message: Pull out isDefined
diff: @@ -58,6 +58,10 @@ export interface TokenConfiguration {
  readonly erc20Tokens?: ReadonlyArray<Erc20Token & { readonly name: string }>;
  }
  +function isDefined<X>(value: X | undefined): value is X {
  + return value !== undefined;
  +}
  +
  export class CosmWasmConnection implements BlockchainConnection {
  // we must know prefix and tokens a priori to understand the chain
  public static async establish(
  @@ -288,17 +292,17 @@ export class CosmWasmConnection implements BlockchainConnection {
  signedBy,
  tags,
  }: TransactionQuery): Promise<readonly (ConfirmedTransaction<UnsignedTransaction> | FailedTransaction)[]> {
  - if ([signedBy, tags].some(component => component !== undefined)) {
  + if ([signedBy, tags].some(isDefined)) {
  throw new Error("Transaction query by signedBy or tags not yet supported");
  }
  - if ([maxHeight, minHeight].some(component => component !== undefined)) {
  + if ([maxHeight, minHeight].some(isDefined)) {
  throw new Error(
  "Transaction query by minHeight/maxHeight not yet supported. This is due to missing flexibility of the Gaia REST API, see https://github.com/cosmos/gaia/issues/75",
  );
  }
  - if ([id, height, sentFromOrTo].filter(component => component !== undefined).length !== 1) {
  + if ([id, height, sentFromOrTo].filter(isDefined).length !== 1) {
  throw new Error(
  "Transaction query by id, height and sentFromOrTo is mutually exclusive. Exactly one must be set.",
  );
  