Refactor Typescript generation to not use Namespaces

[wgottschalk]

Babel 7 parses typescript and can confirm that they refuse to implement namespaces due to the fact that they are legacy. babel/babel#8244

When parsing from JSON schema to typescript the Convert function is wrapped in a namespace.

Solution:

Refactor the Convert function to be a const instead of a namespace. Do not export any of the helpers still.

before:

export namespace Convert {
  export function toThing(data: string): Thing {...}
  export function thingToJSON(data: Thing): string {...}
}

after:

export const Convert = {
  toThing() {...}
  thingToJSON() {...}
}

// rest of the helpers go here and are not exported

[schani]

Would you consider contributing a PR that does this? We'd love to help you along. The code that emits TypeScript is here and here.

[wgottschalk]

Sounds good to me. I'll talk a look at this