Replaced fetch with node-fetch (#281)

* Replaced fetch with node-fetch

Fetch can be unavailable on some versions of node 18, this PR explicitly uses node-fetch for full backwards compatibility.

* Added changeset

* Syncronized package versions with types

* Downgraded node-fetch for CJS support

* Fixed tests for node-fetch changes

Fixed tests by mocking node-fetch instead of global fetch

* Fixed typescript warning on node-fetch mock

Author: codebycarson

.changeset/lovely-sloths-help.md

@@ -0,0 +1,5 @@
+---
+"@sei-js/mcp-server": patch
+---
+
+Explicitly use node-fetch instead of relying on users node version to have fetch

.yarn/install-state.gz

@@ -21,6 +21,7 @@
 	"devDependencies": {
 		"@types/cors": "^2.8.17",
 		"@types/express": "^5.0.0",
+		"@types/node-fetch": "^2.6.13",
 		"typescript": "^5.8.3"
 	},
 	"dependencies": {
@@ -29,6 +30,7 @@
 		"dotenv": "^16.5.0",
 		"express": "^4.21.2",
 		"jest": "^30.0.3",
+		"node-fetch": "^2.7.0",
 		"trieve-ts-sdk": "^0.0.121",
 		"tsx": "^4.20.3",
 		"viem": "^2.30.5",

packages/mcp-server/package.json

@@ -1,5 +1,6 @@
 import type { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
 import { z } from 'zod';
+import fetch from 'node-fetch';
 import type { SeiSearchResponse } from '../mintlify/types';
 
 const DOCS_SEARCH_URL = 'https://docs.sei-apis.io/search';

packages/mcp-server/src/docs/server.ts

@@ -1,6 +1,7 @@
 import type { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
 import { TrieveSDK } from 'trieve-ts-sdk';
 import { z } from 'zod';
+import fetch from 'node-fetch';
 
 import { DEFAULT_BASE_URL, SERVER_URL, SUBDOMAIN } from './config.js';
 import type { MintlifySearchConfig, SeiSearchResponse, TrieveResponse, TrieveSearchResult } from './types.js';