src/exchange.ts

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+import { Account } from "./interface/account";
+import {Quote} from "./interface/quote"
+
+interface Exchange {
+    name: string;
+
+    fetchAccounts: () => Account[];
+    fetchQuote: (symbol: string) => Quote;
+}

src/interface/account.ts

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+export interface Account {
+    fetchPortfolio: () => Portfolio;
+}

src/interface/portfolio.ts

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+export interface Position {
+    readonly symbol: string;
+
+    readonly quantity: number;
+
+    readonly dateAcquired: Date;
+
+    readonly pricePaid: number;
+    readonly price: number;
+
+    readonly change: number;
+    readonly changePct: number;
+}
+
+export interface Portfolio {
+    readonly positions: Position[];
+}

src/interface/quote.ts

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+export class Quote {
+    
+}