encodeBase64

function encodeBase64(data): string

// Encoding binary data as a hexstring
encodeBase64('0x1234');

// Encoding binary data as a Uint8Array
encodeBase64(new Uint8Array([0x12, 0x34]));

// The input MUST be data...
encodeBase64('Hello World!!');

// ...use toUtf8Bytes for this.
encodeBase64(toUtf8Bytes('Hello World!!'));