Ugly TS output for type alias of a function type with generics

[kpdonn]

Prettier 1.11.1
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--parser typescript

Input:

type FuncType<T1 extends string, T2 extends number, T3 extends number> = (
  <T4 extends string>(arg: T4) => Output<T1, T2, T3, T4>
);

Output:

type FuncType<T1 extends string, T2 extends number, T3 extends number> = <
  T4 extends string
>(
  arg: T4
) => Output<T1, T2, T3, T4>;

Expected behavior:
Similar to input format where there is a line break added after the =.