function buildMap(
    upperStart: number,
    lowerStart: number,
    digitStart?: number
): Record<string, string> {
    const map: Record<string, string> = {};
    for (let i = 0; i < 26; i++) {
        map[String.fromCharCode(65 + i)] = String.fromCodePoint(upperStart + i);
        map[String.fromCharCode(97 + i)] = String.fromCodePoint(lowerStart + i);
    }
    if (digitStart !== undefined) {
        for (let i = 0; i < 10; i++) {
            map[String.fromCharCode(48 + i)] = String.fromCodePoint(digitStart + i);
        }
    }
    return map;
}

// Sans-Serif Bold: U+1D5D4–U+1D5ED (upper), U+1D5EE–U+1D607 (lower), U+1D7EC–U+1D7F5 (digits)
export const BOLD_MAP: Record<string, string> = buildMap(0x1D5D4, 0x1D5EE, 0x1D7EC);

// Sans-Serif Italic: U+1D608–U+1D621 (upper), U+1D622–U+1D63B (lower)
export const ITALIC_MAP: Record<string, string> = buildMap(0x1D608, 0x1D622);

// Sans-Serif Bold-Italic: U+1D63C–U+1D655 (upper), U+1D656–U+1D66F (lower)
export const BOLD_ITALIC_MAP: Record<string, string> = buildMap(0x1D63C, 0x1D656);