Add typed JSON output to theme preview - #8645

@@ -35,6 +35,7 @@ declare abstract class BaseCommand extends Command {
         argv: string[];
     }>;
     protected environmentsFilename(): string | undefined;
+    protected validateNonTTYFlags(flags: FlagOutput): void;
     protected failMissingNonTTYFlags(flags: FlagOutput, requiredFlags: string[]): void;
     private failMissingNonTTYFlagRequirements;
     private applicableNonTTYFlagRequirements;

@@ -11,5 +11,12 @@ export declare abstract class ThemeManager {
     findOrCreate(name?: string, role?: Role): Promise<Theme>;
     fetch(name?: string, role?: Role): Promise<Theme | undefined>;
     generateThemeName(context: string): string;
-    create(themeRole?: Role, themeName?: string): Promise<Theme>;
+    create(themeRole?: Role, themeName?: string): Promise<{
+        createdAtRuntime: boolean;
+        id: number;
+        name: string;
+        processing: boolean;
+        role: string;
+        src?: string;
+    }>;
 }
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