js-tts-wrapper/esm/utils/base64-utils.js

A JavaScript/TypeScript library that provides a unified API for working with multiple cloud-based Text-to-Speech (TTS) services

export function base64ToUint8Array(b64) {
    const binaryStr = atob(b64);
    const bytes = new Uint8Array(binaryStr.length);
    for (let i = 0; i < binaryStr.length; i++) {
        bytes[i] = binaryStr.charCodeAt(i);
    }
    return bytes;
}