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[wasm][debugger] Remove JToken properties that are for internal use only #75958

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Merged
ilonatommy merged 10 commits into from
Oct 19, 2022
Merged

[wasm][debugger] Remove JToken properties that are for internal use only #75958

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93911d9
Keep underscore removable properties as constants.
ilonatommy Sep 29, 2022
5765bed
Clean up before exposing externally.
ilonatommy Sep 29, 2022
00ff482
Value types need cleanup as well.
ilonatommy Sep 30, 2022
14a2be2
Fixed RootHidden tests.
ilonatommy Sep 30, 2022
c1396f7
Merge branch 'main' into remove-underscore-fields
ilonatommy Sep 30, 2022
c49e7ea
Applied a variation of @radical's idea.
ilonatommy Oct 12, 2022
8c77f58
Fix tests.
ilonatommy Oct 12, 2022
ea381f8
Reverted to @radical's version.
ilonatommy Oct 13, 2022
0effee7
Revert 14a2be2eca82e0848e73130d7a8405e0f99f62bd.
ilonatommy Oct 14, 2022
bf636fd
Applied radical's suggestions.
ilonatommy Oct 19, 2022
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17 changes: 17 additions & 0 deletions src/mono/wasm/debugger/BrowserDebugProxy/Common/HelperExtensions.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,13 +5,27 @@

using System;
using Newtonsoft.Json.Linq;
using BrowserDebugProxy;
using System.Collections.Generic;
using System.Linq;

namespace Microsoft.WebAssembly.Diagnostics;

internal static class HelperExtensions
{
private const int MaxLogMessageLineLength = 65536;
private static readonly bool TruncateLogMessages = string.IsNullOrEmpty(Environment.GetEnvironmentVariable("WASM_DONT_TRUNCATE_LOG_MESSAGES"));
private static Dictionary<ProxyInternalUseProperty, string> proxyInternalUsePropNames = new Dictionary<ProxyInternalUseProperty, string>() {
{ ProxyInternalUseProperty.Hidden, "__hidden" },
{ ProxyInternalUseProperty.State, "__state" },
{ ProxyInternalUseProperty.Section, "__section" },
{ ProxyInternalUseProperty.Owner, "__owner" },
{ ProxyInternalUseProperty.IsStatic, "__isStatic" },
{ ProxyInternalUseProperty.IsNewSlot, "__isNewSlot" },
{ ProxyInternalUseProperty.IsBackingField, "__isBackingField" },
{ ProxyInternalUseProperty.ParentTypeId, "__parentTypeId" }
};
private static Dictionary<string, ProxyInternalUseProperty> proxyInternalUsePropNamesInverse = proxyInternalUsePropNames.ToDictionary((i) => i.Value, (i) => i.Key);

public static string Truncate(this string message, int maxLen, string suffix = "")

Expand All @@ -29,6 +43,9 @@ public static void AddRange(this JArray arr, JArray addedArr)
arr.Add(item);
}

public static string ToUnderscoredString(this ProxyInternalUseProperty key) => proxyInternalUsePropNames[key];
public static bool TryConvertToProxyInternalUseProperty(this string key) => proxyInternalUsePropNamesInverse.TryGetValue(key, out _);

public static bool IsNullValuedObject(this JObject obj)
=> obj != null && obj["type"]?.Value<string>() == "object" && obj["subtype"]?.Value<string>() == "null";
}
82 changes: 59 additions & 23 deletions src/mono/wasm/debugger/BrowserDebugProxy/MemberObjectsExplorer.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -63,17 +63,17 @@ private static async Task<JObject> ReadFieldValue(
// for backing fields, we are getting it from the properties
typePropertiesBrowsableInfo.TryGetValue(field.Name, out state);
}
fieldValue["__state"] = state?.ToString();
fieldValue["__section"] = field.Attributes.HasFlag(FieldAttributes.Private)
fieldValue[ProxyInternalUseProperty.State.ToUnderscoredString()] = state?.ToString();
fieldValue[ProxyInternalUseProperty.Section.ToUnderscoredString()] = field.Attributes.HasFlag(FieldAttributes.Private)
? "private" : "result";

