add hw2

node_modules/bare-events/lib/errors.js

@@ -0,0 +1,32 @@
+module.exports = class EventEmitterError extends Error {
+  constructor(msg, code, fn = EventEmitterError, opts) {
+    super(`${code}: ${msg}`, opts)
+    this.code = code
+
+    if (Error.captureStackTrace) {
+      Error.captureStackTrace(this, fn)
+    }
+  }
+
+  get name() {
+    return 'EventEmitterError'
+  }
+
+  static OPERATION_ABORTED(cause, msg = 'Operation aborted') {
+    return new EventEmitterError(
+      msg,
+      'OPERATION_ABORTED',
+      EventEmitterError.OPERATION_ABORTED,
+      { cause }
+    )
+  }
+
+  static UNHANDLED_ERROR(cause, msg = 'Unhandled error') {
+    return new EventEmitterError(
+      msg,
+      'UNHANDLED_ERROR',
+      EventEmitterError.UNHANDLED_ERROR,
+      { cause }
+    )
+  }
+}