fix: use-readonly-types for oneof unions

[jonaskello]

This is a follow up PR to #691 that adds missing readonly modifiers for oneof fields when the oneof=unions option is active.

Previously it would generate code like this:

export interface Entity {
  readonly intVal: number;
  readonly stringVal: string;
  oneOfValue?: { $case: "theStringValue"; theStringValue: string } | {
    $case: "theIntValue";
    theIntValue: number;
  };
}

With this PR it now properly generates like this:

export interface Entity {
  readonly intVal: number;
  readonly stringVal: string;
  readonly oneOfValue?: { readonly $case: "theStringValue"; readonly theStringValue: string } | {
    readonly $case: "theIntValue";
    readonly theIntValue: number;
  };
}

[stephenh]

Thanks!

[jonaskello]

@stephenh Thanks for the collaborator status :-). Should I use "Squash and merge" when merging or what do you prefer?

[stephenh]

@jonaskello yep, I like squash and merge. Thanks!

[stephenh]

🎉 This PR is included in version 1.132.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release
• v1.132.1

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