TSError: ⨯ Unable to compile TypeScript?

I get this weird error by trying to run a simple script:

class Greeter {
  constructor(public greeting: string) { }
  greet() {
    return "<h1>" + this.greeting + "</h1>";
  }
};

var greeter = new Greeter("Hello, world!");

console.log(greeter.greet());

I did:

$ npm install ts-node -g
$ npm install typescript -g
$ ts-node test.ts

And I get the following error:

                          TSError: ⨯ Unable to compile TypeScript
                          examples/echo.ts (2,7): Duplicate identifier 'Greeter'. (2300)
                          at getOutput (/home/arkotek/.nvm/versions/node/v6.3.1/lib/node_modules/ts-node/src/index.ts:258:17)
                          at /home/arkotek/.nvm/versions/node/v6.3.1/lib/node_modules/ts-node/src/index.ts:267:16
                          at Object.compile (/home/arkotek/.nvm/versions/node/v6.3.1/lib/node_modules/ts-node/src/index.ts:403:17)
                          at loader (/home/arkotek/.nvm/versions/node/v6.3.1/lib/node_modules/ts-node/src/index.ts:289:33)
                          at Object.require.extensions.(anonymous function) [as .ts] (/home/arkotek/.nvm/versions/node/v6.3.1/lib/node_modules/ts-node/src/index.ts:306:14)
                          at Module.load (module.js:458:32)
                          at tryModuleLoad (module.js:417:12)
                          at Function.Module._load (module.js:409:3)
                          at Function.Module.runMain (module.js:575:10)
                          at Object.<anonymous> (/home/arkotek/.nvm/versions/node/v6.3.1/lib/node_modules/ts-node/src/_bin.ts:179:12)

Issue Analytics

State:
Created 7 years ago
Comments:14 (8 by maintainers)

Top GitHub Comments

4reactions

Sayan751commented, Dec 16, 2016

I am also facing this issue while running the test cases for my Aurelia ( + Webpack + TypeScript) app. I have already asked about this in stack overflow: http://stackoverflow.com/questions/41137573/karma-error-config-invalid-config-file. As the TypeScript compilation fails from ts-node, the testing can’t proceed further.

I also tried to do a simple ts-node test/unit/setup.ts, and I faced the similar issue with that as well:

C:\Path\to\my\Website>ts-node test/unit/setup.ts

C:\Users\spal\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:312
          throw new TSError(formatDiagnostics(diagnosticList, cwd, ts, lineOffset))
                ^
TSError: ⨯ Unable to compile TypeScript
Cannot find type definition file for 'dir1'. (2688)
Cannot find type definition file for 'dir2'. (2688)
Cannot find type definition file for 'dir3'. (2688)
Cannot find type definition file for 'lang1'. (2688)
Cannot find type definition file for 'dir4'. (2688)
Cannot find type definition file for 'lang2'. (2688)
Cannot find type definition file for 'maps'. (2688)
Cannot find type definition file for 'valueConverters'. (2688)
Cannot find type definition file for 'views'. (2688)
    at getOutput (C:\Users\spal\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:312:17)
    at C:\Users\spal\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:343:18
    at Object.compile (C:\Users\spal\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:502:17)
    at Module.m._compile (C:\Users\spal\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:406:44)
    at Module._extensions..js (module.js:579:10)
    at Object.require.extensions.(anonymous function) [as .ts] (C:\Users\spal\AppData\Roaming\npm\node_modules\ts-node\src\index.ts:409:12)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Function.Module.runMain (module.js:604:10)

Any suggestion on what I should look for?

1reaction

blakeembreycommented, Aug 3, 2017

Oh, actually, it is your issue. You need to be in the directory to use the correct tsconfig.json file. This works the same as TypeScript. You’re currently using a different tsconfig.json file which is for ES5 and not ES6 - when you run it in the correct directory it uses the tsconfig.json file from there instead.