if (field.IsBackingField)
{
fieldValue["__isBackingField"] = true;
fieldValue["__parentTypeId"] = parentTypeId;
fieldValue[ProxyInternalUseProperty.IsBackingField.ToUnderscoredString()] = true;
fieldValue[ProxyInternalUseProperty.ParentTypeId.ToUnderscoredString()] = parentTypeId;
}
if (field.Attributes.HasFlag(FieldAttributes.Static))
fieldValue["__isStatic"] = true;
fieldValue[ProxyInternalUseProperty.IsStatic.ToUnderscoredString()] = true;

if (getObjectOptions.HasFlag(GetObjectCommandOptions.WithSetter))
{
Expand Down Expand Up @@ -125,6 +125,8 @@ private static async Task<JArray> GetRootHiddenChildren(
if (rootValue?["type"]?.Value<string>() != "object")
return new JArray();

int? maxSize = null;

// unpack object/valuetype
if (rootObjectId.Scheme is "object" or "valuetype")
{
Expand All @@ -150,8 +152,9 @@ private static async Task<JArray> GetRootHiddenChildren(
{
// a collection - expose elements to be of array scheme
var memberNamedItems = members
.Where(m => m["name"]?.Value<string>() == "Items" || m["name"]?.Value<string>() == "_items")
.FirstOrDefault();
.FirstOrDefault(m => m["name"]?.Value<string>() == "Items" || m["name"]?.Value<string>() == "_items");
// sometimes items have dummy empty elements added after real items
maxSize = members.FirstOrDefault(m => m["name"]?.Value<string>() == "_size")?["value"]?["value"]?.Value<int>();
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@radical radical Oct 3, 2022

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What is this doing? And who adds _size, and _items?

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@radical radical Oct 3, 2022

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Ok, so these are private fields for List<T>. We shouldn't depend on a type's private members like this. What do the "dummy empty elements" look like?

The error condition can be recreated by a = new List<int>(capacity: 20); a.Add(1); -> now the internal array _items will be of size 20, but it will have only 1 real value.

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@radical radical Oct 3, 2022

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Does VS show all the elements in _items?

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btw, you can use list.Capacity to know the size of _items.

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@ilonatommy ilonatommy Oct 12, 2022 •
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We have 2 behaviors in DebuggerTests.EvaluateOnCallFrameTests.EvaluateBrowsableRootHidden. The data:

[InlineData("EvaluateBrowsableClass", "TestEvaluateFieldsRootHidden", "testFieldsRootHidden", 10)]
[InlineData("EvaluateBrowsableClass", "TestEvaluatePropertiesRootHidden", "testPropertiesRootHidden", 10)]
[InlineData("EvaluateBrowsableStruct", "TestEvaluatePropertiesRootHidden", "testPropertiesRootHidden", 10)]
[InlineData("EvaluateBrowsableClassStatic", "TestEvaluateFieldsRootHidden", "testFieldsRootHidden", 10)]
[InlineData("EvaluateBrowsableClassStatic", "TestEvaluatePropertiesRootHidden", "testPropertiesRootHidden", 10)]
[InlineData("EvaluateBrowsableStructStatic", "TestEvaluateFieldsRootHidden", "testFieldsRootHidden", 10)]
[InlineData("EvaluateBrowsableStructStatic", "TestEvaluatePropertiesRootHidden", "testPropertiesRootHidden", 10)]
[InlineData("EvaluateBrowsableNonAutoPropertiesClass", "TestEvaluatePropertiesRootHidden", "testPropertiesRootHidden", 5)]
[InlineData("EvaluateBrowsableNonAutoPropertiesClassStatic", "TestEvaluatePropertiesRootHidden", "testPropertiesRootHidden", 5)]

result in producing the information you are talking about. On calling GetObjectMemberValues for listRootHidden in GetRootHiddenChildren we get a publicly available object that looks like this:

