Typescript

[shekharkhedekar]

Overview

Adds typescript and converts all js files to ts files.

This adds a build step, see package.json for details.

Verification

• Made sure the tsc build passed and tests passed
• npm link into a sample app to verify functionality

Future Work

• Clean up all instances of as casting. This was mostly done because this.ftp could either be PromiseFtp or PromiseSftp, and those types do not play well with each other. The code is functionally the same, but the typescript could be cleaned up in this area.

[shekharkhedekar]

@simonh1000 took another fresh pass on this with a priority to minimizing any changes to the library. Instead, I just focused on converting to TS. LMK what you think

[cyrdam]

this.ftp could either be PromiseFtp or PromiseSftp

As long as there is a test case for both and the result is the same it should be fine to use the as.