diff --git a/src/cli-ux/styled/table.ts b/src/cli-ux/styled/table.ts
index 5d173d268..dc4f7f7d6 100644
--- a/src/cli-ux/styled/table.ts
+++ b/src/cli-ux/styled/table.ts
@@ -309,11 +309,11 @@ export namespace table {
     columns: Interfaces.OptionFlag<string | undefined>;
     sort: Interfaces.OptionFlag<string | undefined>;
     filter: Interfaces.OptionFlag<string | undefined>;
-    csv: Interfaces.Flag<boolean>;
+    csv: Interfaces.BooleanFlag<boolean>;
     output: Interfaces.OptionFlag<string | undefined>;
-    extended: Interfaces.Flag<boolean>;
-    'no-truncate': Interfaces.Flag<boolean>;
-    'no-header': Interfaces.Flag<boolean>;
+    extended: Interfaces.BooleanFlag<boolean>;
+    'no-truncate': Interfaces.BooleanFlag<boolean>;
+    'no-header': Interfaces.BooleanFlag<boolean>;
   } = {
     columns: F.string({exclusive: ['extended'], description: 'only show provided columns (comma-separated)'}),
     sort: F.string({description: 'property to sort by (prepend \'-\' for descending)'}),
diff --git a/src/interfaces/parser.ts b/src/interfaces/parser.ts
index 7fc4ded0f..c95bfec7a 100644
--- a/src/interfaces/parser.ts
+++ b/src/interfaces/parser.ts
@@ -215,7 +215,7 @@ export type OptionFlagProps = FlagProps & {
 export type FlagParserContext = Command & {token: FlagToken}
 
 export type FlagParser<T, I extends string | boolean, P = CustomOptions> = (input: I, context: FlagParserContext, opts: P & OptionFlag<T, P>) =>
-  T extends Array<infer U> ? Promise<U> : Promise<T>
+  T extends Array<infer U> ? Promise<U | undefined> : Promise<T | undefined>
 
 export type ArgParserContext = Command & {token: ArgToken}