  "value": {
    "type": "object",
    "value": null,
    "description": "int[2]",
    "className": "int[]",
    "objectId": "dotnet:array:22",
    "subtype": "array"
  },
  "writable": false,
  "name": "Items",
  "isOwn": true,
  "__section__": "result",
  "__state__": null,
  "__parentTypeId__": 2,
  "__isNewSlot__": false
}

and it does not cause any problems: array has only two elements, it's public and always named Items, so after calling
JArray resultValue = await sdbHelper.GetArrayValues(rootObjectId.Value, token); on it, we will get the items we should expose.
However for these cases:

[InlineData("EvaluateBrowsableStruct", "TestEvaluateFieldsRootHidden", "testFieldsRootHidden", 10)]
[InlineData("EvaluateBrowsableNonAutoPropertiesStruct", "TestEvaluatePropertiesRootHidden", "testPropertiesRootHidden", 5)]
[InlineData("EvaluateBrowsableNonAutoPropertiesStructStatic", "TestEvaluatePropertiesRootHidden", "testPropertiesRootHidden", 5)]

we are getting only following private objects:

{
  "value": {
    "type": "object",
    "value": null,
    "description": "int[4]",
    "className": "int[]",
    "objectId": "dotnet:array:46",
    "subtype": "array"
  },
  "writable": false,
  "isOwn": true,
  "name": "_items",
  "__state__": null,
  "__section__": "private"
}
{
  "value": {
    "type": "number",
    "value": 2,
    "description": "2"
  },
  "writable": true,
  "isOwn": true,
  "name": "_size",
  "__state__": null,
  "__section__": "private"
}
{
  "value": {
    "type": "number",
    "value": 2,
    "description": "2"
  },
  "writable": true,
  "isOwn": true,
  "name": "_version",
  "__state__": null,
  "__section__": "private"
}
{
  "value": {
    "type": "object",
    "value": null,
    "description": "int[0]",
    "className": "int[]",
    "objectId": "dotnet:array:66",
    "subtype": "array"
  },
  "writable": false,
  "isOwn": true,
  "name": "s_emptyArray",
  "__state__": null,
  "__section__": "private",
  "__isStatic__": true
}

The only way to get access to children of the hidden root is to call GetArrayValues on private _items object. As you can see, it has 4 elements even though the size of the list == 2, they are like this (empty elements always in the end):

{
  "value": {
    "type": "number",
    "value": 1,
    "description": "1"
  },
  "writable": true,
  "name": "0"
}
{
  "value": {
    "type": "number",
    "value": 2,
    "description": "2"
  },
  "writable": true,
  "name": "1"
}
{
  "value": {
    "type": "number",
    "value": 0,
    "description": "0"
  },
  "writable": true,
  "name": "2"
}
{
  "value": {
    "type": "number",
    "value": 0,
    "description": "0"
  },
  "writable": true,
  "name": "3"
}

In Console Application we see the same data when we expand private members.
image

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@ilonatommy ilonatommy Oct 12, 2022 •
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btw, you can use list.Capacity to know the size of _items.

In the screenshot above we can se it would not work, capacity is 4 even though our array has only 2 elements. Count is fine but we don't have it in available members.

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@ilonatommy ilonatommy Oct 14, 2022 •
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ToDo: check what is failing without this change and why it was not failing before clearing the __ fields.

Edit: answer is - EvaluateBrowsableRootHidden is failing on main:

  Failed DebuggerTests.EvaluateOnCallFrameTests.EvaluateBrowsableRootHidden(outerClassName: "EvaluateBrowsableClassStatic", className: "TestEvaluatePropertiesRootHidden", localVarName: "testPropertiesRootHidden", breakLine: 10) [993 ms]
  Error Message:
   Assert.Equal() Failure
Expected: 10
Actual:   8
Failed:     1, Passed:    11, Skipped:     0, Total:    12

Reason:
refListElementsProp has 4 elements while it should have only 2 (it has 2 empty reserved places in memory as discussed before and they are being returned along with legible list members).

