ladybird/Libraries/LibWeb/Encoding/TextEncoder.idl

// https://encoding.spec.whatwg.org/#textencodercommon
interface mixin TextEncoderCommon {
    readonly attribute DOMString encoding;
};

// https://encoding.spec.whatwg.org/#dictdef-textencoderencodeintoresult
dictionary TextEncoderEncodeIntoResult {
    unsigned long long read;
    unsigned long long written;
};

// https://encoding.spec.whatwg.org/#textencoder
[Exposed=*]
interface TextEncoder {
    constructor();

    [NewObject] Uint8Array encode(optional USVString input = "");
    TextEncoderEncodeIntoResult encodeInto(USVString source, [AllowShared] Uint8Array destination);
};
TextEncoder includes TextEncoderCommon;