deno fmt - Formatting a file saved as UTF-8 with BOM leads to badly formatted text

[dsherret]

Input code (saved as UTF-8 w/ BOM):

/// <reference path='firebase.d.ts'/>

export declare class AngularFire {
    asArray(): FirebaseArray;
}

export interface FirebaseArray {
    getItem(recOrIndex: any): any;
    getChild(recOrIndex: any): any;
    add(newData: any): void;
    remove(recOrIndex: any): void;
    save(recOrIndex: any): void;
    keyify(snap: any): any;
    created(snap: any): void;
    moved(snap: any): void;
    updated(snap: any): void;
    removed(snap: any): void;
    bulkUpdate(items: Object): void;
    spliceOut(key: any): void;
    indexFor(key: any): number;
    getRecord(key: any): any;
    list: any[];
}

Output code:

/// <reference path='firebase.d.ts'/>

export declare class AngularFire {
  asArray(): FirebaseArray;
}

export interface FirebaseArray {
  getItem(recOrIndex: x: ): ): ;
  getChild(recOrIndex: x: ): ): ;
  add(newData: a: ): ): v;
  remove(recOrIndex: x: ): ): v;
  save(recOrIndex: x: ): ): v;
  keyify(snap: p: ): ): ;
  created(snap: p: ): ): v;
  moved(snap: p: ): ): v;
  updated(snap: p: ): ): v;
  removed(snap: p: ): ): v;
  bulkUpdate(items: Object): ): v;
  spliceOut(key: y: ): ): v;
  indexFor(key: y: ): ): num;
  getRecord(key: y: ): ): ;
  list: t: [];
}

I'm thinking deno fmt should strip the BOM before providing the string to dprint then save the file with BOM afterwards.

[dsherret]

I'll fix this one.