diff --git a/libs/remix-debug/src/solidity-decoder/internalCallTree.ts b/libs/remix-debug/src/solidity-decoder/internalCallTree.ts
index cc0cddf36b..b9665ff39a 100644
--- a/libs/remix-debug/src/solidity-decoder/internalCallTree.ts
+++ b/libs/remix-debug/src/solidity-decoder/internalCallTree.ts
@@ -5,7 +5,7 @@ import { SourceLocationTracker } from '../source/sourceLocationTracker'
 import { EventManager } from '../eventManager'
 import { parseType } from './decodeInfo'
 import { isContractCreation, isCallInstruction, isCreateInstruction, isJumpDestInstruction } from '../trace/traceHelper'
-import { extractLocationFromAstVariable } from './types/util.js'
+import { extractLocationFromAstVariable } from './types/util'
 
 /**
  * Tree representing internal jump into function.
diff --git a/libs/remix-debug/test.ts b/libs/remix-debug/test.ts
index e1749a27d9..c3e47b1769 100644
--- a/libs/remix-debug/test.ts
+++ b/libs/remix-debug/test.ts
@@ -1,5 +1,5 @@
 // TODO: this file shoudl be removed at some point
-var CmdLine = require('./src/cmdline/index.js')
+var CmdLine = require('./src/cmdline/index')
 // var compilation = require('./compilation.json')
 
 var solc = require('solc')
@@ -35,10 +35,10 @@ console.log('compiling...')
 let compilationData = JSON.parse(solc.compileStandardWrapper(JSON.stringify(inputJson)))
 console.dir(Object.keys(compilationData))
 var compilation = {}
-compilation.data = compilationData
-compilation.source = { sources: inputJson.sources }
+compilation['data'] = compilationData
+compilation['source'] = { sources: inputJson.sources }
 console.dir(compilation)
-console.dir(compilation.data.errors)
+console.dir(compilation['data'].errors)
 
 var cmdLine = new CmdLine()
 cmdLine.connect('http', 'http://localhost:8545')
diff --git a/libs/remix-debug/test/codeManager.ts b/libs/remix-debug/test/codeManager.ts
index d8683f28a4..b85875f5d3 100644
--- a/libs/remix-debug/test/codeManager.ts
+++ b/libs/remix-debug/test/codeManager.ts
@@ -1,8 +1,8 @@
 'use strict'
 import tape from 'tape'
-const TraceManager = require('../src/trace/traceManager')
-const CodeManager = require('../src/code/codeManager')
-const web3Test = require('./resources/testWeb3')
+import { TraceManager } from '../src/trace/traceManager'
+import { CodeManager } from '../src/code/codeManager'
+const web3Test = require('./resources/testWeb3.ts')
 
 tape('CodeManager', function (t) {
   const traceManager = new TraceManager({web3: web3Test})
diff --git a/libs/remix-debug/test/debugger.ts b/libs/remix-debug/test/debugger.ts
index 2af844b2c5..684d9a01fd 100644
--- a/libs/remix-debug/test/debugger.ts
+++ b/libs/remix-debug/test/debugger.ts
@@ -1,12 +1,13 @@
 import tape from 'tape'
-var deepequal = require('deep-equal')
-var remixLib = require('@remix-project/remix-lib')
-var compilerInput = require('./helpers/compilerHelper').compilerInput
-var SourceMappingDecoder = require('../src/source/sourceMappingDecoder')
+import deepequal from 'deep-equal'
+import { compilerInput } from './helpers/compilerHelper'
+import * as sourceMappingDecoder from '../src/source/sourceMappingDecoder'
+import { Ethdebugger as Debugger } from '../src/Ethdebugger'
+import { BreakpointManager } from '../src/code/breakpointManager'
 
-var vmCall = require('./vmCall')
-var Debugger = require('../src/Ethdebugger')
 var compiler = require('solc')
+var vmCall = require('./vmCall')
+var remixLib = require('@remix-project/remix-lib')
 
 var ballot = `pragma solidity >=0.4.22 <0.8.0;
 
