CDK toolkit version: 1.49.1 (build 7d6321f)
Command line arguments: {
  _: [ 'synth' ],
  v: 1,
  verbose: 1,
  e: true,
  exclusively: true,
  r: undefined,
  'role-arn': undefined,
  roleArn: undefined,
  b: true,
  o: '',
  output: '',
  s: true,
  'ignore-errors': false,
  ignoreErrors: false,
  json: false,
  j: false,
  ec2creds: undefined,
  i: undefined,
  'version-reporting': undefined,
  versionReporting: undefined,
  'path-metadata': true,
  pathMetadata: true,
  'asset-metadata': true,
  assetMetadata: true,
  staging: true,
  'no-color': false,
  noColor: false,
  fail: false,
  '$0': 'cdk'
}
cdk.json: {
  "app": "npx ts-node bin/controller.ts",
  "context": {
    "@aws-cdk/core:enableStackNameDuplicates": "true",
    "aws-cdk:enableDiffNoFail": "true"
  }
}
merged settings: {
  versionReporting: true,
  pathMetadata: true,
  output: '',
  app: 'npx ts-node bin/controller.ts',
  context: {
    '@aws-cdk/core:enableStackNameDuplicates': 'true',
    'aws-cdk:enableDiffNoFail': 'true'
  },
  tags: [],
  assetMetadata: true,
  toolkitBucket: {},
  staging: true
}
Determining whether we're on an EC2 instance.
Does not look like EC2 instance.
Toolkit stack: CDKToolkit
Setting "CDK_DEFAULT_REGION" environment variable to us-west-2
Resolving default credentials
Retrieved account ID 905871336375 from disk cache
Setting "CDK_DEFAULT_ACCOUNT" environment variable to 905871336375
context: {
  '@aws-cdk/core:enableStackNameDuplicates': 'true',
  'aws-cdk:enableDiffNoFail': 'true',
  'aws:cdk:enable-path-metadata': true,
  'aws:cdk:enable-asset-metadata': true
}
unexpected: --output is required
Error: unexpected: --output is required
    at Object.execProgram (/usr/local/lib/node_modules/aws-cdk/lib/api/cxapp/exec.ts:60:11)
    at CloudExecutable.doSynthesize (/usr/local/lib/node_modules/aws-cdk/lib/api/cxapp/cloud-executable.ts:66:24)
    at CloudExecutable.synthesize (/usr/local/lib/node_modules/aws-cdk/lib/api/cxapp/cloud-executable.ts:52:29)
    at CdkToolkit.selectStacksForDiff (/usr/local/lib/node_modules/aws-cdk/lib/cdk-toolkit.ts:398:22)
    at CdkToolkit.synth (/usr/local/lib/node_modules/aws-cdk/lib/cdk-toolkit.ts:298:20)
    at main (/usr/local/lib/node_modules/aws-cdk/bin/cdk.ts:279:16)
    at initCommandLine (/usr/local/lib/node_modules/aws-cdk/bin/cdk.ts:185:9)