feat: subset font glyphs for SVG export (#8384)

Co-authored-by: dwelle <5153846+dwelle@users.noreply.github.com>

scripts/buildWasm.js

@@ -0,0 +1,75 @@
+/**
+ * This script is used to convert the wasm modules into js modules, with the binary converted into base64 encoded strings.
+ */
+const fs = require("fs");
+const path = require("path");
+
+const wasmModules = [
+  {
+    pkg: `../node_modules/fonteditor-core`,
+    src: `./wasm/woff2.wasm`,
+    dest: `../packages/excalidraw/fonts/wasm/woff2.wasm.ts`,
+  },
+  {
+    pkg: `../node_modules/harfbuzzjs`,
+    src: `./wasm/hb-subset.wasm`,
+    dest: `../packages/excalidraw/fonts/wasm/hb-subset.wasm.ts`,
+  },
+];
+
+for (const { pkg, src, dest } of wasmModules) {
+  const packagePath = path.resolve(__dirname, pkg, "package.json");
+  const licensePath = path.resolve(__dirname, pkg, "LICENSE");
+  const sourcePath = path.resolve(__dirname, src);
+  const destPath = path.resolve(__dirname, dest);
+
+  const {
+    name,
+    version,
+    author,
+    license,
+    authors,
+    licenses,
+  } = require(packagePath);
+
+  const licenseContent = fs.readFileSync(licensePath, "utf-8") || "";
+  const base64 = fs.readFileSync(sourcePath, "base64");
+  const content = `// GENERATED CODE -- DO NOT EDIT!
+/* eslint-disable prettier/prettier */
+// @ts-nocheck
+
+/**
+* The following wasm module is generated with \`scripts/buildWasm.js\` and encoded as base64.
+*
+* The source of this content is taken from the package "${name}", which contains the following metadata:
+* 
+* @author ${author || JSON.stringify(authors)} 
+* @license ${license || JSON.stringify(licenses)}
+* @version ${version}
+
+${licenseContent}
+*/
+
+// faster atob alternative - https://github.com/evanw/esbuild/issues/1534#issuecomment-902738399
+const __toBinary = /* @__PURE__ */ (() => {
+  const table = new Uint8Array(128);
+  for (let i = 0; i < 64; i++)
+    {table[i < 26 ? i + 65 : i < 52 ? i + 71 : i < 62 ? i - 4 : i * 4 - 205] = i;}
+  return (base64) => {
+    const n = base64.length; const bytes = new Uint8Array((n - (base64[n - 1] == "=") - (base64[n - 2] == "=")) * 3 / 4 | 0);
+    for (let i2 = 0, j = 0; i2 < n; ) {
+      const c0 = table[base64.charCodeAt(i2++)]; const c1 = table[base64.charCodeAt(i2++)];
+      const c2 = table[base64.charCodeAt(i2++)]; const c3 = table[base64.charCodeAt(i2++)];
+      bytes[j++] = c0 << 2 | c1 >> 4;
+      bytes[j++] = c1 << 4 | c2 >> 2;
+      bytes[j++] = c2 << 6 | c3;
+    }
+    return bytes;
+  };
+})();
+
+export default __toBinary(\`${base64}\`);
+`;
+
+  fs.writeFileSync(destPath, content);
+}