fix: improve error serialization

packages/vitest/src/runtime/error.ts

@@ -5,6 +5,14 @@ import { deepClone, getType } from '../utils'
 
 const OBJECT_PROTO = Object.getPrototypeOf({})
 
+function getUnserializableMessage(err: unknown) {
+  if (err instanceof Error)
+    return `<unserializable>: ${err.message}`
+  if (typeof err === 'string')
+    return `<unserializable>: ${err}`
+  return '<unserializable>'
+}
+
 // https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm
 export function serializeError(val: any, seen = new WeakMap()): any {
   if (!val || typeof val === 'string')
@@ -13,7 +21,7 @@ export function serializeError(val: any, seen = new WeakMap()): any {
     return `Function<${val.name}>`
   if (typeof val !== 'object')
     return val
-  if (val instanceof Promise || 'then' in val || (val.constructor && val.constructor.prototype === 'AsyncFunction'))
+  if (val instanceof Promise || (val.constructor && val.constructor.prototype === 'AsyncFunction'))
     return 'Promise'
   if (typeof Element !== 'undefined' && val instanceof Element)
     return val.tagName
@@ -27,7 +35,12 @@ export function serializeError(val: any, seen = new WeakMap()): any {
     const clone: any[] = new Array(val.length)
     seen.set(val, clone)
     val.forEach((e, i) => {
-      clone[i] = serializeError(e, seen)
+      try {
+        clone[i] = serializeError(e, seen)
+      }
+      catch (err) {
+        clone[i] = getUnserializableMessage(err)
+      }
     })
     return clone
   }
@@ -40,8 +53,16 @@ export function serializeError(val: any, seen = new WeakMap()): any {
     let obj = val
     while (obj && obj !== OBJECT_PROTO) {
       Object.getOwnPropertyNames(obj).forEach((key) => {
-        if (!(key in clone))
+        if ((key in clone))
+          return
+        try {
           clone[key] = serializeError(obj[key], seen)
+        }
+        catch (err) {
+          // delete in case it has a setter from prototype that might throw
+          delete clone[key]
+          clone[key] = getUnserializableMessage(err)
+        }
       })
       obj = Object.getPrototypeOf(obj)
     }
@@ -54,7 +75,7 @@ function normalizeErrorMessage(message: string) {
 }
 
 export function processError(err: any) {
-  if (!err)
+  if (!err || typeof err !== 'object')
     return err
   // stack is not serialized in worker communication
   // we stringify it first

test/core/test/serialize.test.ts

@@ -93,4 +93,36 @@ describe('error serialize', () => {
       toString: 'Function<toString>',
     })
   })
+
+  it('Should not fail on errored getters/setters', () => {
+    const error = new Error('test')
+    Object.defineProperty(error, 'unserializable', {
+      get() {
+        throw new Error('I am unserializable')
+      },
+      set() {
+        throw new Error('I am unserializable')
+      },
+    })
+    Object.defineProperty(error, 'array', {
+      value: [{
+        get name() {
+          throw new Error('name cannnot be accessed')
+        },
+      }],
+    })
+    expect(serializeError(error)).toEqual({
+      array: [
+        {
+          name: '<unserializable>: name cannnot be accessed',
+        },
+      ],
+      constructor: 'Function<Error>',
+      message: 'test',
+      name: 'Error',
+      stack: expect.stringContaining('Error: test'),
+      toString: 'Function<toString>',
+      unserializable: '<unserializable>: I am unserializable',
+    })
+  })
 })