JXA script to record audio and store it into an wav file.

record.sh

# Expects two arguments: full path to .wav file to export to & duration (seconds) to record.
osascript -l "JavaScript" -e 'function run(argv) { ObjC.import("objc"); ObjC.import("AVFoundation"); const outputURL = $.NSURL.alloc.initFileURLWithPath(argv[0]); const settings = $.NSMutableDictionary.alloc.init; settings.setValueForKey($.kAudioFormatAppleIMA4, $.AVFormatIDKey); settings.setValueForKey(16000, $.AVSampleRateKey); settings.setValueForKey(1, $.AVNumberOfChannelsKey); settings.setValueForKey($.kAudioFileWAVEType, $.AVAudioFileTypeKey); const startDate = $.NSDate.alloc.init; const session = $.objc_getClass("AVAudioSession").sharedInstance; let recorder = null; session.setCategoryError($.AVAudioSessionCategoryRecord, null); session.setActiveError(true, null); session.requestRecordPermission((b) => { recorder = $.objc_getClass("AVAudioRecorder").alloc.initWithURLSettingsError(outputURL, settings, null); recorder.record; }); while (startDate.timeIntervalSinceNow > -argv[1]) { runLoop = $.NSRunLoop.currentRunLoop; today = $.NSDate.dateWithTimeIntervalSinceNow(0.1); 	runLoop.runUntilDate(today); }; ; recorder.stop; flags = $.AVAudioSessionSetActiveFlags_NotifyOthersOnDeactivation; session.setActiveWithFlagsError(false, flags, null); }' "$1" $2

RecordAudio.scpt

// Reference: https://developer.apple.com/documentation/avfaudio/avaudiorecorder?language=objc
(() => {
  ObjC.import("objc");
  ObjC.import("AVFoundation");
  
  const outputURL = $.NSURL.alloc.initFileURLWithPath("/Users/exampleUser/Downloads/test.mp4");

  const settings = $.NSMutableDictionary.alloc.init
  settings.setValueForKey($.kAudioFormatAppleIMA4, $.AVFormatIDKey)
    
  const format = $.objc_getClass("AVAudioFormat").alloc.initWithSettings(settings)
  const recorder = $.objc_getClass("AVAudioRecorder").alloc.initWithURLFormatError(outputURL, format, null)

  recorder.recordForDuration(10);
})()