diff --git a/.eslintrc.js b/.eslintrc.js
index 8a60988..afc6b85 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -40,6 +40,12 @@ module.exports = {
     'prettier/prettier': ['error', { endOfLine: 'auto', semi: false }],
     'import/prefer-default-export': 'off',
     'no-restricted-syntax': ['off', 'ForOfStatement'],
+    'lines-between-class-members': [
+      'error',
+      'always',
+      { exceptAfterSingleLine: true },
+    ],
+    'no-use-before-define': 'off',
 
     '@typescript-eslint/explicit-module-boundary-types': 'off',
 
@@ -55,4 +61,12 @@ module.exports = {
       },
     ],
   },
+  overrides: [
+    {
+      files: ['**/tests/**/*.js', '**/tests/**/*.ts'], // Adjust the pattern to match your test files
+      rules: {
+        'import/extensions': 'off', // Turn off the rule for test files
+      },
+    },
+  ],
 }
diff --git a/jest.config.js b/jest.config.js
index 0492673..9e953ad 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -2,6 +2,8 @@
 // const { jsWithTs: tsjPreset } = require('ts-jest/presets')
 
 module.exports = {
-  preset: 'ts-jest/presets/js-with-ts',
-  testEnvironment: 'node',
+  preset: 'ts-jest/presets/default-esm',
+  moduleNameMapper: {
+    '^(\\.{1,2}/.*)\\.js$': '$1', // Redirect .js imports to .ts files
+  },
 }
diff --git a/package.json b/package.json
index 81e089b..0631702 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
     "cli": "yarn workspace client start",
     "lint": "eslint .",
     "format": "prettier --ignore-path .prettierignore --write app server",
-    "test": "yarn jest",
+    "test": "yarn node --experimental-vm-modules --no-warnings $(yarn bin jest)",
     "test:e2e": "yarn workspace tests test",
     "test:open": "yarn workspace tests test:open",
     "analytics": "yarn workspace analytics dev",
@@ -29,7 +29,7 @@
     "build:quests": "yarn workspace server build:quests"
   },
   "devDependencies": {
-    "@types/jest": "^29.5.11",
+    "@types/jest": "^29.5.12",
     "@types/node": "^20.10.4",
     "@typescript-eslint/eslint-plugin": "^6.14.0",
     "@typescript-eslint/parser": "^6.14.0",
diff --git a/packages/constants/index.js b/packages/constants/index.ts
similarity index 100%
rename from packages/constants/index.js
rename to packages/constants/index.ts
diff --git a/packages/file-graph/src/file.ts b/packages/file-graph/src/file.ts
index 1656e41..5fb5126 100644
--- a/packages/file-graph/src/file.ts
+++ b/packages/file-graph/src/file.ts
@@ -1,7 +1,6 @@
-/* eslint-disable lines-between-class-members */
 import { basename } from './utils.js'
 
-interface FileObject {
+export interface FileObject {
   path: string
   type: string
   discovered: boolean
diff --git a/packages/file-graph/src/fileGraph.js b/packages/file-graph/src/fileGraph.ts
similarity index 82%
rename from packages/file-graph/src/fileGraph.js
rename to packages/file-graph/src/fileGraph.ts
index a2a924e..5d63b18 100644
--- a/packages/file-graph/src/fileGraph.js
+++ b/packages/file-graph/src/fileGraph.ts
@@ -1,7 +1,14 @@
+import { FileObject } from './file.js'
 import FileNode from './fileNode.js'
 
+export interface Event {
+  add?: FileObject[]
+  remove?: FileObject[]
+  discover?: FileObject[]
+}
+
 export default class FileGraph extends FileNode {
-  add(files) {
+  add(files: FileObject[]) {
     // Logic to add the file node to the graph
     // You can implement the logic to find the appropriate location in the file graph
     // If the file node already exists, throw an error
@@ -11,7 +18,7 @@ export default class FileGraph extends FileNode {
     })
   }
 
-  remove(files) {
+  remove(files: FileObject[]) {
     // Logic to remove a file node from the graph
     // If the file node is a folder, also remove all children
     // If the file node doesn't exist, throw an error
@@ -21,7 +28,7 @@ export default class FileGraph extends FileNode {
     })
   }
 
