From d381d090e3d11f9cd6b991d98f32c2d33cae15c8 Mon Sep 17 00:00:00 2001
From: Johann Schopplich <mail@johannschopplich.com>
Date: Sat, 12 Aug 2023 19:42:15 +0200
Subject: [PATCH] perf: use modern pdfjs bundle

---
 src/image.ts      |  4 ++--
 src/index.node.ts |  6 +++---
 src/index.web.ts  |  6 +++---
 src/utils.ts      | 29 +++++++----------------------
 4 files changed, 15 insertions(+), 30 deletions(-)

diff --git a/src/image.ts b/src/image.ts
index 184de96..6601c6a 100644
--- a/src/image.ts
+++ b/src/image.ts
@@ -1,4 +1,4 @@
-import { getDocumentProxy, getResolvedPDFJSInstance } from './utils'
+import { getDocumentProxy, getResolvedPDFJS } from './utils'
 
 export async function getImagesFromPage(
   data: ArrayBuffer,
@@ -7,7 +7,7 @@ export async function getImagesFromPage(
   const pdf = await getDocumentProxy(data)
   const page = await pdf.getPage(pageNumber)
   const operatorList = await page.getOperatorList()
-  const { OPS } = getResolvedPDFJSInstance()
+  const { OPS } = getResolvedPDFJS()
 
   const images: ArrayBuffer[] = []
   for (const op of operatorList.fnArray) {
diff --git a/src/index.node.ts b/src/index.node.ts
index e2386f4..5a847cf 100644
--- a/src/index.node.ts
+++ b/src/index.node.ts
@@ -1,13 +1,13 @@
 import { decodePDFText as _decodePDFText } from './text'
 import { getImagesFromPage as _getImagesFromPage } from './image'
-import { resolvePDFJSNodeImports } from './utils'
+import { resolvePDFJSImports } from './utils'
 
 export const decodePDFText: typeof _decodePDFText = async (...args) => {
-  await resolvePDFJSNodeImports()
+  await resolvePDFJSImports()
   return await _decodePDFText(...args)
 }
 
 export const getImagesFromPage: typeof _getImagesFromPage = async (...args) => {
-  await resolvePDFJSNodeImports()
+  await resolvePDFJSImports()
   return await _getImagesFromPage(...args)
 }
diff --git a/src/index.web.ts b/src/index.web.ts
index 6b3a337..5a847cf 100644
--- a/src/index.web.ts
+++ b/src/index.web.ts
@@ -1,13 +1,13 @@
 import { decodePDFText as _decodePDFText } from './text'
 import { getImagesFromPage as _getImagesFromPage } from './image'
-import { resolvePDFJSWebImports } from './utils'
+import { resolvePDFJSImports } from './utils'
 
 export const decodePDFText: typeof _decodePDFText = async (...args) => {
-  await resolvePDFJSWebImports()
+  await resolvePDFJSImports()
   return await _decodePDFText(...args)
 }
 
 export const getImagesFromPage: typeof _getImagesFromPage = async (...args) => {
-  await resolvePDFJSWebImports()
+  await resolvePDFJSImports()
   return await _getImagesFromPage(...args)
 }
diff --git a/src/utils.ts b/src/utils.ts
index 2784020..9bf2747 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,9 +1,9 @@
 import type * as PDFJS from 'pdfjs-dist'
 
-let instance: typeof PDFJS | undefined
+let resolvedModule: typeof PDFJS | undefined
 
 export async function getDocumentProxy(data: ArrayBuffer) {
-  const { getDocument } = getResolvedPDFJSInstance()
+  const { getDocument } = getResolvedPDFJS()
   const pdf = await getDocument({
     data,
     useWorkerFetch: false,
@@ -14,32 +14,17 @@ export async function getDocumentProxy(data: ArrayBuffer) {
   return pdf
 }
 
-export function getResolvedPDFJSInstance() {
-  return instance!
+export function getResolvedPDFJS() {
+  return resolvedModule!
 }
 
-export async function resolvePDFJSWebImports() {
-  if (instance)
+export async function resolvePDFJSImports() {
+  if (resolvedModule)
     return
 
   try {
     const { default: mod } = await import('pdfjs-dist')
-    instance = mod
-  }
-  catch (error) {
-    throw new Error(
-      'PDF.js is not available. Please add the package as a dependency.',
-    )
-  }
-}
-
-export async function resolvePDFJSNodeImports() {
-  if (instance)
-    return
-
-  try {
-    const { default: mod } = await import('pdfjs-dist/legacy/build/pdf')
-    instance = mod
+    resolvedModule = mod
   }
   catch (error) {
     throw new Error(