[WIP] Implement Coin Gekko API Integration

.gitignore

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+node_modules/
+dist/
+.env
+__pycache__/
+*.log
+.DS_Store
+*.test.js
+*.test.ts

package.json

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+{
+  "name": "coin-gekko-api",
+  "version": "1.0.0",
+  "description": "Coin Gekko API",
+  "main": "dist/index.js",
+  "scripts": {
+    "build": "tsc",
+    "test": "vitest",
+    "start": "node dist/index.js"
+  },
+  "keywords": ["crypto", "api", "gekko"],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "@types/node": "^16.11.6",
+    "typescript": "^4.4.4",
+    "vitest": "^0.25.3",
+    "axios-mock-adapter": "^1.20.0"
+  },
+  "dependencies": {
+    "axios": "^0.24.0"
+  }
+}

src/index.ts

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+import axios from 'axios';
+
+export interface CoinData {
+  id: string;
+  symbol: string;
+  name: string;
+  price: number;
+  marketCap: number;
+}
+
+export class CoinGekkoApi {
+  private baseUrl: string;
+
+  constructor(baseUrl: string = 'https://api.coingecko.com/api/v3') {
+    this.baseUrl = baseUrl;
+  }
+
+  /**
+   * Fetch coin data by ID
+   * @param coinId - The ID of the coin
+   * @returns Promise resolving to CoinData
+   */
+  async getCoinById(coinId: string): Promise<CoinData> {
+    if (!coinId) {
+      throw new Error('Coin ID is required');
+    }
+
+    try {
+      const response = await axios.get(`${this.baseUrl}/coins/${coinId}`);
+      return {
+        id: response.data.id,
+        symbol: response.data.symbol,
+        name: response.data.name,
+        price: response.data.market_data.current_price.usd,
+        marketCap: response.data.market_data.market_cap.usd
+      };
+    } catch (error) {
+      if (axios.isAxiosError(error)) {
+        if (error.response?.status === 404) {
+          throw new Error(`Coin with ID ${coinId} not found`);
+        }
+        throw new Error(`API request failed: ${error.message}`);
+      }
+      throw error;
+    }
+  }
+
+  /**
+   * List top cryptocurrencies by market cap
+   * @param limit - Number of coins to retrieve (default 10)
+   * @returns Promise resolving to array of CoinData
+   */
+  async getTopCoins(limit: number = 10): Promise<CoinData[]> {
+    if (limit < 1) {
+      throw new Error('Limit must be at least 1');
+    }
+
+    try {
+      const response = await axios.get(`${this.baseUrl}/coins/markets`, {
+        params: {
+          vs_currency: 'usd',
+          order: 'market_cap_desc',
+          per_page: limit,
+          page: 1
+        }
+      });
+
+      return response.data.map((coin: any) => ({
+        id: coin.id,
+        symbol: coin.symbol,
+        name: coin.name,
+        price: coin.current_price,
+        marketCap: coin.market_cap
+      }));
+    } catch (error) {
+      throw new Error(`Failed to fetch top coins: ${error instanceof Error ? error.message : 'Unknown error'}`);
+    }
+  }
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "es2020",
+    "module": "commonjs",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "outDir": "./dist"
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "**/*.spec.ts"]
+}