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font-src/support/font-io/font-io.mjs

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+import fs from "fs";
+
+import { FontIo, Ot } from "ot-builder";
+
+export async function readTTF(input) {
+	const buf = await fs.promises.readFile(input);
+	const sfnt = FontIo.readSfntOtf(buf);
+	const font = FontIo.readFont(sfnt, Ot.ListGlyphStoreFactory);
+	return font;
+}
+
+export async function saveTTF(output, font) {
+	const sfnt = FontIo.writeFont(font, {
+		glyphStore: { statOs2XAvgCharWidth: false },
+		generateDummyDigitalSignature: true
+	});
+	const buf = FontIo.writeSfntOtf(sfnt);
+	await fs.promises.writeFile(output, buf);
+}