Just wanted to add some strawman syntax variations for comparison. To give a more complete example, each snippet describes the shape of the CertificateProperties shape from Microsoft.AppPlatform@2022-12-01.

Unions via inheritance

Based on the proposal in #9369

abstract type CertificateProperties = {
  type: string
  activateDate: string
  dnsNames: string[]
  expirationDate: string
  issuedDate: string
  issuer: string
  provisioningState: 'Creating' | 'Deleting' | 'Failed' | 'Succeeded' | 'Updating'
  subjectName: string
  thumbprint: string
}

type ContentCertificateProperties extends CertificateProperties = {
  type: 'ContentCertificate'
  content: string
}

type KeyVaultCertificateProperties extends CertificateProperties = {
  type: 'KeyVaultCertificate'
  certVersion: string
  excludePrivateKey: bool
  keyVaultCertName: string
  vaultUri: string
}

TypeScript-style discriminated unions

type ContentCertificateProperties = {
  type: 'ContentCertificate'
  activateDate: string
  dnsNames: string[]
  expirationDate: string
  issuedDate: string
  issuer: string
  provisioningState: 'Creating' | 'Deleting' | 'Failed' | 'Succeeded' | 'Updating'
  subjectName: string
  thumbprint: string
  content: string
}

type KeyVaultCertificateProperties = {
  type: 'KeyVaultCertificate'
  activateDate: string
  dnsNames: string[]
  expirationDate: string
  issuedDate: string
  issuer: string
  provisioningState: 'Creating' | 'Deleting' | 'Failed' | 'Succeeded' | 'Updating'
  subjectName: string
  thumbprint: string
  certVersion: string
  excludePrivateKey: bool
  keyVaultCertName: string
  vaultUri: string
}

type CertificateProperties = ContentCertificateProperties | KeyVaultCertificateProperties;

TypeScript-style discriminated union (but with structural inheritance via &)

type CertificatePropertiesSharedProps = {
  activateDate: string
  dnsNames: string[]
  expirationDate: string
  issuedDate: string
  issuer: string
  provisioningState: 'Creating' | 'Deleting' | 'Failed' | 'Succeeded' | 'Updating'
  subjectName: string
  thumbprint: string
}

type ContentCertificateProperties = CertificatePropertiesSharedProps & {
  type: 'ContentCertificate'
  content: string
}

type KeyVaultCertificateProperties = CertificatePropertiesSharedProps & {
  type: 'KeyVaultCertificate'
  certVersion: string
  excludePrivateKey: bool
  keyVaultCertName: string
  vaultUri: string
}

type CertificateProperties = ContentCertificateProperties | KeyVaultCertificateProperties;

Inspired by Rust enums

type CertificateProperties = {
  activateDate: string
  dnsNames: string[]
  expirationDate: string
  issuedDate: string
  issuer: string
  provisioningState: 'Creating' | 'Deleting' | 'Failed' | 'Succeeded' | 'Updating'
  subjectName: string
  thumbprint: string

  discriminator type: {
    ContentCertificate: {
      content: string
    }

    KeyVaultCertificate: {
      certVersion: string
      excludePrivateKey: bool
      keyVaultCertName: string
      vaultUri: string
    }
  }
}

Bicep version Bicep CLI version 0.15.31 (3ba6e06a8d)

Describe the bug Recently this change was released #9454 which changes the syntax and it is explained how it should be changed. When using intellisense now these properties are marked as mandatory.

To Reproduce see above

Additional context Add any other context about the problem here.

Skip Required label on nullable properties (#10242)

• Ensure nullable properties are not labeled '(Required)' or included in 'required-properties' snippet

• Add an IsRequired method to TypeHelper

Resolves #10239

This PR ensures that nullable properties are not labeled '(Required)' in the completion detail tooltip or included in the 'required-properties' completion snippet.

Microsoft Reviewers: Open in CodeFlow

@Venkat2694 I can see that the compiled templates are different, but this was a deliberate change, and both versions should work.

Can you share the details of the error you are seeing?

Update Generated Types (#1459)

Generate types for https://github.com/Azure/azure-rest-api-specs/tree/969fd0c2634fbcc1975d7abe3749330a5145a97c

Generate types for https://github.com/Azure/azure-rest-api-specs/tree/969fd0c2634fbcc1975d7abe3749330a5145a97c

Generate types for https://github.com/Azure/azure-rest-api-specs/tree/969fd0c2634fbcc1975d7abe3749330a5145a97c