Option for functional programming style type declarations

[scarf005]

I'm aware this might be a niche style, so it's perfectly okay if this suggestion is declined. However, I'm interested in how I could implement type declarations in the style of Haskell or other functional programming languages with dprint. Here's what I had in mind:

1. NewLineAfterTypeInFunctionDeclaration

const add
    : (a: number) => (b: number) => number = (a) => (b) => a + b

2. NewLineBeforeInitializerInVariableDeclaration

const add : (a: number) => (b: number) => number
    = (a) => (b) => a + b

3. Using both

const add
    : (a: number) => (b: number) => number
    = (a) => (b) => a + b

Any pointers on where to start or which parts of the codebase I should look into would be greatly appreciated. Thanks!

[adrian-gierakowski]

Have a look at https://github.com/dprint/dprint-plugin-typescript/pull/396