@@ -149,8 +150,6 @@ contract Ballot {
 }
 `
 
-var BreakpointManager = require('../src/code/breakpointManager')
-
 var privateKey = Buffer.from('dae9801649ba2d95a21e688b56f77905e5667c44ce868ec83f82e838712a2c7a', 'hex')
 var vm = vmCall.initVM(privateKey)
 var output = compiler.compile(compilerInput(ballot))
@@ -273,7 +272,6 @@ function testDebugging (debugManager) {
 
   tape('breakPointManager', (t) => {
     t.plan(2)
-    var sourceMappingDecoder = new SourceMappingDecoder()
     const {traceManager, callTree, solidityProxy} = debugManager
     var breakPointManager = new BreakpointManager({traceManager, callTree, solidityProxy, locationToRowConverter: async (rawLocation) => {
       return sourceMappingDecoder.convertOffsetToLineColumn(rawLocation, sourceMappingDecoder.getLinebreakPositions(ballot))
diff --git a/libs/remix-debug/test/decoder/storageDecoder.ts b/libs/remix-debug/test/decoder/storageDecoder.ts
index 8b8a8faac1..82cb0bcf4f 100644
--- a/libs/remix-debug/test/decoder/storageDecoder.ts
+++ b/libs/remix-debug/test/decoder/storageDecoder.ts
@@ -2,8 +2,8 @@
 import tape from 'tape'
 var compiler = require('solc')
 var stateDecoder = require('../../src/solidity-decoder/stateDecoder')
-var MockStorageResolver = require('./mockStorageResolver')
-var compilerInput = require('../helpers/compilerHelper').compilerInput
+import { MockStorageResolver } from './mockStorageResolver'
+import { compilerInput } from '../helpers/compilerHelper'
 var testMappingStorage = require('./stateTests/mapping')
 
 tape('solidity', function (t) {
diff --git a/libs/remix-debug/test/sourceLocationTracker.ts b/libs/remix-debug/test/sourceLocationTracker.ts
index dbffb10afb..989f6ae336 100644
--- a/libs/remix-debug/test/sourceLocationTracker.ts
+++ b/libs/remix-debug/test/sourceLocationTracker.ts
@@ -1,12 +1,12 @@
 'use strict'
 import tape from 'tape'
-const TraceManager = require('../src/trace/traceManager')
-const CodeManager = require('../src/code/codeManager')
-const web3Test = require('./resources/testWeb3')
+import { TraceManager } from '../src/trace/traceManager'
+import { CodeManager } from '../src/code/codeManager'
+const web3Test = require('./resources/testWeb3.ts')
 const sourceMapping = require('./resources/sourceMapping')
-const SourceLocationTracker = require('../src/source/sourceLocationTracker')
+import { SourceLocationTracker } from '../src/source/sourceLocationTracker'
 const compiler = require('solc')
-const compilerInput = require('./helpers/compilerHelper').compilerInput
+import { compilerInput } from './helpers/compilerHelper'
 
 tape('SourceLocationTracker', function (t) {
   t.test('SourceLocationTracker.getSourceLocationFromVMTraceIndex - simple contract', async function (st) {
@@ -27,8 +27,8 @@ tape('SourceLocationTracker', function (t) {
       
       try {
         const map = await sourceLocationTracker.getSourceLocationFromVMTraceIndex('0x0d3a18d64dfe4f927832ab58d6451cecc4e517c5', 0, output.contracts)
-        st.equal(map.file, 0)
-        st.equal(map.start, 0)
+        st.equal(map['file'], 0)
+        st.equal(map['start'], 0)
       } catch (e) {
         console.log(e)
       }
@@ -59,21 +59,21 @@ tape('SourceLocationTracker', function (t) {
       try {
         let map = await sourceLocationTracker.getSourceLocationFromVMTraceIndex('0x0d3a18d64dfe4f927832ab58d6451cecc4e517c5', 0, output.contracts)
         console.log(map)
-        st.equal(map.file, 0)
-        st.equal(map.start, 35)
+        st.equal(map['file'], 0)
+        st.equal(map['start'], 35)
 
         map = await sourceLocationTracker.getSourceLocationFromVMTraceIndex('0x0d3a18d64dfe4f927832ab58d6451cecc4e517c5', 45, output.contracts)
-        st.equal(map.file, 1) // 1 refers to the generated source (pragma experimental ABIEncoderV2)
+        st.equal(map['file'], 1) // 1 refers to the generated source (pragma experimental ABIEncoderV2)
 
