The type read-only property of the EncodedAudioChunk interface returns a value indicating whether the audio chunk is a key chunk, which does not relying on other frames for decoding.

A string, one of:

"key"

The data is a key chunk.

"delta"

The data is not a key chunk.

In the following example the type is printed to the console.

const init = {
  type: "key",
  data: audioBuffer,
  timestamp: 23000000,
  duration: 2000000,
};
chunk = EncodedAudioChunk(init);

console.log(chunk.type); //"key"