TypeScript formatting

We could improve the TypeScript quality of code by having a clang format. The clang-format tslint tool could standardize the format automagically:

• We can set the clang style for line length, style guide (like Google’s style guide or Mozilla’s style guide for JavaScript)
• Add to the build:src step to autoformat code
• Add test to check the format in step in travis tests

So here are some of the good things that come out of it, it will notify the developer to:

• Remove trailing spaces
• Use a standard indentation
• Style format from developer to developer is consistent
• Makes an attempt to stay within a column space (I usually leave this at 100 col)
• Catch missing semicolons;

[cnishina]

Not a problem. I’ll look into using tslint.

[pbugnion]

While I think that adopting a convention for laying out both Python and JS code is good, I am very wary of code auto-formatters that reformat your code on build. I personally would prefer to use tslint. Beyond personal preferences, I note that this is what JupyterLab uses.

If we run the linting as part of the Travis tests, we could guarantee the quality of code going into the repo.