fix: Add Support for Proper Image Size Constraints

Author: sfreeman422

api-report/genai-node.api.md

@@ -1496,6 +1496,8 @@ export interface GeneratedVideo {
     video?: Video;
 }
 
+export type ImageSizeConfig = '512' | '1K' | '2K' | '4K';
+
 // @public
 export interface GenerateImagesConfig {
     abortSignal?: AbortSignal;
@@ -1504,7 +1506,7 @@ export interface GenerateImagesConfig {
     enhancePrompt?: boolean;
     guidanceScale?: number;
     httpOptions?: HttpOptions;
-    imageSize?: string;
+    imageSize?: ImageSizeConfig;
     includeRaiReason?: boolean;
     includeSafetyAttributes?: boolean;
     labels?: Record<string, string>;
@@ -2005,7 +2007,7 @@ export { Image_2 as Image }
 export interface ImageConfig {
     aspectRatio?: string;
     imageOutputOptions?: ImageConfigImageOutputOptions;
-    imageSize?: string;
+    imageSize?: ImageSizeConfig;
     outputCompressionQuality?: number;
     outputMimeType?: string;
     personGeneration?: string;

api-report/genai-web.api.md

@@ -1504,7 +1504,7 @@ export interface GenerateImagesConfig {
     enhancePrompt?: boolean;
     guidanceScale?: number;
     httpOptions?: HttpOptions;
-    imageSize?: string;
+    imageSize?: ImageSizeConfig;
     includeRaiReason?: boolean;
     includeSafetyAttributes?: boolean;
     labels?: Record<string, string>;
@@ -2005,7 +2005,7 @@ export { Image_2 as Image }
 export interface ImageConfig {
     aspectRatio?: string;
     imageOutputOptions?: ImageConfigImageOutputOptions;
-    imageSize?: string;
+    imageSize?: ImageSizeConfig;
     outputCompressionQuality?: number;
     outputMimeType?: string;
     personGeneration?: string;

api-report/genai.api.md

@@ -1504,7 +1504,7 @@ export interface GenerateImagesConfig {
     enhancePrompt?: boolean;
     guidanceScale?: number;
     httpOptions?: HttpOptions;
-    imageSize?: string;
+    imageSize?: ImageSizeConfig;
     includeRaiReason?: boolean;
     includeSafetyAttributes?: boolean;
     labels?: Record<string, string>;
@@ -2005,7 +2005,7 @@ export { Image_2 as Image }
 export interface ImageConfig {
     aspectRatio?: string;
     imageOutputOptions?: ImageConfigImageOutputOptions;
-    imageSize?: string;
+    imageSize?: ImageSizeConfig;
     outputCompressionQuality?: number;
     outputMimeType?: string;
     personGeneration?: string;

src/types.ts

@@ -2345,6 +2345,8 @@ export declare interface ImageConfigImageOutputOptions {
   mimeType?: string;
 }
 
+export declare type ImageSizeConfig = '512' | '1K' | '2K' | '4K';
+
 /** The image generation configuration to be used in GenerateContentConfig. */
 export declare interface ImageConfig {
   /** Aspect ratio of the generated images. Supported values are
@@ -2353,7 +2355,7 @@ export declare interface ImageConfig {
   /** Optional. Specifies the size of generated images. Supported
       values are `1K`, `2K`, `4K`. If not specified, the model will use default
       value `1K`. */
-  imageSize?: string;
+  imageSize?: ImageSizeConfig;
   /** Controls the generation of people. Supported values are:
       ALLOW_ALL, ALLOW_ADULT, ALLOW_NONE. */
   personGeneration?: string;
@@ -3484,7 +3486,7 @@ export declare interface GenerateImagesConfig {
   labels?: Record<string, string>;
   /** The size of the largest dimension of the generated image.
       Supported sizes are 1K and 2K (not supported for Imagen 3 models). */
-  imageSize?: string;
+  imageSize?: ImageSizeConfig;
   /** Whether to use the prompt rewriting logic. */
   enhancePrompt?: boolean;
 }