diff --git a/libs/remix-debug/src/code/breakpointManager.ts b/libs/remix-debug/src/code/breakpointManager.ts
index 159cbd482e..556b26ed1c 100644
--- a/libs/remix-debug/src/code/breakpointManager.ts
+++ b/libs/remix-debug/src/code/breakpointManager.ts
@@ -8,7 +8,16 @@ const helper = require('../trace/traceHelper')
   *
   * Trigger events: breakpointHit, breakpointAdded, breakpointRemoved
   */
-class BreakpointManager {
+export class BreakpointManager {
+
+  event
+  traceManager
+  callTree
+  solidityProxy
+  breakpoints
+  locationToRowConverter
+  previousLine
+
   /**
     * constructor
     *
@@ -189,5 +198,3 @@ class BreakpointManager {
     }
   }
 }
-
-module.exports = BreakpointManager
diff --git a/libs/remix-debug/src/code/codeManager.ts b/libs/remix-debug/src/code/codeManager.ts
index 56d9972bbf..77d9f3768d 100644
--- a/libs/remix-debug/src/code/codeManager.ts
+++ b/libs/remix-debug/src/code/codeManager.ts
@@ -12,141 +12,147 @@ const CodeResolver = require('./codeResolver')
    - resolvingStep: when CodeManager resolves code/selected instruction of a new step
 */
 
-function CodeManager (_traceManager) {
-  this.event = new EventManager()
-  this.isLoading = false
-  this.traceManager = _traceManager
-  this.codeResolver = new CodeResolver({getCode: async (address) => {
-    return new Promise((resolve, reject) => {
-      this.traceManager.web3.eth.getCode(address, (error, code) => {
-        if (error) {
-          return reject(error)
-        }
-        return resolve(code)
-      })
-    })
-  }})
-}
-
-/**
- * clear the cache
- *
- */
-CodeManager.prototype.clear = function () {
-  this.codeResolver.clear()
-}
+export class CodeManager {
 
-/**
- * resolve the code of the given @arg stepIndex and trigger appropriate event
- *
- * @param {String} stepIndex - vm trace step
- * @param {Object} tx - transaction (given by web3)
- */
-CodeManager.prototype.resolveStep = function (stepIndex, tx) {
-  if (stepIndex < 0) return
-  this.event.trigger('resolvingStep')
-  if (stepIndex === 0) {
-    return retrieveCodeAndTrigger(this, tx.to, stepIndex, tx)
+  event
+  isLoading: boolean
+  traceManager
+  codeResolver
+  
+  constructor(_traceManager) {
+    this.event = new EventManager()
+    this.isLoading = false
+    this.traceManager = _traceManager
+    this.codeResolver = new CodeResolver({getCode: async (address) => {
+      return new Promise((resolve, reject) => {
+        this.traceManager.web3.eth.getCode(address, (error, code) => {
+          if (error) {
+            return reject(error)
+          }
+          return resolve(code)
+        })
+      })
+    }})
   }
-  try {
-    const address = this.traceManager.getCurrentCalledAddressAt(stepIndex)
-    retrieveCodeAndTrigger(this, address, stepIndex, tx)
-  } catch (error) {
-    return console.log(error)
+
+  /**
+   * clear the cache
+   *
+   */
+  clear () {
+    this.codeResolver.clear()
   }
-}
 
-/**
- * Retrieve the code located at the given @arg address
- *
- * @param {String} address - address of the contract to get the code from
- * @param {Function} cb - callback function, return the bytecode
- */
-CodeManager.prototype.getCode = async function (address) {
-  if (!traceHelper.isContractCreation(address)) {
-    const code = await this.codeResolver.resolveCode(address)
-    return code
+  /**
+   * resolve the code of the given @arg stepIndex and trigger appropriate event
+   *
+   * @param {String} stepIndex - vm trace step
+   * @param {Object} tx - transaction (given by web3)
+   */
+  resolveStep (stepIndex, tx) {
+    if (stepIndex < 0) return
+    this.event.trigger('resolvingStep')
+    if (stepIndex === 0) {
+      return this.retrieveCodeAndTrigger(this, tx.to, stepIndex, tx)
+    }
+    try {
+      const address = this.traceManager.getCurrentCalledAddressAt(stepIndex)
+      this.retrieveCodeAndTrigger(this, address, stepIndex, tx)
+    } catch (error) {
+      return console.log(error)
+    }
   }
-  var codes = this.codeResolver.getExecutingCodeFromCache(address)
-  if (codes) {
+
+  /**
+   * Retrieve the code located at the given @arg address
+   *
+   * @param {String} address - address of the contract to get the code from
+   * @param {Function} cb - callback function, return the bytecode
+   */
+  async getCode (address) {
+    if (!traceHelper.isContractCreation(address)) {
+      const code = await this.codeResolver.resolveCode(address)
+      return code
+    }
+    var codes = this.codeResolver.getExecutingCodeFromCache(address)
+    if (codes) {
+      return codes
+    }
+    const hexCode = this.traceManager.getContractCreationCode(address)
+    codes = this.codeResolver.cacheExecutingCode(address, hexCode)
     return codes
   }
-  const hexCode = this.traceManager.getContractCreationCode(address)
-  codes = this.codeResolver.cacheExecutingCode(address, hexCode)
-  return codes
-}
 
