err trace

[at-loader]: Child process failed to process the request:  TypeError: Cannot read property 'exports' of undefined
    at resolveName (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:26110:70)
    at resolveEntityName (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:26686:26)
    at Object.getTypeReferenceSerializationKind (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:45669:31)
    at serializeTypeReferenceNode (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:50023:30)
    at serializeTypeNode (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:49967:28)
    at serializeUnionOrIntersectionType (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:49989:44)
    at serializeTypeNode (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:49970:28)
    at serializeReturnTypeOfNode (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:49898:24)
    at addOldTypeMetadata (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:49767:98)
    at addTypeMetadata (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:49755:17)
    at transformAllDecoratorsOfDeclaration (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:49594:13)
    at generateClassElementDecorationExpression (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:49641:40)
    at generateClassElementDecorationExpressions (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:49621:34)
    at addClassElementDecorationStatements (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:49606:44)
    at visitClassDeclaration (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:48966:13)
    at visitTypeScript (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:48822:28)
    at visitorWorker (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:48637:24)
    at sourceElementVisitorWorker (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:48669:28)
    at saveStateAndInvoke (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:48590:27)
    at sourceElementVisitor (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:48651:20)
    at visitNodes (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:47199:48)
    at Object.visitLexicalEnvironment (/Users/badim/github/orzo/orzo-frontend/node_modules/typescript/lib/typescript.js:47232:22)

transformer.ts

import * as ts from 'typescript';


function Transformer(context: ts.TransformationContext) {
  let n = 1
  function addDecorator(node: ts.Node) {
    if (node.decorators === undefined) {
      return undefined
    }
    let newDecorators = ts.createNodeArray(node.decorators.concat())
    // const assign = ts.createPropertyAssignment("sd", ts.createLiteral(n))
    // const value = ts.createObjectLiteral([assign])
    // const decCall = ts.createCall(ts.createIdentifier('Reflect.metadata'), undefined, [ts.createLiteral("key"), value])
    // const dec = ts.createDecorator(decCall)
    // newDecorators.push(dec)
    newDecorators = ts.setTextRange(newDecorators, node.decorators)
    return newDecorators
  }

  function visitClassDeclaration(node: ts.ClassDeclaration) {
    const newDecorators = addDecorator(node)
    let newNode = ts.updateClassDeclaration(node, newDecorators, node.modifiers, 
        node.name, node.typeParameters, node.heritageClauses || [], node.members)
    
    return ts.setTextRange(newNode, node)

  }

  function visitor(node: ts.Node): ts.VisitResult<ts.Node> {
    switch (node.kind) {
      case ts.SyntaxKind.ClassDeclaration:
        return visitClassDeclaration(<ts.ClassDeclaration>node)
      default:
        return node
    }
  }

  function transform(source: ts.SourceFile): ts.SourceFile {
    if (source.isDeclarationFile) {
      return source
    }
    const newStatements = ts.visitLexicalEnvironment(source.statements, visitor, context)
    const newNode = ts.updateSourceFileNode(source, ts.setTextRange(newStatements, source.statements))
    return newNode

  }
  return transform
}


function TranformerFactory(context: ts.TransformationContext) {
  const tran = Transformer(context)
  return tran;
}

export default function (): ts.CustomTransformers {
  return {
    before: [TranformerFactory]
  }
}