release = function () {
      /**
       * Releases resources acquired by WebAssembly module.
       */

      releaseWasm(handleWasm);
      porcupineModule._free(pcmWasmPointer);
    }
Creates an instance of wake word engine (Porcupine). Can be called only after '.isLoaded()' returns true.
@param {Array} Array of keyword models. A keyword model is the signature for a given phrase to be detected.
Each keyword model should be stored as 'UInt8Array'.
@param {Float32Array} Detection sensitivities for each keywords model. A higher sensitivity reduces miss rate
at the cost of potentially higher false alarm rate. Sensitivity should be a floating-point number within
[0, 1].
@returns An instance of the engine.