fix: follow signal.reason in Request (#1580)

lib/fetch/request.js

@@ -367,9 +367,9 @@ class Request {
       }
 
       if (signal.aborted) {
-        ac.abort()
+        ac.abort(signal.reason)
       } else {
-        const abort = () => ac.abort()
+        const abort = () => ac.abort(signal.reason)
         signal.addEventListener('abort', abort, { once: true })
         requestFinalizer.register(this, { signal, abort })
       }
@@ -726,12 +726,12 @@ class Request {
     // 4. Make clonedRequestObject’s signal follow this’s signal.
     const ac = new AbortController()
     if (this.signal.aborted) {
-      ac.abort()
+      ac.abort(this.signal.reason)
     } else {
       this.signal.addEventListener(
         'abort',
-        function () {
-          ac.abort()
+        () => {
+          ac.abort(this.signal.reason)
         },
         { once: true }
       )

test/fetch/request.js

@@ -8,6 +8,7 @@ const {
   Headers
 } = require('../../')
 const { kState } = require('../../lib/fetch/symbols.js')
+const hasSignalReason = !!~process.version.localeCompare('v16.14.0', undefined, { numeric: true })
 
 test('arg validation', async (t) => {
   // constructor
@@ -270,9 +271,12 @@ test('undefined signal', t => {
 
 test('pre aborted signal', t => {
   const ac = new AbortController()
-  ac.abort()
+  ac.abort('gwak')
   const req = new Request('http://asd', { signal: ac.signal })
   t.equal(req.signal.aborted, true)
+  if (hasSignalReason) {
+    t.equal(req.signal.reason, 'gwak')
+  }
   t.end()
 })
 
@@ -283,16 +287,23 @@ test('post aborted signal', t => {
   const req = new Request('http://asd', { signal: ac.signal })
   t.equal(req.signal.aborted, false)
   ac.signal.addEventListener('abort', () => {
-    t.pass()
+    if (hasSignalReason) {
+      t.equal(req.signal.reason, 'gwak')
+    } else {
+      t.pass()
+    }
   })
-  ac.abort()
+  ac.abort('gwak')
 })
 
 test('pre aborted signal cloned', t => {
   const ac = new AbortController()
-  ac.abort()
+  ac.abort('gwak')
   const req = new Request('http://asd', { signal: ac.signal }).clone()
   t.equal(req.signal.aborted, true)
+  if (hasSignalReason) {
+    t.equal(req.signal.reason, 'gwak')
+  }
   t.end()
 })
 
@@ -324,9 +335,13 @@ test('post aborted signal cloned', t => {
   const req = new Request('http://asd', { signal: ac.signal }).clone()
   t.equal(req.signal.aborted, false)
   ac.signal.addEventListener('abort', () => {
-    t.pass()
+    if (hasSignalReason) {
+      t.equal(req.signal.reason, 'gwak')
+    } else {
+      t.pass()
+    }
   })
-  ac.abort()
+  ac.abort('gwak')
 })
 
 test('Passing headers in init', (t) => {