Proposal for new types generation in cosmwasm/ts-codegen

index.ts

export type Decimal = string;
export type Timestamp = Uint64;
export type Uint64 = string;

type ThresholdResponseAbsoluteCount = {
  absolute_count: {
    total_weight: number;
    weight: number;
  };
};

type ThresholdResponseAbsolutePercentage = {
  absolute_percentage: {
    percentage: Decimal;
    total_weight: number;
  };
};
type ThresholdResponseThresholdQuorum = {
  threshold_quorum: {
    quorum: Decimal;
    threshold: Decimal;
    total_weight: number;
  };
};

export type ThresholdResponse = ThresholdResponseAbsoluteCount | ThresholdResponseAbsolutePercentage | ThresholdResponseThresholdQuorum;

export type ExpirationAtHeigh = { at_height: number };
export type ExpirationAtTime = { at_time: Timestamp };
export type ExpirationNever = { never: {} };

export type Expiration = ExpirationAtHeigh | ExpirationAtTime | ExpirationNever;

export interface FinalInterface {
  description: string;
  expires: Expiration;
  id: number;
  proposer: string;
  threshold: ThresholdResponse;
  title: string;
}

export interface ProposalInterface<E = Expiration, T = ThresholdResponse> {
  description: string;
  expires: E extends ExpirationNever
    ? ExpirationNever
    : E extends ExpirationAtTime
    ? ExpirationAtTime
    : E extends ExpirationNever
    ? ExpirationNever
    : E;
  id: number;
  proposer: string;
  threshold: T extends ThresholdResponseAbsoluteCount
    ? ThresholdResponseAbsoluteCount
    : T extends ThresholdResponseAbsolutePercentage
    ? ThresholdResponseAbsolutePercentage
    : T extends ThresholdResponseThresholdQuorum
    ? ThresholdResponseThresholdQuorum
    : T;
  title: string;
}

const proposalResponse = {} as FinalInterface;

const firstProposal = {} as ProposalInterface<ExpirationAtHeigh, ThresholdResponseAbsoluteCount>;

proposalResponse.expires.never;
proposalResponse.threshold.absolute_count.total_weight;

firstProposal.expires.at_height;
firstProposal.threshold.absolute_count.total_weight;