separate types

js-fp3/domain/account.d.ts

@@ -0,0 +1,53 @@
+import { Result } from '../library/result.js';
+import { Money } from './money.js';
+
+export type Account = {
+  id: string;
+  balance: Money;
+};
+
+export type OpeningBalanceMustBeNonNegative = {
+  type: 'OpeningBalanceMustBeNonNegative';
+};
+
+export type AmountMustBePositive = {
+  type: 'AmountMustBePositive';
+};
+
+export type InsufficientBalance = {
+  type: 'InsufficientBalance';
+  balance: Money;
+  amount: Money;
+};
+
+export type AccountNotFound = {
+  type: 'AccountNotFound';
+  accountId: string;
+};
+
+export type AccountError =
+  | OpeningBalanceMustBeNonNegative
+  | AmountMustBePositive
+  | InsufficientBalance
+  | AccountNotFound;
+
+export declare const openingBalanceMustBeNonNegative: OpeningBalanceMustBeNonNegative;
+
+export declare const amountMustBePositive: AmountMustBePositive;
+
+export declare const insufficientBalance: (
+  balance: Money,
+  amount: Money
+) => InsufficientBalance;
+
+export declare const accountNotFound: (accountId: string) => AccountNotFound;
+
+export declare const openAccount: (
+  id: string,
+  openingBalance: Money
+) => Result<Account, AccountError>;
+
+export declare const withdraw: (
+  account: Account,
+  amount: Money
+) => Result<Account, AccountError>;