Angular CLI - Typescript throws: Cannot read property 'length' of undefined

Question

I run in angular 4 project with ng serve and i get error

Cannot read property \'length\' of undefined

but I don\'t have any property length in

Answer 1

You might be missing one or more files that typescript is trying to process. To find out which file you are missing just add

console.log(fileName);

at the starting of the createSourceFile function at node_modules/typescript/lib/typescript.js file.