NullRef on processing 'export *' in several cases

[zhuravlikjb]

Code:

class Bbb {
}

class Aaa extends Bbb { }

module Aaa {
    export class SomeType {}
}

module Bbb {
    export class SomeType { }

    export * from Aaa;      // this line causes the nullref
}

var a: Bbb.SomeType;

VS TypeScript add-on exception caught by ReSharper:

Object reference not set to an instance of an object.

--- EXCEPTION #1/2 [NullReferenceException]
Message = “Object reference not set to an instance of an object.”
ExceptionPath = Root.InnerException
ClassName = System.NullReferenceException
HResult = COR_E_NULLREFERENCE=E_POINTER=80004003
Source = Microsoft.CodeAnalysis.TypeScript.EditorFeatures
StackTraceString = “
  at Microsoft.CodeAnalysis.Editor.TypeScript.Features.CompileOnSave.CompileOnSaveHandler.<EmitAndSaveResultsAsync>d__1.MoveNext()
  --- End of stack trace from previous location where exception was thrown ---
     at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
     at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
     at Microsoft.CodeAnalysis.Editor.TypeScript.Features.CompileOnSave.CompileOnSaveHandler.<HandleFileSave>d__1.MoveNext()
  --- End of stack trace from previous location where exception was thrown ---
     at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>b__3(Object state)
     at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
     at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
”

This is what the compiler outputs:

C:\Users\Anton.Lobov\Desktop\ts-latest-github\TypeScript\built\local\tsc.js:1130
4
                if (symbol.flags & 1952 /* HasExports */ && !ts.contains(visit
                          ^
TypeError: Cannot read property 'flags' of undefined
    at visit (C:\Users\Anton.Lobov\Desktop\ts-latest-github\TypeScript\built\loc
al\tsc.js:11304:27)
    at visit (C:\Users\Anton.Lobov\Desktop\ts-latest-github\TypeScript\built\loc
al\tsc.js:11317:29)
    at getExportsForModule (C:\Users\Anton.Lobov\Desktop\ts-latest-github\TypeSc
ript\built\local\tsc.js:11299:13)
    at getExportsOfModule (C:\Users\Anton.Lobov\Desktop\ts-latest-github\TypeScr
ipt\built\local\tsc.js:11287:70)
    at getExportsOfSymbol (C:\Users\Anton.Lobov\Desktop\ts-latest-github\TypeScr
ipt\built\local\tsc.js:11283:55)
    at resolveAnonymousTypeMembers (C:\Users\Anton.Lobov\Desktop\ts-latest-githu
b\TypeScript\built\local\tsc.js:13022:31)
    at resolveObjectOrUnionTypeMembers (C:\Users\Anton.Lobov\Desktop\ts-latest-g
ithub\TypeScript\built\local\tsc.js:13049:21)
    at getTypeWithoutConstructors (C:\Users\Anton.Lobov\Desktop\ts-latest-github
\TypeScript\built\local\tsc.js:13988:32)
    at checkClassDeclaration (C:\Users\Anton.Lobov\Desktop\ts-latest-github\Type
Script\built\local\tsc.js:19364:55)
    at checkSourceElement (C:\Users\Anton.Lobov\Desktop\ts-latest-github\TypeScr
ipt\built\local\tsc.js:20108:28)

[zhuravlikjb]

One more repro of the same compiler issue, but using fully valid TS syntax:

file2.ts:

export class A {
    static r;
}

app. ts:

// empty

file1.ts:

export * from "app";  
export * from "file2";

export class A {
    static q;
}

file3.ts:

import * as X from "file1";

var s: X.A; 

X.A.q; 
X.A.r; 

Compiler emits the same exception stacktrace:

C:\Users\Anton.Lobov\Desktop\ts-latest-github\TypeScript\built\local\tsc.js:1130
4
                if (symbol.flags & 1952 /* HasExports */ && !ts.contains(visit
                          ^
TypeError: Cannot read property 'flags' of undefined
    at visit (C:\Users\Anton.Lobov\Desktop\ts-latest-github\TypeScript\built\loc
al\tsc.js:11304:27)
    at visit (C:\Users\Anton.Lobov\Desktop\ts-latest-github\TypeScript\built\loc
al\tsc.js:11317:29)
    at getExportsForModule (C:\Users\Anton.Lobov\Desktop\ts-latest-github\TypeSc
ript\built\local\tsc.js:11299:13)
    at getExportsOfModule (C:\Users\Anton.Lobov\Desktop\ts-latest-github\TypeScr
ipt\built\local\tsc.js:11287:70)
    at getExportsOfSymbol (C:\Users\Anton.Lobov\Desktop\ts-latest-github\TypeScr
ipt\built\local\tsc.js:11283:55)
    at resolveEntityName (C:\Users\Anton.Lobov\Desktop\ts-latest-github\TypeScri
pt\built\local\tsc.js:11203:36)
    at getTypeFromTypeReferenceOrHeritageClauseElement (C:\Users\Anton.Lobov\Des
ktop\ts-latest-github\TypeScript\built\local\tsc.js:13531:34)
    at checkTypeReferenceOrHeritageClauseElement (C:\Users\Anton.Lobov\Desktop\t
s-latest-github\TypeScript\built\local\tsc.js:18068:24)
    at checkTypeReferenceNode (C:\Users\Anton.Lobov\Desktop\ts-latest-github\Typ
eScript\built\local\tsc.js:18060:20)
    at checkSourceElement (C:\Users\Anton.Lobov\Desktop\ts-latest-github\TypeScr
ipt\built\local\tsc.js:20054:28)