         map = await sourceLocationTracker.getValidSourceLocationFromVMTraceIndex('0x0d3a18d64dfe4f927832ab58d6451cecc4e517c5', 45, output.contracts)
-        st.equal(map.file, 1) // 1 refers to the generated source (pragma experimental ABIEncoderV2)
-        st.equal(map.start, 1293)
-        st.equal(map.length, 32)
+        st.equal(map['file'], 1) // 1 refers to the generated source (pragma experimental ABIEncoderV2)
+        st.equal(map['start'], 1293)
+        st.equal(map['length'], 32)
 
         map = await sourceLocationTracker.getValidSourceLocationFromVMTraceIndex('0x0d3a18d64dfe4f927832ab58d6451cecc4e517c5', 36, output.contracts)
-        st.equal(map.file, 0) // 0 refers to the initial solidity code. see source below (ABIEncoderV2)
-        st.equal(map.start, 303)
-        st.equal(map.length, 448)
+        st.equal(map['file'], 0) // 0 refers to the initial solidity code. see source below (ABIEncoderV2)
+        st.equal(map['start'], 303)
+        st.equal(map['length'], 448)
       } catch (e) {
         console.log(e)
       }
diff --git a/libs/remix-debug/test/sourceMappingDecoder.ts b/libs/remix-debug/test/sourceMappingDecoder.ts
index 4371c635cf..106d1b2074 100644
--- a/libs/remix-debug/test/sourceMappingDecoder.ts
+++ b/libs/remix-debug/test/sourceMappingDecoder.ts
@@ -1,7 +1,7 @@
 'use strict'
 const tape = require('tape')
 const sourceMapping = require('./resources/sourceMapping')
-const SourceMappingDecoder = require('../src/source/sourceMappingDecoder')
+import * as sourceMappingDecoder from '../src/source/sourceMappingDecoder'
 const compiler = require('solc')
 const compilerInput = require('./helpers/compilerHelper').compilerInput
 
@@ -9,7 +9,7 @@ tape('SourceMappingDecoder', function (t) {
   t.test('SourceMappingDecoder.findNodeAtInstructionIndex', function (st) {
     let output = compiler.compile(compilerInput(contracts))
     output = JSON.parse(output)
-    const sourceMappingDecoder = new SourceMappingDecoder()
+    // const sourceMappingDecoder = new SourceMappingDecoder()
     let node = sourceMappingDecoder.findNodeAtInstructionIndex('FunctionDefinition', 2, output.contracts['test.sol']['test'].evm.deployedBytecode.sourceMap, output.sources['test.sol'])
     st.equal(node, null)
     node = sourceMappingDecoder.findNodeAtInstructionIndex('FunctionDefinition', 80, output.contracts['test.sol']['test'].evm.deployedBytecode.sourceMap, output.sources['test.sol'])
@@ -23,7 +23,7 @@ tape('SourceMappingDecoder', function (t) {
   const testSourceMapping = {}
   t.test('sourceMappingDecoder', function (st) {
     st.plan(36)
-    const sourceMappingDecoder = new SourceMappingDecoder()
+    // const sourceMappingDecoder = new SourceMappingDecoder()
     console.log('test decompressAll')
     let result = sourceMappingDecoder.decompressAll(sourceMapping.mapping)
     st.equal(result[0].start, 0)
@@ -50,50 +50,49 @@ tape('SourceMappingDecoder', function (t) {
     testSourceMapping['last'] = result[last]
 
     console.log('test decompress')
-    result = sourceMappingDecoder.atIndex(22, sourceMapping.mapping)
-    console.log(result)
-    st.equal(result.start, 55)
-    st.equal(result.length, 74)
-    st.equal(result.file, 4)
-    st.equal(result.jump, '-')
-    testSourceMapping[22] = result
+    const result2 = sourceMappingDecoder.atIndex(22, sourceMapping.mapping)
+    // console.log(result2)
+    st.equal(result2['start'], 55)
+    st.equal(result2['length'], 74)
+    st.equal(result2['file'], 4)
+    st.equal(result2['jump'], '-')
+    testSourceMapping[22] = result2
 
