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frontend/scripts/prepare-font.mjs

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+import { execFileSync } from "node:child_process";
+import { existsSync, mkdirSync, readFileSync, statSync, unlinkSync } from "node:fs";
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const fontsDir = join(__dirname, "..", "public", "fonts");
+const outputWoff2 = join(fontsDir, "lxgwwenkaimono-medium.woff2");
+
+const sourceCandidates = [
+	join(fontsDir, "LXGWWenKaiMono-Medium.ttf"),
+	join(__dirname, "..", "assets", "fonts", "LXGWWenKaiMono-Medium.ttf"),
+];
+
+const sourceTtf = sourceCandidates.find((path) => existsSync(path));
+const MIN_WOFF2_BYTES = 5_000_000;
+
+if (!sourceTtf) {
+	console.warn("[prepare-font] LXGWWenKaiMono-Medium.ttf not found, skipping");
+	process.exit(0);
+}
+
+mkdirSync(fontsDir, { recursive: true });
+
+function woff2LooksValid() {
+	if (!existsSync(outputWoff2)) return false;
+	return readFileSync(outputWoff2).length >= MIN_WOFF2_BYTES;
+}
+
+if (woff2LooksValid()) {
+	const sourceMtime = statSync(sourceTtf).mtimeMs;
+	const outputMtime = statSync(outputWoff2).mtimeMs;
+	if (outputMtime >= sourceMtime) {
+		const sizeMb = (readFileSync(outputWoff2).length / (1024 * 1024)).toFixed(2);
+		console.log(`[prepare-font] up to date ${outputWoff2} (${sizeMb} MB)`);
+		process.exit(0);
+	}
+}
+
+if (existsSync(outputWoff2) && !woff2LooksValid()) {
+	console.warn("[prepare-font] removing invalid woff2 (< 5 MB, likely subset or corrupt)");
+	unlinkSync(outputWoff2);
+}
+
+console.log("[prepare-font] converting full font to woff2 (no glyph subsetting, may take a few minutes)...");
+
+const py = [
+	"from fontTools.ttLib.woff2 import compress",
+	"import sys",
+	"compress(sys.argv[1], sys.argv[2])",
+].join("\n");
+
+execFileSync("python", ["-c", py, sourceTtf, outputWoff2], { stdio: "inherit" });
+
+const sizeBytes = readFileSync(outputWoff2).length;
+if (sizeBytes < MIN_WOFF2_BYTES) {
+	throw new Error(
+		`[prepare-font] woff2 output too small (${sizeBytes} bytes); conversion likely failed`,
+	);
+}
+
+const sizeMb = (sizeBytes / (1024 * 1024)).toFixed(2);
+console.log(`[prepare-font] wrote ${outputWoff2} (${sizeMb} MB, full glyph set)`);