Error: TSError: ⨯ Unable to compile TypeScript

Question

I am facing the problem:

My Project is built on Angular4 with typescript, e2e testing with protractor & karma.

Travis-ci has this error:

[03:34:54] E/launcher - Error: TSError: ⨯ Unable to compile TypeScript
Cannot find type definition file for 'jasmine'. (2688)
Cannot find type definition file for 'node'. (2688)
e2e/app.e2e-spec.ts (1,32): Cannot find module './app.po'. (2307)
e2e/app.e2e-spec.ts (4,1): Cannot find name 'describe'. (2304)
e2e/app.e2e-spec.ts (7,3): Cannot find name 'beforeEach'. (2304)
e2e/app.e2e-spec.ts (11,3): Cannot find name 'it'. (2304)
e2e/app.e2e-spec.ts (13,5): Cannot find name 'expect'. (2304)

The command "ng e2e" exited with 4.

My tsconfig.json:

{
  "compileOnSave": false,
  "compilerOptions": {
    "outDir": "./dist/out-tsc",
    "baseUrl": ".",
    "paths": {
      "*": ["./node_modules/*", "*"]
    },
    "sourceMap": true,
    "declaration": false,
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es5",
    "types": [ "node", "jasmine" ],
    "typeRoots": [
      "./node_modules/@types"
    ],
    "lib": [
      "es2016",
      "dom"
    ]
  }
}

My tsconfig.spec.json:

{
  "compilerOptions": {
    "sourceMap": true,
    "declaration": false,
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "lib": [
      "es2016",
      "dom"
    ],
    "outDir": "../out-tsc/spec",
    "module": "commonjs",
    "target": "es5",
    "baseUrl": "",
    "types": [
      "jasmine",
      "node"
    ],
    "typeRoots": [
      "../node_modules/@types"
    ]
  },
  "files": [
    "test.ts"
  ],
  "include": [
    "**/*.spec.ts"
  ]
}

Node v6.10.3

npm v3.10.10

Please help me.

Answer 1

I had met same issue. First I remove ts-node and typescript from package.json. then,

npm install ts-node --save-dev
npm install typescript -g 
npm install typescript --save-dev

Answer 2

I came here looking for a solution for a similar error when I updated my typescript version, Mine was not a new project, I am running an angular2 project with "@angular/cli": "1.2.0". I updated my typescript version from 2.0.3 to 2.7.2 and then I was getting similar issues like below while running ng e2e.

Error: TSError: ⨯ Unable to compile TypeScript
Cannot find type definition file for 'core-js'. (2688)
Cannot find type definition file for 'grecaptcha'. (2688)
Cannot find type definition file for 'jasmine'. (2688)
Cannot find type definition file for 'moment-timezone'. (2688)
Cannot find type definition file for 'node'. (2688)
Cannot find type definition file for 'q'. (2688)

The proposed solutions in this post didn't work for me.

I fixed it by updating ts-node to 5.0.1. Versions above this were giving errors like the one below while running ng e2e even though I had experimentalDecorators set to true in tsconfig.json:

error TS1219: Experimental support for decorators is a feature that is subject to change in a future release. Set the 'experimentalDecorators' option to remove this warning

Apart from the above change, I also changed few lines in protractor.conf.js

Changed:

beforeLaunch: function () {
    require('ts-node').register({
        project: 'e2e'
    });
},

to

beforeLaunch: function () {
   require('ts-node/register')
}

This is for people who may stumble into this post and the proposed solution doesn't work for them.

Answer 3

if only the "npm install -g typescript" doesn't work.

try to do "tsc" in the project folder

Answer 4

I also faced the same issue, find the error has been attached

Solution: Check the tsconfig.json and set "allowJs": false

Answer 5

This is my solution for this issue: - Run this command

npm install -save-dev typescript@2.3.4

npm WARN venminder_gui@0.0.1 No repository field.
npm WARN venminder_gui@0.0.1 No license field.

+ typescript@2.3.4
updated 1 package and audited 657 packages in 2.539s
found 0 vulnerabilities