Array parameters should be readonly

[jeengbe]

The code that's generated does not use readonly in places where it should:

export declare class BatchGetAccountsRequest extends pb_1.Message {
    #private;
    constructor(data?: any[] | {
        ids?: string[];
    });
    get ids(): string[];
    set ids(value: string[]);
    static fromObject(data: {
        ids?: string[];
    }): BatchGetAccountsRequest;
    toObject(): {
        ids?: string[];
    };
    serialize(): Uint8Array;
    serialize(w: pb_1.BinaryWriter): void;
    static deserialize(bytes: Uint8Array | pb_1.BinaryReader): BatchGetAccountsRequest;
    serializeBinary(): Uint8Array;
    static deserializeBinary(bytes: Uint8Array): BatchGetAccountsRequest;
}

All parameters should declare their arrays as readonly to work with the following example code:

  getByIds(ids: readonly string[]): Promise<Account[]> {
    return this.client
      .BatchGetAccounts(new BatchGetAccountsRequest({ ids }))
      .then((res) => res.accounts.map(accountGrpcToJs));
  }

The type 'readonly string[]' is 'readonly' and cannot be assigned to the mutable type 'string[]'.