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:

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