fix: use npm install (#77)

node_modules/undici/lib/mock/mock-symbols.js

@@ -0,0 +1,23 @@
+'use strict'
+
+module.exports = {
+  kAgent: Symbol('agent'),
+  kOptions: Symbol('options'),
+  kFactory: Symbol('factory'),
+  kDispatches: Symbol('dispatches'),
+  kDispatchKey: Symbol('dispatch key'),
+  kDefaultHeaders: Symbol('default headers'),
+  kDefaultTrailers: Symbol('default trailers'),
+  kContentLength: Symbol('content length'),
+  kMockAgent: Symbol('mock agent'),
+  kMockAgentSet: Symbol('mock agent set'),
+  kMockAgentGet: Symbol('mock agent get'),
+  kMockDispatch: Symbol('mock dispatch'),
+  kClose: Symbol('close'),
+  kOriginalClose: Symbol('original agent close'),
+  kOrigin: Symbol('origin'),
+  kIsMockActive: Symbol('is mock active'),
+  kNetConnect: Symbol('net connect'),
+  kGetNetConnect: Symbol('get net connect'),
+  kConnected: Symbol('connected')
+}