import lazily

src/data/image.ts

@@ -1,10 +1,12 @@
-import decodePng from "png-chunks-extract";
+import extractPngChunks from "png-chunks-extract";
 import tEXt from "png-chunk-text";
 import encodePng from "png-chunks-encode";
 import { stringToBase64, encode, decode, base64ToString } from "./encode";
 import { EXPORT_DATA_TYPES, MIME_TYPES } from "../constants";
 import { PngChunk } from "../types";
 
+export { extractPngChunks };
+
 // -----------------------------------------------------------------------------
 // PNG
 // -----------------------------------------------------------------------------
@@ -29,7 +31,9 @@ const blobToArrayBuffer = (blob: Blob): Promise<ArrayBuffer> => {
 export const getTEXtChunk = async (
   blob: Blob,
 ): Promise<{ keyword: string; text: string } | null> => {
-  const chunks = decodePng(new Uint8Array(await blobToArrayBuffer(blob)));
+  const chunks = extractPngChunks(
+    new Uint8Array(await blobToArrayBuffer(blob)),
+  );
   const metadataChunk = chunks.find((chunk) => chunk.name === "tEXt");
   if (metadataChunk) {
     return tEXt.decode(metadataChunk.data);
@@ -66,7 +70,9 @@ export const encodePngMetadata = async ({
   blob: Blob;
   metadata: string;
 }) => {
-  const chunks = decodePng(new Uint8Array(await blobToArrayBuffer(blob)));
+  const chunks = extractPngChunks(
+    new Uint8Array(await blobToArrayBuffer(blob)),
+  );
 
   const metadataChunk = tEXt.encode(
     MIME_TYPES.excalidraw,

src/element/image.ts

@@ -12,8 +12,6 @@ import {
   FileId,
   InitializedExcalidrawImageElement,
 } from "./types";
-import decodePng from "png-chunks-extract";
-import { findPngChunk } from "../data/image";
 
 export const loadHTMLImageElement = (dataURL: DataURL) => {
   return new Promise<HTMLImageElement>((resolve, reject) => {
@@ -154,8 +152,10 @@ export const hasTransparentPixels = async (imageFile: Blob | File) => {
     return false;
   }
 
+  const { findPngChunk, extractPngChunks } = await import("../data/image");
+
   const buffer = await imageFile.arrayBuffer();
-  const chunks = decodePng(new Uint8Array(buffer));
+  const chunks = extractPngChunks(new Uint8Array(buffer));
 
   // early exit if tRNS not found and IHDR states no support for alpha
   // -----------------------------------------------------------------------