mail-mime-builder/dist/esm/base64.js

RFC-2822, RFC-2045 and RFC-2049 compliant zero dependency raw email message generator.

const encoder = new TextEncoder();
export function toBase64(text) {
    const bytes = encoder.encode(text);
    const binString = String.fromCodePoint(...bytes);
    return btoa(binString);
}
export function toBase64EncodeURI(text) {
    return encodeURIComponent(toBase64(text));
}