-/**
- * Retrieve the called function for the current vm step for the given @arg address
- *
- * @param {String} stepIndex - vm trace step
- * @param {String} sourceMap - source map given byt the compilation result
- * @param {Object} ast - ast given by the compilation result
- * @return {Object} return the ast node of the function
- */
-CodeManager.prototype.getFunctionFromStep = function (stepIndex, sourceMap, ast) {
-  try {
-    const address = this.traceManager.getCurrentCalledAddressAt(stepIndex)
-    const pc = this.traceManager.getCurrentPC(stepIndex)
-    return this.getFunctionFromPC(address, pc, sourceMap, ast)
-  } catch (error) {
-    console.log(error)
-    return { error: 'Cannot retrieve current address or PC for ' + stepIndex }
+  /**
+   * Retrieve the called function for the current vm step for the given @arg address
+   *
+   * @param {String} stepIndex - vm trace step
+   * @param {String} sourceMap - source map given byt the compilation result
+   * @param {Object} ast - ast given by the compilation result
+   * @return {Object} return the ast node of the function
+   */
+  getFunctionFromStep (stepIndex, sourceMap, ast) {
+    try {
+      const address = this.traceManager.getCurrentCalledAddressAt(stepIndex)
+      const pc = this.traceManager.getCurrentPC(stepIndex)
+      return this.getFunctionFromPC(address, pc, sourceMap, ast)
+    } catch (error) {
+      console.log(error)
+      return { error: 'Cannot retrieve current address or PC for ' + stepIndex }
+    }
   }
-}
 
-/**
- * Retrieve the instruction index of the given @arg step
- *
- * @param {String} address - address of the current context
- * @param {String} step - vm trace step
- * @param {Function} callback - instruction index
- */
-CodeManager.prototype.getInstructionIndex = function (address, step) {
-  try {
-    const pc = this.traceManager.getCurrentPC(step)
-    const itemIndex = this.codeResolver.getInstructionIndex(address, pc)
-    return itemIndex
-  } catch (error) {
-    console.log(error)
-    throw new Error('Cannot retrieve current PC for ' + step)
+  /**
+   * Retrieve the instruction index of the given @arg step
+   *
+   * @param {String} address - address of the current context
+   * @param {String} step - vm trace step
+   * @param {Function} callback - instruction index
+   */
+  getInstructionIndex (address, step) {
+    try {
+      const pc = this.traceManager.getCurrentPC(step)
+      const itemIndex = this.codeResolver.getInstructionIndex(address, pc)
+      return itemIndex
+    } catch (error) {
+      console.log(error)
+      throw new Error('Cannot retrieve current PC for ' + step)
+    }
   }
-}
 
-/**
- * Retrieve the called function for the given @arg pc and @arg address
- *
- * @param {String} address - address of the current context (used to resolve instruction index)
- * @param {String} pc - pc that point to the instruction index
- * @param {String} sourceMap - source map given byt the compilation result
- * @param {Object} ast - ast given by the compilation result
- * @return {Object} return the ast node of the function
- */
-CodeManager.prototype.getFunctionFromPC = function (address, pc, sourceMap, ast) {
-  const instIndex = this.codeResolver.getInstructionIndex(address, pc)
-  return SourceMappingDecoder.findNodeAtInstructionIndex('FunctionDefinition', instIndex, sourceMap, ast)
-}
+  /**
+   * Retrieve the called function for the given @arg pc and @arg address
+   *
+   * @param {String} address - address of the current context (used to resolve instruction index)
+   * @param {String} pc - pc that point to the instruction index
+   * @param {String} sourceMap - source map given byt the compilation result
+   * @param {Object} ast - ast given by the compilation result
+   * @return {Object} return the ast node of the function
+   */
+  getFunctionFromPC (address, pc, sourceMap, ast) {
+    const instIndex = this.codeResolver.getInstructionIndex(address, pc)
+    return SourceMappingDecoder.findNodeAtInstructionIndex('FunctionDefinition', instIndex, sourceMap, ast)
+  }
 
-function retrieveCodeAndTrigger (codeMananger, address, stepIndex, tx) {
-  codeMananger.getCode(address).then((result) => {
-    retrieveIndexAndTrigger(codeMananger, address, stepIndex, result.instructions)
-  }).catch((error) => {
-    return console.log(error)
-  })
-}
+  private retrieveCodeAndTrigger (codeMananger, address, stepIndex, tx) {
+    codeMananger.getCode(address).then((result) => {
+      this.retrieveIndexAndTrigger(codeMananger, address, stepIndex, result.instructions)
+    }).catch((error) => {
+      return console.log(error)
+    })
+  }
 
-function retrieveIndexAndTrigger (codeMananger, address, step, code) {
-  let result
-  try {
-    result = codeMananger.getInstructionIndex(address, step)
-  } catch (error) {
-    return console.log(error)
+  private retrieveIndexAndTrigger (codeMananger, address, step, code) {
+    let result
+    try {
+      result = codeMananger.getInstructionIndex(address, step)
+    } catch (error) {
+      return console.log(error)
+    }
+    try {
+      codeMananger.event.trigger('changed', [code, address, result])
+    } catch (e) {
+      console.log('dispatching event failed', e)
+    }  
   }
-  try {
-    codeMananger.event.trigger('changed', [code, address, result])
-  } catch (e) {
-    console.log('dispatching event failed', e)
-  }  
 }
-
-module.exports = CodeManager