fix: additional commas in TsTypeLiteral

[henryqdineen]

This is very pretty similar to #868 but with TsTypeLiteral. We were working on a codemod that involves adding to a type and it was resulting in syntactically incorrect code like this (notice the ;,):

type FooProps = {
  bar: string;,
  children?: React.ReactNode
}

We were able to patch-package but I figured I would make an upstream fix. Thank you!

[eventualbuddha]

Thanks! It'd be very useful to have a test that fails before the changes you've made. Mind doing that?

[henryqdineen]

Thanks! I just pushed a commit to add a test following a similar pattern as #1157

Against master the test fails with this error:

  1) TypeScript
       TypeLiteral: unwanted comma:

      AssertionError [ERR_ASSERTION]: Expected values to be strictly equal:
+ actual - expected

+ 'type A = {\n  x: boolean;,\n  y: number;\n}'
- 'type A = {\n  x: boolean;\n  y: number;\n}'
                            ^
      + expected - actual

       type A = {
      -  x: boolean;,
      +  x: boolean;
         y: number;
       }

[eventualbuddha]

Thanks! Will merge and do a release soon.

[eventualbuddha]

Released in v0.21.2.