-    result = sourceMappingDecoder.atIndex(82, sourceMapping.mapping)
-    console.log(result)
-    st.equal(result.start, 103)
-    st.equal(result.length, 2)
-    st.equal(result.file, 4)
-    st.equal(result.jump, '-')
-    testSourceMapping[82] = result
+    const result3 = sourceMappingDecoder.atIndex(82, sourceMapping.mapping)
+    // console.log(result)
+    st.equal(result3['start'], 103)
+    st.equal(result3['length'], 2)
+    st.equal(result['file'], 4)
+    st.equal(result['jump'], '-')
+    testSourceMapping[82] = result3
 
-    result = sourceMappingDecoder.atIndex(85, sourceMapping.mapping)
-    console.log(result)
-    st.equal(result.start, 99)
-    st.equal(result.length, 6)
-    st.equal(result.file, 4)
-    st.equal(result.jump, '-')
-    testSourceMapping[85] = result
+    const result4 = sourceMappingDecoder.atIndex(85, sourceMapping.mapping)
+    // console.log(result)
+    st.equal(result4['start'], 99)
+    st.equal(result4['length'], 6)
+    st.equal(result4['file'], 4)
+    st.equal(result4['jump'], '-')
+    testSourceMapping[85] = result4
 
     // ballot - function deletegate(address)
     const delegateSrcMap = sourceMappingDecoder.atIndex(64, sourceMapping.ballotSourceMap)
     console.log(delegateSrcMap)
-    st.equal(delegateSrcMap.start, 712)
-    st.equal(delegateSrcMap.length, 577)
-    st.equal(delegateSrcMap.file, 0)
-    st.equal(delegateSrcMap.jump, '-')
+    st.equal(delegateSrcMap['start'], 712)
+    st.equal(delegateSrcMap['length'], 577)
+    st.equal(delegateSrcMap['file'], 0)
+    st.equal(delegateSrcMap['jump'], '-')
 
     // TokenSaleChallenge - function test(uint256)
     const tokenSaleChallengeMap = sourceMappingDecoder.atIndex(170, sourceMapping.tokenSaleChallengeSourceMap)
     console.log(tokenSaleChallengeMap)
-    st.equal(tokenSaleChallengeMap.start, 45)
-    st.equal(tokenSaleChallengeMap.length, 16)
-    st.equal(tokenSaleChallengeMap.file, -1)
-    st.equal(tokenSaleChallengeMap.jump, '-')
+    st.equal(tokenSaleChallengeMap['start'], 45)
+    st.equal(tokenSaleChallengeMap['length'], 16)
+    st.equal(tokenSaleChallengeMap['file'], -1)
+    st.equal(tokenSaleChallengeMap['jump'], '-')
   })
 
   t.test('sourceMappingLineColumnConverter', function (st) {
     st.plan(14)
-    const sourceMappingDecoder = new SourceMappingDecoder()
     const linesbreak = sourceMappingDecoder.getLinebreakPositions(sourceMapping.source)
     st.equal(linesbreak[0], 16)
     st.equal(linesbreak[5], 84)
diff --git a/libs/remix-debug/test/tests.ts b/libs/remix-debug/test/tests.ts
index 88f62dcc53..b105d02f12 100644
--- a/libs/remix-debug/test/tests.ts
+++ b/libs/remix-debug/test/tests.ts
@@ -9,4 +9,4 @@ require('./decoder/decodeInfo')
 require('./decoder/storageLocation')
 require('./decoder/storageDecoder')
 require('./decoder/localDecoder')
-require('./debugger.js')
+require('./debugger')
diff --git a/libs/remix-debug/test/traceManager.ts b/libs/remix-debug/test/traceManager.ts
index d1000a3bbf..3269bceb4a 100644
--- a/libs/remix-debug/test/traceManager.ts
+++ b/libs/remix-debug/test/traceManager.ts
@@ -1,7 +1,7 @@
 'use strict'
 import { TraceManager } from '../src/trace/traceManager'
 import tape from 'tape'
-const web3Test = require('./resources/testWeb3')
+const web3Test = require('./resources/testWeb3.ts')
 
 tape('TraceManager', function (t) {
   let traceManager