What now:
I will make a separate PR for it and revert the changes here. We will merge the other PR first.

if (memberNamedItems is not null &&
(DotnetObjectId.TryParse(memberNamedItems["value"]?["objectId"]?.Value<string>(), out DotnetObjectId itemsObjectId)) &&
itemsObjectId.Scheme == "array")
Expand All @@ -164,6 +167,8 @@ private static async Task<JArray> GetRootHiddenChildren(
if (rootObjectId.Scheme == "array")
{
JArray resultValue = await sdbHelper.GetArrayValues(rootObjectId.Value, token);
if (maxSize is not null)
resultValue = new JArray(resultValue.Take(maxSize.Value));

// root hidden item name has to be unique, so we concatenate the root's name to it
foreach (var item in resultValue)
Expand Down Expand Up @@ -282,6 +287,8 @@ public static async Task<JArray> GetExpandedMemberValues(
{
if (state is DebuggerBrowsableState.RootHidden)
{
if (namePrefix == "valueTypeEnumRootHidden")
Console.WriteLine($"namePrefix = {namePrefix}; typeName = {typeName}");
if (MonoSDBHelper.IsPrimitiveType(typeName))
return GetHiddenElement();

Expand Down Expand Up @@ -361,14 +368,14 @@ public static async Task<Dictionary<string, JObject>> ExpandPropertyValues(
continue;
}

bool isExistingMemberABackingField = existingMember["__isBackingField"]?.Value<bool>() == true;
bool isExistingMemberABackingField = existingMember[ProxyInternalUseProperty.IsBackingField.ToUnderscoredString()]?.Value<bool>() == true;
if (isOwn && !isExistingMemberABackingField)
{
// repeated propname on the same type! cannot happen
throw new Exception($"Internal Error: should not happen. propName: {propName}. Existing all members: {string.Join(",", allMembers.Keys)}");
}

bool isExistingMemberABackingFieldOwnedByThisType = isExistingMemberABackingField && existingMember["__owner"]?.Value<string>() == typeName;
bool isExistingMemberABackingFieldOwnedByThisType = isExistingMemberABackingField && existingMember[ProxyInternalUseProperty.Owner.ToUnderscoredString()]?.Value<string>() == typeName;
if (isExistingMemberABackingField && (isOwn || isExistingMemberABackingFieldOwnedByThisType))
{
// this is the property corresponding to the backing field in *this* type
Expand All @@ -382,8 +389,8 @@ public static async Task<Dictionary<string, JObject>> ExpandPropertyValues(
{
// this has `new` keyword if it is newSlot but direct child was not a newSlot:
var child = allMembers.FirstOrDefault(
kvp => (kvp.Key == propName || kvp.Key.StartsWith($"{propName} (")) && kvp.Value["__parentTypeId"]?.Value<int>() == typeId).Value;
bool wasOverriddenByDerivedType = child != null && child["__isNewSlot"]?.Value<bool>() != true;
kvp => (kvp.Key == propName || kvp.Key.StartsWith($"{propName} (")) && kvp.Value[ProxyInternalUseProperty.ParentTypeId.ToUnderscoredString()]?.Value<int>() == typeId).Value;
bool wasOverriddenByDerivedType = child != null && child[ProxyInternalUseProperty.IsNewSlot.ToUnderscoredString()]?.Value<bool>() != true;
if (wasOverriddenByDerivedType)
{
/*
Expand All @@ -409,7 +416,7 @@ public static async Task<Dictionary<string, JObject>> ExpandPropertyValues(
*/

