Interface ParseOptions

custom decoders keyed by (lowercased) Content-Transfer-Encoding

Use these to handle an encoding the defaults don't, or to override one. A Decoder turns the CRLF-split lines of a part into its decoded bytes; the parser strips the CRLFs when splitting, so a passthrough decoder re-emits them between lines:

const crlf = new Uint8Array([13, 10]);
const decoderOverrides = new Map([
  ["binary", async function* (lines) {
    let first = true;
    for await (const line of lines) {
      if (!first) yield crlf;
      first = false;
      yield line;
    }
  }],
]);
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