Upgrade to TypeScript 2.4

[kitsonk]

This PR upgrades Deno to TypeScript 2.4.

ts-morph does not yet support TypeScript 2.4 (@dsherret), so there were some changes ts_library_builder to allow it to use the library files from the version of TypeScript that it comes bundled with, which is used to validate the output library file. Deno will still use 2.4 and the associated library files. I also fixed several linting issues with ts_library_builder as well.

[dsherret]

Hey @kitsonk, I can get a patch version (1.3.3) out that adds ts 3.4 support (will do so tomorrow).

There were some breaking changes in ts 3.4 and so I added ts 3.4 support to my upcoming 2.0 (wanted to make a couple small api changes to accommodate it on my end too), but now I'm delayed on releasing it for a couple weeks... so I'll do a custom fix for ts 3.4 in ts-morph 1.3.3.

[dsherret]

@kitsonk also, thanks for keeping me in the loop about this! It helps to guide my priorities :)

[ztplz]

Hmm, 2.4 => 3.4.

[kitsonk]

DOH! Yes... Thanks @ztplz

[ry]

Thanks - LGTM

[dsherret]

@kitsonk FYI, released ts-morph 1.3.3 which has ts 3.4 support.

Also, just looked at the change you made and that looked good to do anyway.

[JamesHenry]

@kitsonk Just checking, was there any reason you didn't update the @typescript-eslint deps as part of this?

There were some significant performance improvements added in 1.5.0 and then TypeScript 3.4 support was made official in 1.6.0

[kitsonk]

@JamesHenry we have just been pinning all our dependencies and only upgrading when we believe there is something of value. I will raise a PR to update those.