Comparing ReScript's behavior to Prettier's, Prettier is consistent for types and values, but ReScript is not.

My proposal is to standardize on Prettier's behavior, also because it seems to follow user intention better. If the user put the first record field on a separate line, we may assume that they intend to keep the formatting multiline and/or add more fields later.

Prettier

Types

type X = { a: number }; type Y = { a: number }; type Z = { a: number };

reformats to

type X = { a: number }; type Y = { a: number }; type Z = { a: number; };

Values

let x = { a: 2 }; let x = { a: 2, }; let x = { a: 2, };

reformats to

let x = { a: 2 }; let x = { a: 2 }; let x = { a: 2, };

ReScript

Types

type x = {a: int} type y = {a: int } type z = { a: int, }

reformats to

type x = {a: int} type y = {a: int} type z = {a: int} 

Values

let x = {a: 2} let x = {a: 2 } let x = { a: 2 }

reformats to

let x = {a: 2} let x = { a: 2, } let x = { a: 2, }