-  discover(eventFiles) {
+  discover(eventFiles: FileObject[]) {
     // Logic to handle the discover event
     // Overwrite the file graph with the provided files
     // Remove file nodes that don't exist anymore and add new ones
@@ -35,7 +42,7 @@ export default class FileGraph extends FileNode {
     this.merge(newNode)
   }
 
-  handleEvent(event) {
+  handleEvent(event: Event) {
     // eslint-disable-next-line default-case
     switch (true) {
       case !!event.add:
diff --git a/packages/file-graph/src/fileNode.js b/packages/file-graph/src/fileNode.ts
similarity index 85%
rename from packages/file-graph/src/fileNode.js
rename to packages/file-graph/src/fileNode.ts
index cf8f089..7c64fe1 100644
--- a/packages/file-graph/src/fileNode.js
+++ b/packages/file-graph/src/fileNode.ts
@@ -1,19 +1,25 @@
-import File from './file.js'
+import File, { FileObject } from './file.js'
 import {
   DuplicateItemError,
   ParentNotExistsError,
   FileNotExistsError,
 } from './errors.js'
-import { basename, dirname } from './utils.js'
+import { dirname } from './utils.js'
 
 export default class FileNode extends File {
-  constructor(file) {
+  children: FileNode[]
+
+  constructor(file: FileObject | FileNode) {
     super(file)
     this.children = []
-    if (file.children) this.children = file.children.map((f) => new FileNode(f))
+    if ((<FileNode>file).children)
+      this.children = (<FileNode>file).children.map((f) => new FileNode(f))
   }
 
-  addChild(fileInput, { makeParents } = {}) {
+  addChild(
+    fileInput: FileObject,
+    { makeParents }: { makeParents?: boolean } = {}
+  ) {
     const file = new FileNode(fileInput)
     if (file.path === this.path) {
       throw new DuplicateItemError(
@@ -39,7 +45,6 @@ export default class FileNode extends File {
       } else if (makeParents) {
         const parent = new FileNode({
           path: parentPath,
-          name: basename(parentPath),
           type: 'folder',
           discovered: false,
           children: [file],
@@ -53,7 +58,7 @@ export default class FileNode extends File {
     }
   }
 
-  removeChild(fileToRemove) {
+  removeChild(fileToRemove: FileObject) {
     const file = new FileNode(fileToRemove)
     const parentPath = dirname(file.path)
 
@@ -73,7 +78,7 @@ export default class FileNode extends File {
     }
   }
 
-  merge(fileNode) {
+  merge(fileNode: FileNode) {
     // Merge the children of the provided file node into this node
     // If a child already exists, merge the children of that child
     // If a child does not exist, add it to this node
@@ -88,7 +93,7 @@ export default class FileNode extends File {
         if (existingChild) {
           existingChild.merge(child)
         } else {
-          this.children.push(child)
+          this.children.push(new FileNode(child))
         }
       })
 
@@ -112,14 +117,12 @@ export default class FileNode extends File {
       }
     } else {
       throw new Error(
-        'Cannot merge file nodes with different paths',
-        this.path,
-        fileNode.path
+        `Cannot merge file nodes with different paths: ${this.path}, ${fileNode.path}`
       )
     }
   }
 
-  toString(level = 0) {
+  toString(level = 0): string {
     let { name } = this
     const indent = '    '.repeat(level)
     name = `${indent}${name}`
diff --git a/packages/file-graph/src/index.js b/packages/file-graph/src/index.js
deleted file mode 100644
index 4b1fcda..0000000
--- a/packages/file-graph/src/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-export { default as File } from './file.js'
-export { default as FileNode } from './fileNode.js'
-export { default as FileGraph } from './fileGraph.js'
diff --git a/packages/file-graph/src/index.ts b/packages/file-graph/src/index.ts
new file mode 100644
index 0000000..f9dc793
--- /dev/null
+++ b/packages/file-graph/src/index.ts
@@ -0,0 +1,3 @@
+export { default as File, FileObject } from './file.js'
+export { default as FileNode } from './fileNode.js'
+export { default as FileGraph, Event } from './fileGraph.js'
diff --git a/packages/file-graph/src/utils.js b/packages/file-graph/src/utils.ts
similarity index 57%
rename from packages/file-graph/src/utils.js
rename to packages/file-graph/src/utils.ts
index 48fffd9..5a637e4 100644
--- a/packages/file-graph/src/utils.js
+++ b/packages/file-graph/src/utils.ts
@@ -1,4 +1,4 @@
-export function dirname(path) {
+export function dirname(path: string) {
   const parts = path.split('/')
   if (parts.length <= 2) {
     return '/'
@@ -7,7 +7,7 @@ export function dirname(path) {
   return parts.join('/')
 }
 
