Using createProgram outside node environment throws unhelpful exception message

When running `createProgram` from inside my angular app I'm thrown the 'ts.sys is undefined' error. This error is not helpful since I'm not given the reason for it. It took me a lot of time researching and eventually a question on SO (https://stackoverflow.com/questions/52969177/typescript-createprogram-throwing-ts-sys-is-undefined) to get the answer. A more elaborate error message would've had been of great help. **TypeScript Version:** 3.1.3 **Search Terms:** 'ts.sys is undefined' **Code** ```ts try { createProgram(Utils.getFileNames(), { lib: ['lib.es6.d.ts'] // target: ScriptTarget.ES5, // module: ModuleKind.CommonJS }); } catch (ex) { debugger; } ``` **Expected behavior:** An exception message explaining I should run this code from node environment or pass my own compiler. **Actual behavior:** Throws 'ts.sys is undefined'