Make FormattingHost required again

Author: andrewbranch

src/services/formatting/formatting.ts

@@ -3,7 +3,7 @@ namespace ts.formatting {
     export interface FormatContext {
         readonly options: FormatCodeSettings;
         readonly getRules: RulesMap;
-        readonly host?: FormattingHost;
+        readonly host: FormattingHost;
     }
 
     export interface TextRangeWithKind<T extends SyntaxKind = SyntaxKind> extends TextRange {

src/services/utilities.ts

@@ -2085,9 +2085,9 @@ namespace ts {
     /**
      * The default is CRLF.
      */
-    export function getNewLineOrDefaultFromHost(host: FormattingHost | undefined, formatSettings?: FormatCodeSettings) {
+    export function getNewLineOrDefaultFromHost(host: FormattingHost, formatSettings?: FormatCodeSettings) {
         return formatSettings?.newLineCharacter ||
-            host?.getNewLine?.() ||
+            host.getNewLine?.() ||
             carriageReturnLineFeed;
     }