From 76cb9c2a39d477a64824a985ade40507e3bbade1 Mon Sep 17 00:00:00 2001
From: Adam Mathes <adam@adammathes.com>
Date: Fri, 13 Feb 2026 21:34:48 -0800
Subject: feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

---
 .../undici/lib/interceptor/response-error.js       | 95 ++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 vanilla/node_modules/undici/lib/interceptor/response-error.js

(limited to 'vanilla/node_modules/undici/lib/interceptor/response-error.js')

diff --git a/vanilla/node_modules/undici/lib/interceptor/response-error.js b/vanilla/node_modules/undici/lib/interceptor/response-error.js
new file mode 100644
index 0000000..a8105aa
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/interceptor/response-error.js
@@ -0,0 +1,95 @@
+'use strict'
+
+// const { parseHeaders } = require('../core/util')
+const DecoratorHandler = require('../handler/decorator-handler')
+const { ResponseError } = require('../core/errors')
+
+class ResponseErrorHandler extends DecoratorHandler {
+  #statusCode
+  #contentType
+  #decoder
+  #headers
+  #body
+
+  constructor (_opts, { handler }) {
+    super(handler)
+  }
+
+  #checkContentType (contentType) {
+    return (this.#contentType ?? '').indexOf(contentType) === 0
+  }
+
+  onRequestStart (controller, context) {
+    this.#statusCode = 0
+    this.#contentType = null
+    this.#decoder = null
+    this.#headers = null
+    this.#body = ''
+
+    return super.onRequestStart(controller, context)
+  }
+
+  onResponseStart (controller, statusCode, headers, statusMessage) {
+    this.#statusCode = statusCode
+    this.#headers = headers
+    this.#contentType = headers['content-type']
+
+    if (this.#statusCode < 400) {
+      return super.onResponseStart(controller, statusCode, headers, statusMessage)
+    }
+
+    if (this.#checkContentType('application/json') || this.#checkContentType('text/plain')) {
+      this.#decoder = new TextDecoder('utf-8')
+    }
+  }
+
+  onResponseData (controller, chunk) {
+    if (this.#statusCode < 400) {
+      return super.onResponseData(controller, chunk)
+    }
+
+    this.#body += this.#decoder?.decode(chunk, { stream: true }) ?? ''
+  }
+
+  onResponseEnd (controller, trailers) {
+    if (this.#statusCode >= 400) {
+      this.#body += this.#decoder?.decode(undefined, { stream: false }) ?? ''
+
+      if (this.#checkContentType('application/json')) {
+        try {
+          this.#body = JSON.parse(this.#body)
+        } catch {
+          // Do nothing...
+        }
+      }
+
+      let err
+      const stackTraceLimit = Error.stackTraceLimit
+      Error.stackTraceLimit = 0
+      try {
+        err = new ResponseError('Response Error', this.#statusCode, {
+          body: this.#body,
+          headers: this.#headers
+        })
+      } finally {
+        Error.stackTraceLimit = stackTraceLimit
+      }
+
+      super.onResponseError(controller, err)
+    } else {
+      super.onResponseEnd(controller, trailers)
+    }
+  }
+
+  onResponseError (controller, err) {
+    super.onResponseError(controller, err)
+  }
+}
+
+module.exports = () => {
+  return (dispatch) => {
+    return function Intercept (opts, handler) {
+      return dispatch(opts, new ResponseErrorHandler(opts, { handler }))
+    }
+  }
+}
-- 
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