feat: add ROTATION_DEGREES constant for valid PDF page rotations

Author: pasyukevich

src/constants.ts

@@ -33,4 +33,9 @@ const PDF_PASSWORD_FORM_RESPONSES = {
     INCORRECT_PASSWORD: 2,
 };
 
-export {PAGE_BORDER, LARGE_SCREEN_SIDE_SPACING, DEFAULT_DOCUMENT_OPTIONS, DEFAULT_EXTERNAL_LINK_TARGET, PDF_PASSWORD_FORM_RESPONSES};
+/**
+ * Valid rotation angles for PDF pages, in degrees clockwise.
+ */
+const ROTATION_DEGREES = [0, 90, 180, 270] as const;
+
+export {PAGE_BORDER, LARGE_SCREEN_SIDE_SPACING, DEFAULT_DOCUMENT_OPTIONS, DEFAULT_EXTERNAL_LINK_TARGET, PDF_PASSWORD_FORM_RESPONSES, ROTATION_DEGREES};

src/index.ts

@@ -1,9 +1,10 @@
 import PDFPreviewer from './PDFPreviewer.js';
+import {ROTATION_DEGREES} from './constants.js';
 import type {RotationDegrees} from './types.js';
 
 const PACKAGE_NAME = 'react-fast-pdf';
 
-export {PDFPreviewer};
+export {PDFPreviewer, ROTATION_DEGREES};
 export type {RotationDegrees};
 
 export default {