JObject backingFieldForHiddenProp = allMembers.GetValueOrDefault(overriddenOrHiddenPropName);
if (backingFieldForHiddenProp is null || backingFieldForHiddenProp["__isBackingField"]?.Value<bool>() != true)
if (backingFieldForHiddenProp is null || backingFieldForHiddenProp[ProxyInternalUseProperty.IsBackingField.ToUnderscoredString()]?.Value<bool>() != true)
{
// hiding with a non-auto property, so nothing to adjust
// add the new property
Expand All @@ -424,12 +431,12 @@ public static async Task<Dictionary<string, JObject>> ExpandPropertyValues(

async Task UpdateBackingFieldWithPropertyAttributes(JObject backingField, string autoPropName, MethodAttributes getterMemberAccessAttrs, DebuggerBrowsableState? state)
{
backingField["__section"] = getterMemberAccessAttrs switch
backingField[ProxyInternalUseProperty.Section.ToUnderscoredString()] = getterMemberAccessAttrs switch
{
MethodAttributes.Private => "private",
_ => "result"
};
backingField["__state"] = state?.ToString();
backingField[ProxyInternalUseProperty.State.ToUnderscoredString()] = state?.ToString();

if (state is null)
return;
Expand Down Expand Up @@ -472,16 +479,16 @@ async Task AddProperty(
}

propRet["isOwn"] = isOwn;
propRet["__section"] = getterAttrs switch
propRet[ProxyInternalUseProperty.Section.ToUnderscoredString()] = getterAttrs switch
{
MethodAttributes.Private => "private",
_ => "result"
};
propRet["__state"] = state?.ToString();
propRet[ProxyInternalUseProperty.State.ToUnderscoredString()] = state?.ToString();
if (parentTypeId != -1)
{
propRet["__parentTypeId"] = parentTypeId;
propRet["__isNewSlot"] = isNewSlot;
propRet[ProxyInternalUseProperty.ParentTypeId.ToUnderscoredString()] = parentTypeId;
propRet[ProxyInternalUseProperty.IsNewSlot.ToUnderscoredString()] = isNewSlot;
}

string namePrefix = GetNamePrefixForValues(propNameWithSufix, typeName, isOwn, state);
Expand Down Expand Up @@ -586,7 +593,7 @@ public static async Task<GetMembersResult> GetObjectMemberValues(
if (getCommandType.HasFlag(GetObjectCommandOptions.AccessorPropertiesOnly))
{
foreach (var f in allFields)
f["__hidden"] = true;
f[ProxyInternalUseProperty.Hidden.ToUnderscoredString()] = true;
}
AddOnlyNewFieldValuesByNameTo(allFields, allMembers, typeName, isOwn);
}
Expand Down Expand Up @@ -632,8 +639,8 @@ static void AddOnlyNewFieldValuesByNameTo(JArray namedValues, IDictionary<string
if (valuesDict.TryAdd(name, item as JObject))
{
// new member
if (item["__isBackingField"]?.Value<bool>() == true)
item["__owner"] = typeName;
if (item[ProxyInternalUseProperty.IsBackingField.ToUnderscoredString()]?.Value<bool>() == true)
item[ProxyInternalUseProperty.Owner.ToUnderscoredString()] = typeName;
continue;
}

Expand All @@ -650,6 +657,18 @@ static void AddOnlyNewFieldValuesByNameTo(JArray namedValues, IDictionary<string

}

public enum ProxyInternalUseProperty
{
Hidden,
State,
Section,
Owner,
IsStatic,
IsNewSlot,
IsBackingField,
ParentTypeId
}

internal sealed class GetMembersResult
{
// public / protected / internal:
Expand All @@ -676,6 +695,23 @@ public GetMembersResult(JArray value, bool sortByAccessLevel)
PrivateMembers = t.PrivateMembers;
}

public void CleanUp()
{
CleanUpJArray(Result);
CleanUpJArray(PrivateMembers);
static void CleanUpJArray(JArray arr)
{
foreach(var item in arr)
{
item.Children().Where(x =>
x is JProperty p &&
p.Name.TryConvertToProxyInternalUseProperty())
.ToList()
.ForEach(x => x.Remove());
}
}
}

public static GetMembersResult FromValues(IEnumerable<JToken> values, bool splitMembersByAccessLevel = false) =>
FromValues(new JArray(values), splitMembersByAccessLevel);