-export function basename(path) {
+export function basename(path: string): string {
   const parts = path.split('/')
-  return parts.pop()
+  return parts.pop() ?? ''
 }
diff --git a/packages/models/src/command.js b/packages/models/src/command.ts
similarity index 100%
rename from packages/models/src/command.js
rename to packages/models/src/command.ts
diff --git a/packages/models/src/commandResponder.js b/packages/models/src/commandResponder.ts
similarity index 100%
rename from packages/models/src/commandResponder.js
rename to packages/models/src/commandResponder.ts
diff --git a/packages/models/src/condition.js b/packages/models/src/condition.ts
similarity index 100%
rename from packages/models/src/condition.js
rename to packages/models/src/condition.ts
diff --git a/packages/models/src/exception.js b/packages/models/src/exception.ts
similarity index 100%
rename from packages/models/src/exception.js
rename to packages/models/src/exception.ts
diff --git a/packages/models/src/globalException.js b/packages/models/src/globalException.ts
similarity index 100%
rename from packages/models/src/globalException.js
rename to packages/models/src/globalException.ts
diff --git a/packages/models/src/hint.js b/packages/models/src/hint.ts
similarity index 100%
rename from packages/models/src/hint.js
rename to packages/models/src/hint.ts
diff --git a/packages/models/src/index.js b/packages/models/src/index.ts
similarity index 67%
rename from packages/models/src/index.js
rename to packages/models/src/index.ts
index c3b835c..d69ae25 100644
--- a/packages/models/src/index.js
+++ b/packages/models/src/index.ts
@@ -6,10 +6,7 @@ export { default as Session } from './session.js'
 export { default as Command } from './command.js'
 export { default as UserProfile } from './userProfile.js'
 
-export default async function connectDB(uri) {
-  const db = await mongoose.connect(uri, {
-    useNewUrlParser: true,
-    useUnifiedTopology: true,
-  })
+export default async function connectDB(uri: string) {
+  const db = await mongoose.connect(uri)
   return db.connection.getClient()
 }
diff --git a/packages/models/src/quest.js b/packages/models/src/quest.ts
similarity index 100%
rename from packages/models/src/quest.js
rename to packages/models/src/quest.ts
diff --git a/packages/models/src/requirement.js b/packages/models/src/requirement.ts
similarity index 100%
rename from packages/models/src/requirement.js
rename to packages/models/src/requirement.ts
diff --git a/packages/models/src/response.js b/packages/models/src/response.ts
similarity index 100%
rename from packages/models/src/response.js
rename to packages/models/src/response.ts
diff --git a/packages/models/src/session.js b/packages/models/src/session.ts
similarity index 100%
rename from packages/models/src/session.js
rename to packages/models/src/session.ts
diff --git a/packages/models/src/stage.js b/packages/models/src/stage.ts
similarity index 100%
rename from packages/models/src/stage.js
rename to packages/models/src/stage.ts
diff --git a/packages/models/src/stageException.js b/packages/models/src/stageException.ts
similarity index 100%
rename from packages/models/src/stageException.js
rename to packages/models/src/stageException.ts
diff --git a/packages/models/src/user.js b/packages/models/src/user.ts
similarity index 100%
rename from packages/models/src/user.js
rename to packages/models/src/user.ts
diff --git a/packages/models/src/userProfile.js b/packages/models/src/userProfile.ts
similarity index 100%
rename from packages/models/src/userProfile.js
rename to packages/models/src/userProfile.ts
diff --git a/packages/utils/src/auth.js b/packages/utils/src/auth.ts
similarity index 87%
rename from packages/utils/src/auth.js
rename to packages/utils/src/auth.ts
index 59caef6..b3170e1 100644
--- a/packages/utils/src/auth.js
+++ b/packages/utils/src/auth.ts
@@ -1,4 +1,4 @@
-export function isValidUsername(username) {
+export function isValidUsername(username: string): boolean {
   // check if the username is between 1 and 32 characters
   if (username.length > 32) {
     return false
@@ -29,7 +29,7 @@ export function isValidUsername(username) {
   return true
 }
 
