sur node
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules", "**/*.spec.ts"]
}

I get this warning

No inputs were found in config file 'c:/Users/EHHD05911.COMMUN/Documents/cockpitLight/DB mananger/tsconfig.json'. Specified 'include' paths were '["src//"]' and 'exclude' paths were '["node_modules","/.spec.ts"]'

Upvotes: 0

Views: 3297

Answers (5)

nwayve
nwayve

Reputation: 2331

I suspect whatever you're importing has typescript syntax (strong typing and such), and so running node directly won't work. You need to run tsc first, which will transpile everything to javascript in a dist folder, and then run node dist/app.js.

This is a bit cumbersome though, which is why there is ts-node. It's exactly what it sounds like, a node REPL for typescript. You should be able to run ts-node src/app.ts.

Upvotes: 1

Sunil Patel
Sunil Patel

Reputation: 265

You cannot run node app.ts file directly that won't work You need transpiler like babel js or typescript compiler tsc so first transpile to js file and then run node app.js

Upvotes: 2

Amit Bhoyar
Amit Bhoyar

Reputation: 1057

Use babel js which is a toolchain that is mainly used to convert ECMAScript 2015+ code into a backwards compatible version of JavaScript in current and older browsers or environments.

package.json

"dependencies": {
"@babel/polyfill": "^7.0.0",
}

"babel": {
"presets": [
  "@babel/preset-env"
]

},

"scripts": {
    "start": "server.js --exec babel-node",
}

https://babeljs.io/docs

This will enable/resolve your import statements.

Upvotes: -1

Gabriel Balsa Cantú
Gabriel Balsa Cantú

Reputation: 2022

You're using .js extension, you need .ts extension, e.g.: app.ts instead of app.js.

Make sure you have typescript either in npm global or in dev dependencies.

Upvotes: 1

Loic Coenen
Loic Coenen

Reputation: 853

import { something } is a typescript syntax, it won't work in a .js file. That is a separate language. Try using require instead.

Upvotes: -1

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