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Relevant code, creating a lambda & associating it with CloudFront:

directoryRetryHandler = new aws.lambda.CallbackFunction(`...`, {
  ...
}),

docsDistribution = new aws.cloudfront.Distribution(`...`, {
  defaultCacheBehavior: {
    ...
    lambdaFunctionAssociations: [{
      eventType: "origin-response",
      lambdaArn: pulumi.interpolate`${directoryRetryHandler.arn}:${directoryRetryHandler.version}`,
    }]
  }
}),

When I try to bring the stack up, AWS complains:

error creating CloudFront Distribution: InvalidLambdaFunctionAssociation: Invalid function ARN: undefined:undefined

I believe you are hitting this known issue: https://github.com/pulumi/pulumi/issues/5578 The workaround is setting the `workdir`: https://github.com/pulumi/halloumi/blob/main/nodejs/app/index.ts#L106

Ah I'll try that