Expand All @@ -694,10 +730,10 @@ public static GetMembersResult FromValues(JArray values, bool splitMembersByAcce

private void Split(JToken member)
{
if (member["__hidden"]?.Value<bool>() == true)
if (member[ProxyInternalUseProperty.Hidden.ToUnderscoredString()]?.Value<bool>() == true)
return;

if (member["__section"]?.Value<string>() is not string section)
if (member[ProxyInternalUseProperty.Section.ToUnderscoredString()]?.Value<string>() is not string section)
{
Result.Add(member);
return;
Expand Down
2 changes: 2 additions & 0 deletions src/mono/wasm/debugger/BrowserDebugProxy/MonoProxy.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -765,6 +765,7 @@ internal async Task<ValueOrError<GetMembersResult>> RuntimeGetObjectMembers(Sess
case "valuetype":
var resValue = await MemberObjectsExplorer.GetValueTypeMemberValues(
context.SdbAgent, objectId.Value, getObjectOptions, token, sortByAccessLevel, includeStatic: true);
resValue?.CleanUp();
return resValue switch
{
null => ValueOrError<GetMembersResult>.WithError($"Could not get properties for {objectId}"),
Expand All @@ -779,6 +780,7 @@ internal async Task<ValueOrError<GetMembersResult>> RuntimeGetObjectMembers(Sess
case "object":
var resObj = await MemberObjectsExplorer.GetObjectMemberValues(
context.SdbAgent, objectId.Value, getObjectOptions, token, sortByAccessLevel, includeStatic: true);
resObj.CleanUp();
return ValueOrError<GetMembersResult>.WithValue(resObj);
case "pointer":
var resPointer = new JArray { await context.SdbAgent.GetPointerContent(objectId.Value, token) };
Expand Down
6 changes: 3 additions & 3 deletions src/mono/wasm/debugger/BrowserDebugProxy/ValueTypeClass.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -98,15 +98,15 @@ JObject GetFieldWithMetadata(FieldTypeClass field, JObject fieldValue, bool isSt
if (isStatic)
fieldValue["name"] = field.Name;
FieldAttributes attr = field.Attributes & FieldAttributes.FieldAccessMask;
fieldValue["__section"] = attr == FieldAttributes.Private ? "private" : "result";
fieldValue[ProxyInternalUseProperty.Section.ToUnderscoredString()] = attr == FieldAttributes.Private ? "private" : "result";

if (field.IsBackingField)
{
fieldValue["__isBackingField"] = true;
fieldValue[ProxyInternalUseProperty.IsBackingField.ToUnderscoredString()] = true;
return fieldValue;
}
typeFieldsBrowsableInfo.TryGetValue(field.Name, out DebuggerBrowsableState? state);
fieldValue["__state"] = state?.ToString();
fieldValue[ProxyInternalUseProperty.State.ToUnderscoredString()] = state?.ToString();
return fieldValue;
}
}
Expand Down
6 changes: 4 additions & 2 deletions src/mono/wasm/debugger/DebuggerTestSuite/EvaluateOnCallFrameTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1181,9 +1181,11 @@ public async Task EvaluateBrowsableRootHidden(
var (refList, _) = await EvaluateOnCallFrame(id, "testPropertiesNone.list");
var refListProp = await GetProperties(refList["objectId"]?.Value<string>());
var list = refListProp
.Where(v => v["name"]?.Value<string>() == "Items" || v["name"]?.Value<string>() == "_items")
.FirstOrDefault();
.FirstOrDefault(v => v["name"]?.Value<string>() == "Items" || v["name"]?.Value<string>() == "_items");
var refListElementsProp = await GetProperties(list["value"]["objectId"]?.Value<string>());
int? listMaxSize = refListProp.FirstOrDefault(m => m["name"]?.Value<string>() == "_size")?["value"]?["value"]?.Value<int>();
if (listMaxSize is not null)
refListElementsProp = new JArray(refListElementsProp.Take(listMaxSize.Value));

var (refArray, _) = await EvaluateOnCallFrame(id, "testPropertiesNone.array");
var refArrayProp = await GetProperties(refArray["objectId"]?.Value<string>());
Expand Down