Fix rendering of optional methods

Resolves #2995

Author: Gerrit0

CHANGELOG.md

@@ -7,6 +7,7 @@ title: Changelog
 ### Bug Fixes
 
 - Fixed link resolution not working correctly in first comment on the file in some cases, #2994.
+- Optional methods are now rendered with a trailing `?` in the reflection preview and signature, #2995.
 - The `compilerOptions` option now functions properly with non-boolean options, #3000.
 - Configuration errors within the `compilerOptions` option are now handled gracefully, #3000.
 

src/lib/output/formatter.tsx

@@ -961,6 +961,7 @@ export class FormattedCodeBuilder {
         const id = this.newId();
         return group(id, [
             name,
+            sig.parent.flags.isOptional ? simpleElement(<span class="tsd-signature-symbol">?</span>) : emptyNode,
             this.typeParameters(sig),
             ...this.parameters(sig, id),
             nodes(

src/test/converter2/renderer/gh2995.ts

@@ -0,0 +1,3 @@
+export interface gh2995 {
+    optionalMethod?(filter: string, args: string[]): any;
+}

src/test/converter2/renderer/index.ts

@@ -136,4 +136,5 @@ export interface DisabledGroups {
 
 export * as ExpandType from "./expandType";
 export * as GH2982 from "./gh2982";
+export { gh2995 } from "./gh2995";
 export { box as boxAlias };