Initial commit

frontend/src/constants/preview.ts

@@ -0,0 +1,32 @@
+export const RERENDER_DELTA = 48;
+export const MAX_PIXEL_RATIO = 2;
+export const FAST_SCROLL_VELOCITY_THRESHOLD = 0.8;
+export const FAST_SCROLL_DWELL_THRESHOLD_MS = 120;
+export const SCROLL_VELOCITY_MIN_DELTA = 0.05;
+
+export const AUDIO_EXTENSIONS = new Set([
+  'aac',
+  'aiff',
+  'flac',
+  'm4a',
+  'mp3',
+  'ogg',
+  'oga',
+  'opus',
+  'wav',
+  'weba',
+]);
+
+export const VIDEO_EXTENSIONS = new Set([
+  'avi',
+  'mkv',
+  'mov',
+  'mp4',
+  'm4v',
+  'webm',
+  'wmv',
+]);
+
+export const DOCUMENT_VIEWER_PORTRAIT_HEIGHT_RATIO = 0.4;
+export const PORTRAIT_RATIO_STYLE_ID = 'document-viewer-portrait-ratio-style';
+export const MIN_STACKED_BREAKPOINT = 480;