Refactor codegen.ts

[erictuvesson]

Splitting out the not exported code from codegen.ts to make it easier to read.

There are a few exported methods in CodeGen that I don't really see a good use, I didn't want to remove anything for compatibility.

Microsoft Reviewers: Open in CodeFlow

[mtennoe]

This is great, thanks for contributing!
I left a few minor comments, should be very quick to address :)

[mtennoe]

function [](start = 15, length = 8)

Personal preference: Should we convert these to arrow functions instead? that would look slightly cleaner to me here, and we could remove some redudnant typing. I.e.

export const Swagger2Gen: CodeGenerator = {
  getViewData: opts => {
    verifyThatWeAreGeneratingForSwagger2(opts);

    return getViewForSwagger2(opts);
  },
  getCode: opts => {
    const data = this.getViewData(opts);
    return transformToCodeWithMustache(data, opts.template, opts.mustache);
  }
};

[erictuvesson]

Agree, that makes it cleaner and the scope easier to follow.

[erictuvesson]

@mtennoe I have updated it now.

[mtennoe]

@erictuvesson - Great!
There seems to be some minor build issues though that needs to be addressed

[mtennoe]

@erictuvesson Merged and published as 3.0.5, thanks!