-export function isValidEmail(email) {
+export function isValidEmail(email: string): boolean {
   // Define a regular expression pattern for a valid email address.
   const emailPattern = /^[\w-.+]+@([\w][\w-]*\.)+[\w-]{2,}$/
 
diff --git a/packages/utils/src/commands.js b/packages/utils/src/commands.ts
similarity index 50%
rename from packages/utils/src/commands.js
rename to packages/utils/src/commands.ts
index c64a33a..b40ea2e 100644
--- a/packages/utils/src/commands.js
+++ b/packages/utils/src/commands.ts
@@ -3,14 +3,21 @@ const fileTypes = {
   folder: '-d',
   link: '-L',
   socket: '-S',
+  unknown: '-e',
 }
 
-function sanitizePath(path) {
+export type FileType = keyof typeof fileTypes
+
+export type File = {
+  path: string
+  type: FileType
+}
+
+function sanitizePath(path: string): string {
   return path.replace(/[^a-zA-Z0-9._/-]/g, '')
 }
 
-// eslint-disable-next-line import/prefer-default-export
-export function buildFileCheckCmd(file) {
+export function buildFileCheckCmd(file: File): string[] {
   const { path, type } = file
   return ['test', fileTypes[type] || '-e', sanitizePath(path)]
 }
diff --git a/packages/utils/src/dag.js b/packages/utils/src/dag.js
deleted file mode 100644
index 6a3a911..0000000
--- a/packages/utils/src/dag.js
+++ /dev/null
@@ -1,73 +0,0 @@
-export default class DAG {
-  #nodes = new Map()
-
-  #edges = new Set()
-
-  #layers = []
-
-  constructor(nodes) {
-    this.#nodes = new Map(nodes.map((node) => [node._id, node]))
-    this.#edges = new Set()
-    this.#nodes.forEach((_, id) => {
-      this.#setLayer(id)
-      this.#addEdges(id)
-    })
-  }
-
-  getNode(id) {
-    return this.#nodes.get(id)
-  }
-
-  getNodes() {
-    return Array.from(this.#nodes.values())
-  }
-
-  getEdges() {
-    return this.#edges
-  }
-
-  getEdgesArray() {
-    return Array.from(this.#edges.values())
-  }
-
-  getLayers() {
-    return this.#layers
-  }
-
-  getLayer(id) {
-    const node = this.getNode(id)
-    if (!node) {
-      throw new Error(`Node ${id} not found`)
-    }
-    return this.#layers[node.layer - 1]
-  }
-
-  #setLayer(id) {
-    const node = this.getNode(id)
-    if (!node) {
-      throw new Error(`Node ${id} not found`)
-    }
-    if (node.layer !== undefined) {
-      return node.layer
-    }
-    const previousLayer = node.requirements.map((rId) => this.#setLayer(rId))
-    node.layer = Math.max(...previousLayer, 0) + 1
-    if (this.#layers.length < node.layer) {
-      this.#layers.push(1)
-    } else {
-      this.#layers[node.layer - 1] += 1
-    }
-    node.index = this.#layers[node.layer - 1]
-    return node.layer
-  }
-
-  #addEdges(id) {
-    const node = this.getNode(id)
-    if (!node) {
-      throw new Error(`Node ${id} not found`)
-    }
-    node.requirements.forEach((rId) => {
-      this.#edges.add([rId, id])
-    })
-  }
-}
diff --git a/packages/utils/src/dag.ts b/packages/utils/src/dag.ts
new file mode 100644
index 0000000..b5ef439
--- /dev/null
+++ b/packages/utils/src/dag.ts
@@ -0,0 +1,78 @@
+interface Node {
+  _id: string
+  requirements: string[]
+}
+
+export default class DAG {
+  private nodes = new Map()
+  private edges = new Set()
+  private layers: number[] = []
+
+  constructor(nodes: Node[]) {
+    this.nodes = new Map(nodes.map((node) => [node._id, node]))
+    this.edges = new Set()
+    this.nodes.forEach((_, id) => {
+      this.setLayer(id)
+      this.addEdges(id)
+    })
+  }
+
+  getNode(id: string) {
+    return this.nodes.get(id)
+  }
+
+  getNodes() {
+    return Array.from(this.nodes.values())
+  }
+
+  getEdges() {
+    return this.edges
+  }
+
+  getEdgesArray() {
+    return Array.from(this.edges.values())
+  }
+
+  getLayers() {
+    return this.layers
+  }
+
+  getLayer(id: string) {
+    const node = this.getNode(id)
+    if (!node) {
+      throw new Error(`Node ${id} not found`)
+    }
+    return this.layers[node.layer - 1]
+  }
+
+  private setLayer(id: string) {
+    const node = this.getNode(id)
+    if (!node) {
+      throw new Error(`Node ${id} not found`)
+    }
+    if (node.layer !== undefined) {
+      return node.layer
+    }
+    const previousLayer = node.requirements.map((rId: string) =>
+      this.setLayer(rId)
+    )
+    node.layer = Math.max(...previousLayer, 0) + 1
+    if (this.layers.length < node.layer) {
+      this.layers.push(1)
+    } else {
+      this.layers[node.layer - 1] += 1
+    }
+    node.index = this.layers[node.layer - 1]
+    return node.layer
+  }
+
+  addEdges(id: string) {
+    const node = this.getNode(id)
+    if (!node) {
+      throw new Error(`Node ${id} not found`)
+    }
+    node.requirements.forEach((rId: string) => {
+      this.edges.add([rId, id])
+    })
+  }
+}
diff --git a/packages/utils/src/index.js b/packages/utils/src/index.ts
similarity index 100%
rename from packages/utils/src/index.js
rename to packages/utils/src/index.ts
diff --git a/packages/utils/tests/commands.test.ts b/packages/utils/tests/commands.test.ts
index 9ac76ff..e1888ca 100644
--- a/packages/utils/tests/commands.test.ts
+++ b/packages/utils/tests/commands.test.ts
@@ -1,8 +1,11 @@
-import { buildFileCheckCmd } from '../src/commands'
+import { buildFileCheckCmd, File } from '../src/commands'
 
