remove some more usages of Tandem.OPTIONAL, phetsims/tandem#289

js/Announcer.ts

@@ -10,7 +10,6 @@ import Emitter from '../../axon/js/Emitter.js';
 import TEmitter from '../../axon/js/TEmitter.js';
 import optionize, { EmptySelfOptions } from '../../phet-core/js/optionize.js';
 import PhetioObject, { PhetioObjectOptions } from '../../tandem/js/PhetioObject.js';
-import Tandem from '../../tandem/js/Tandem.js';
 import IOType from '../../tandem/js/types/IOType.js';
 import NullableIO from '../../tandem/js/types/NullableIO.js';
 import NumberIO from '../../tandem/js/types/NumberIO.js';
@@ -49,8 +48,6 @@ abstract class Announcer extends PhetioObject {
   public constructor( providedOptions?: AnnouncerOptions ) {
     const options = optionize<AnnouncerOptions, SelfOptions, PhetioObjectOptions>()( {
       respectResponseCollectorProperties: true,
-
-      tandem: Tandem.OPTIONAL,
       phetioType: Announcer.AnnouncerIO,
       phetioState: false
     }, providedOptions );
@@ -66,7 +63,7 @@ abstract class Announcer extends PhetioObject {
         name: 'text',
         phetioType: NullableIO( OrIO( [ StringIO, NumberIO ] ) )
       } ],
-      tandem: options.tandem.createTandem( 'announcementCompleteEmitter' ),
+      tandem: options.tandem?.createTandem( 'announcementCompleteEmitter' ),
       phetioReadOnly: true,
       phetioDocumentation: 'The announcement that has just completed. The Utterance text could potentially differ from ' +
                            'the exact text that was announced, so both are emitted. Use `text` for an exact match of what was announced.'

js/SpeechSynthesisAnnouncer.ts

@@ -37,7 +37,6 @@ import stepTimer from '../../axon/js/stepTimer.js';
 import platform from '../../phet-core/js/platform.js';
 import Multilink from '../../axon/js/Multilink.js';
 import TEmitter from '../../axon/js/TEmitter.js';
-import Tandem from '../../tandem/js/Tandem.js';
 import IOType from '../../tandem/js/types/IOType.js';
 import NullableIO from '../../tandem/js/types/NullableIO.js';
 import validate from '../../axon/js/validate.js';
@@ -251,31 +250,29 @@ class SpeechSynthesisAnnouncer extends Announcer {
       // that is more specific to the Voicing feature.
       respectResponseCollectorProperties: false,
 
-      debug: false,
-
-      tandem: Tandem.OPTIONAL
+      debug: false
     }, providedOptions );
 
     super( options );
 
     this.debug = options.debug;
 
     this.voiceProperty = new Property<null | SpeechSynthesisVoice>( null, {
-      tandem: options.tandem.createTandem( 'voiceProperty' ),
+      tandem: options.tandem?.createTandem( 'voiceProperty' ),
       phetioValueType: NullableIO( SpeechSynthesisVoiceIO ),
       phetioState: false,
       phetioReadOnly: true,
       phetioDocumentation: 'the voice that is currently voicing responses'
     } );
     this.voiceRateProperty = new NumberProperty( 1.0, {
       range: new Range( 0.75, 2 ),
-      tandem: options.tandem.createTandem( 'voiceRateProperty' ),
+      tandem: options.tandem?.createTandem( 'voiceRateProperty' ),
       phetioState: false,
       phetioDocumentation: 'changes the rate of the voicing-feature voice'
     } );
     this.voicePitchProperty = new NumberProperty( 1.0, {
       range: new Range( 0.5, 2 ),
-      tandem: options.tandem.createTandem( 'voicePitchProperty' ),
+      tandem: options.tandem?.createTandem( 'voicePitchProperty' ),
       phetioState: false,
       phetioDocumentation: 'changes the pitch of the voicing-feature voice'
     } );
@@ -316,7 +313,7 @@ class SpeechSynthesisAnnouncer extends Announcer {
     this.enabledProperty = this.enabledComponentImplementation.enabledProperty;
 
     this.mainWindowVoicingEnabledProperty = new BooleanProperty( true, {
-      tandem: options.tandem.createTandem( 'mainWindowVoicingEnabledProperty' ),
+      tandem: options.tandem?.createTandem( 'mainWindowVoicingEnabledProperty' ),
       phetioState: false,
       phetioDocumentation: 'toggles the voicing feature on and off for the simulation screen (not the voicing preferences and toolbar controls)'
     } );