all: add typescript to backend

[acharb]

WHAT
add typescript support to the backend. For this PR just adding the initial typescript infra changes needed, following PRs will refactor the backend/*.js files to typescript.

part of #197

WHY
using typescript with the typescript compiler will notify devs at compile time of type errors + reduce bugs. Also SDF js projects are primarily using typescript, so brings this project inline with our other ones.

note: for running the backend locally I chose to use ts-node, so that you can run it with one command and not have to create new files. But for production using the tsc compiler + node because ts-node is advised not for production use.

[stellar-jenkins]

Preview deployed to development environment: https://dashboard.prototypes.kube001.services.stellar-ops.com

[stellar-jenkins]

Preview deployed to development environment: https://dashboard.prototypes.kube001.services.stellar-ops.com

[stellar-jenkins]

Preview deployed to development environment: https://dashboard.prototypes.kube001.services.stellar-ops.com

[stellar-jenkins]

Preview deployed to development environment: https://dashboard.prototypes.kube001.services.stellar-ops.com

[stellar-jenkins]

Preview deployed to development environment: https://dashboard.prototypes.kube001.services.stellar-ops.com

[stellar-jenkins]

Preview deployed to development environment: https://dashboard.prototypes.kube001.services.stellar-ops.com

[acharb]

@piyalbasu @quietbits (who I think may have an opinion on this)

I played around with @babel/preset-typescript (which I'm guessing the frontend may use when it adds typescript) to compile the backend using webpack , but it wasn't trivial refactoring webpack to compile the backend too, so I decided to stick with tsc (which seems much easier and we may want to use instead of babel on the frontend anyways). lmk if you have thoughts against this approach

[piyalbasu]

@piyalbasu @quietbits (who I think may have an opinion on this)

I played around with @babel/preset-typescript (which I'm guessing the frontend may use when it adds typescript) to compile the backend using webpack , but it wasn't trivial refactoring webpack to compile the backend too, so I decided to stick with tsc (which seems much easier and we may want to use instead of babel on the frontend anyways). lmk if you have thoughts against this approach

This makes sense. Totally favor a simpler tsc script. Webpack stuff can get pretty hairy pretty fast. We'll prob eliminate Webpack altogether when we refactor the FE anyway

[stellar-jenkins]

Preview deployed to development environment: https://dashboard.prototypes.kube001.services.stellar-ops.com

[stellar-jenkins]

Preview deployed to development environment: https://dashboard.prototypes.kube001.services.stellar-ops.com