 describe('buildFileCheckCmd function', () => {
   it('builds the file check command correctly', () => {
-    const testcases = [
+    const testcases: {
+      input: File
+      output: string[]
+    }[] = [
       {
         input: { path: '/etc/passwd', type: 'file' },
         output: ['test', '-f', '/etc/passwd'],
diff --git a/packages/utils/tsconfig.json b/packages/utils/tsconfig.json
index bf649ac..8f50229 100644
--- a/packages/utils/tsconfig.json
+++ b/packages/utils/tsconfig.json
@@ -2,7 +2,8 @@
   "extends": "../../tsconfig.json",
   "compilerOptions": {
     "rootDir": "src",
-    "outDir": "./dist"
+    "outDir": "./dist",
+    "allowJs": false
   },
   "include": ["src"],
   "exclude": ["node_modules", "dist"]
diff --git a/server/src/models/sessionManager.js b/server/src/models/sessionManager.js
index 03c79a4..80fb01e 100644
--- a/server/src/models/sessionManager.js
+++ b/server/src/models/sessionManager.js
@@ -14,9 +14,9 @@ async function deactivateSessions(user, quest) {
       return deleteContainer(session.containerId)
         .catch((err) => logger.error('Failed to delete container', err))
         .finally(() => {
-          session.status = 'inactive'
-          session.containerId = null
-          return session.save()
+          return Session.findByIdAndUpdate(session._id, {
+            $set: { status: 'inactive', containerId: null },
+          }).catch((err) => logger.error('Failed to update session', err))
         })
     })
   )
diff --git a/tsconfig.json b/tsconfig.json
index 3695271..3deb233 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -8,6 +8,8 @@
     "forceConsistentCasingInFileNames": true,
     "strict": true,
     "skipLibCheck": true,
-    "outDir": "dist"
+    "outDir": "dist",
+    "sourceMap": true,
+    "declaration": true
   }
 }
diff --git a/yarn.lock b/yarn.lock
index b3ddac4..03133b8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1460,7 +1460,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/jest@npm:^29.5.11":
+"@types/jest@npm:^29.5.12":
   version: 29.5.12
   resolution: "@types/jest@npm:29.5.12"
   dependencies:
@@ -6512,7 +6512,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "linux-odyssey@workspace:."
   dependencies:
-    "@types/jest": "npm:^29.5.11"
+    "@types/jest": "npm:^29.5.12"
     "@types/node": "npm:^20.10.4"
     "@typescript-eslint/eslint-plugin": "npm:^6.14.0"
     "@typescript-eslint/parser": "npm:^6.14.0"