Add extracted source directory and README navigation

extracted-source/node_modules/undici/lib/mock/mock-errors.js

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+'use strict'
+
+const { UndiciError } = require('../core/errors')
+
+const kMockNotMatchedError = Symbol.for('undici.error.UND_MOCK_ERR_MOCK_NOT_MATCHED')
+
+/**
+ * The request does not match any registered mock dispatches.
+ */
+class MockNotMatchedError extends UndiciError {
+  constructor (message) {
+    super(message)
+    Error.captureStackTrace(this, MockNotMatchedError)
+    this.name = 'MockNotMatchedError'
+    this.message = message || 'The request does not match any registered mock dispatches'
+    this.code = 'UND_MOCK_ERR_MOCK_NOT_MATCHED'
+  }
+
+  static [Symbol.hasInstance] (instance) {
+    return instance && instance[kMockNotMatchedError] === true
+  }
+
+  [kMockNotMatchedError] = true
+}
+
+module.exports = {
+  MockNotMatchedError
+}