Source

import fs from "node:fs";
import { defineConfig, type Plugin } from "vite";
import react from "@vitejs/plugin-react";

// pdf.js fetches these at run time: WebAssembly decoders for JBIG2 and JPEG 2000 scans and ICC
// colors, and the character maps many CJK and some Latin fonts need. UTF-8 and UTF-32 maps are
// left out: PDFs almost never use them, and they would add half a megabyte to every deploy.
const PDFJS = "node_modules/pdfjs-dist";
const WASM = ["jbig2.wasm", "openjpeg.wasm", "qcms_bg.wasm"];
function pdfjsAssets(): Plugin {
  return {
    name: "pdfjs-assets",
    generateBundle() {
      for (const f of WASM) this.emitFile({ type: "asset", fileName: `pdfjs/${f}`, source: fs.readFileSync(`${PDFJS}/wasm/${f}`) });
      for (const f of fs.readdirSync(`${PDFJS}/cmaps`)) {
        if (f.endsWith(".bcmap") && !/UTF(8|32)/.test(f)) this.emitFile({ type: "asset", fileName: `pdfjs/cmaps/${f}`, source: fs.readFileSync(`${PDFJS}/cmaps/${f}`) });
      }
    },
  };
}

export default defineConfig({
  plugins: [react(), pdfjsAssets()],
  build: {
    target: "es2020",
    chunkSizeWarningLimit: 1500,
    // The pdf.js worker ships as .mjs; serve it as .js so every host sends a JavaScript content type.
    rollupOptions: { output: { assetFileNames: (a) => (a.name?.endsWith(".mjs") ? "assets/[name]-[hash].js" : "assets/[name]-[hash][extname]") } },
  },
});