fix: change imports to type imports for better type checking

Author: manu4543

src/index.ts

@@ -1,4 +1,4 @@
-import { SrcOptions, Transformation, UploadOptions, UploadResponse } from "./interfaces";
+import type { SrcOptions, Transformation, UploadOptions, UploadResponse } from "./interfaces";
 import { ImageKitAbortError, ImageKitInvalidRequestError, ImageKitServerError, ImageKitUploadNetworkError, upload } from "./upload";
 import { buildSrc, buildTransformationString } from "./url";
 

src/upload.ts

@@ -1,5 +1,5 @@
 import errorMessages from "./constants/errorMessages";
-import { ResponseMetadata, UploadOptions, UploadResponse } from "./interfaces";
+import type { ResponseMetadata, UploadOptions, UploadResponse } from "./interfaces";
 
 /**
  * Represents an error when a request to ImageKit is invalid.

src/url.ts

@@ -1,5 +1,5 @@
-import { SrcOptions } from "./interfaces";
-import { ImageOverlay, SolidColorOverlay, SubtitleOverlay, TextOverlay, Transformation, VideoOverlay } from "./interfaces/Transformation";
+import type { SrcOptions } from "./interfaces";
+import type { ImageOverlay, SolidColorOverlay, SubtitleOverlay, TextOverlay, Transformation, VideoOverlay } from "./interfaces/Transformation";
 import transformationUtils, { safeBtoa } from "./utils/transformation";
 const TRANSFORMATION_PARAMETER = "tr";
 const SIMPLE_OVERLAY_PATH_REGEX = new RegExp('^[a-zA-Z0-9-._/ ]*$')

src/utils/transformation.ts

@@ -3,8 +3,6 @@ import { TransformationPosition, SrcOptions } from "../interfaces";
 
 const QUERY_TRANSFORMATION_POSITION: TransformationPosition = "query";
 const PATH_TRANSFORMATION_POSITION: TransformationPosition = "path";
-const DEFAULT_TRANSFORMATION_POSITION: TransformationPosition = QUERY_TRANSFORMATION_POSITION;
-const VALID_TRANSFORMATION_POSITIONS = [PATH_TRANSFORMATION_POSITION, QUERY_TRANSFORMATION_POSITION];
 const CHAIN_TRANSFORM_DELIMITER: string = ":";
 const TRANSFORM_DELIMITER: string = ",";
 const TRANSFORM_KEY_VALUE_DELIMITER: string = "-";