fix: overwrite preset when standard or basic chosen

packages/@aws-cdk/aws-ivs-alpha/lib/channel.ts

@@ -141,6 +141,7 @@ export interface ChannelProps {
 
   /**
    * An optional transcode preset for the channel. Can be used for ADVANCED_HD and ADVANCED_SD channel types.
+   * When LOW or STANDARD is used, the preset will be overridden and set to none regardless of the value provided.
    *
    * @default - Preset.HIGHER_BANDWIDTH_DELIVERY if channelType is ADVANCED_SD or ADVANCED_HD, none otherwise
    */
@@ -200,16 +201,20 @@ export class Channel extends ChannelBase {
       throw new Error(`channelName must contain only numbers, letters, hyphens and underscores, got: '${this.physicalName}'`);
     }
 
+    let preset;
+
     if (props.type && [ChannelType.STANDARD, ChannelType.BASIC].includes(props.type) && props.preset) {
-      throw new Error('preset cannot be used when STANDARD or BASIC channel type');
+      preset = '';
+    } else {
+      preset = props.preset;
     }
 
     const resource = new CfnChannel(this, 'Resource', {
       authorized: props.authorized,
       latencyMode: props.latencyMode,
       name: this.physicalName,
       type: props.type,
-      preset: props.preset,
+      preset,
     });
 
     this.channelArn = resource.attrArn;

packages/@aws-cdk/aws-ivs-alpha/test/integ.ivs-channel-advanced.js.snapshot/aws-cdk-ivs.template.json

@@ -14,6 +14,14 @@
     "Preset": "CONSTRAINED_BANDWIDTH_DELIVERY",
     "Type": "ADVANCED_HD"
    }
+  },
+  "StandardChannelWithPresetSetting45FDEBBB": {
+   "Type": "AWS::IVS::Channel",
+   "Properties": {
+    "Name": "aws-cdk-ivsStandardChannelWithPresetSetting2553AADD",
+    "Preset": "",
+    "Type": "STANDARD"
+   }
   }
  },
  "Outputs": {
@@ -38,6 +46,17 @@
    "Export": {
     "Name": "aws-cdk-ivs:ExportsOutputFnGetAttAdvancedChannelWithPresetSetting5981FCA9Arn6ED27899"
    }
+  },
+  "ExportsOutputFnGetAttStandardChannelWithPresetSetting45FDEBBBArn94DAE976": {
+   "Value": {
+    "Fn::GetAtt": [
+     "StandardChannelWithPresetSetting45FDEBBB",
+     "Arn"
+    ]
+   },
+   "Export": {
+    "Name": "aws-cdk-ivs:ExportsOutputFnGetAttStandardChannelWithPresetSetting45FDEBBBArn94DAE976"
+   }
   }
  },
  "Parameters": {

packages/@aws-cdk/aws-ivs-alpha/test/integ.ivs-channel-advanced.ts

@@ -15,6 +15,11 @@ const advancedChannelWithPresetSetting = new ivs.Channel(stack, 'AdvancedChannel
   preset: ivs.Preset.CONSTRAINED_BANDWIDTH_DELIVERY,
 });
 
+const standardChannelWithPresetSetting = new ivs.Channel(stack, 'StandardChannelWithPresetSetting', {
+  type: ivs.ChannelType.STANDARD,
+  preset: ivs.Preset.CONSTRAINED_BANDWIDTH_DELIVERY,
+});
+
 const test = new integ.IntegTest(app, 'ivs-test', {
   testCases: [stack],
 });
@@ -39,4 +44,14 @@ test.assertions.awsApiCall('IVS', 'GetChannel', {
     },
   }));
 
+test.assertions.awsApiCall('IVS', 'GetChannel', {
+  arn: standardChannelWithPresetSetting.channelArn,
+})
+  .expect(integ.ExpectedResult.objectLike({
+    channel: {
+      preset: '',
+      type: 'STANDARD',
+    },
+  }));
+
 app.synth();