diff --git a/.buildkite/eslint_flow_jest.yml b/.buildkite/eslint_flow_jest.yml
--- a/.buildkite/eslint_flow_jest.yml
+++ b/.buildkite/eslint_flow_jest.yml
@@ -5,7 +5,7 @@
       - 'curl --proto "=https" --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y'
       - '. /root/.cargo/env'
       - 'yarn cleaninstall --frozen-lockfile --skip-optional --network-timeout 180000'
-      - 'yarn eslint --max-warnings=0 && yarn workspace lib flow && yarn workspace web flow && yarn workspace landing flow && yarn workspace native flow && yarn workspace keyserver flow'
+      - 'yarn eslint --max-warnings=0 && yarn workspace lib flow && yarn workspace web flow && yarn workspace landing flow && yarn workspace native flow && yarn workspace keyserver flow && yarn workspace desktop flow'
       - 'yarn workspace lib test && yarn workspace keyserver test'
     plugins:
       - docker#v3.13.0:
diff --git a/.github/workflows/eslint_flow_jest.yml b/.github/workflows/eslint_flow_jest.yml
--- a/.github/workflows/eslint_flow_jest.yml
+++ b/.github/workflows/eslint_flow_jest.yml
@@ -41,6 +41,10 @@
         working-directory: ./native
         run: ./node_modules/.bin/flow
 
+      - name: '[desktop] flow'
+        working-directory: ./desktop
+        run: ./node_modules/.bin/flow
+
       - name: '[lib] test'
         working-directory: ./lib
         run: yarn test
diff --git a/.lintstagedrc.js b/.lintstagedrc.js
--- a/.lintstagedrc.js
+++ b/.lintstagedrc.js
@@ -38,6 +38,9 @@
   '{landing,lib}/**/*.js': function landingFlow(files) {
     return 'yarn workspace landing flow --quiet';
   },
+  '{desktop,lib}/**/*.js': function desktopFlow(files) {
+    return 'yarn workspace desktop flow --quiet';
+  },
   'services/identity/**/*.rs': function testIdentity(files) {
     return 'bash -c "cd services/identity && cargo test"';
   },
diff --git a/desktop/.eslintrc.json b/desktop/.eslintrc.json
--- a/desktop/.eslintrc.json
+++ b/desktop/.eslintrc.json
@@ -1,6 +1,3 @@
 {
-  "rules": {
-    "flowtype/require-valid-file-annotation": "off"
-  },
   "env": { "node": true }
 }
diff --git a/desktop/.flowconfig b/desktop/.flowconfig
new file mode 100644
--- /dev/null
+++ b/desktop/.flowconfig
@@ -0,0 +1,29 @@
+[include]
+../lib
+
+[libs]
+../lib/flow-typed
+
+[options]
+exact_by_default=true
+
+format.bracket_spacing=false
+
+[lints]
+sketchy-null-number=warn
+sketchy-null-mixed=warn
+sketchy-number=warn
+untyped-type-import=warn
+nonstrict-import=warn
+deprecated-type=warn
+unsafe-getters-setters=warn
+unnecessary-invariant=warn
+
+[strict]
+deprecated-type
+nonstrict-import
+sketchy-null
+unclear-type
+unsafe-getters-setters
+untyped-import
+untyped-type-import
diff --git a/desktop/babel.config.cjs b/desktop/babel.config.cjs
--- a/desktop/babel.config.cjs
+++ b/desktop/babel.config.cjs
@@ -1,6 +1,7 @@
 module.exports = {
   presets: [
     ['@babel/preset-env', { targets: { electron: 22 }, modules: 'commonjs' }],
+    '@babel/preset-flow',
   ],
   plugins: [
     '@babel/plugin-proposal-class-properties',
diff --git a/desktop/flow-typed/npm/electron_vx.x.x.js b/desktop/flow-typed/npm/electron_vx.x.x.js
new file mode 100644
--- /dev/null
+++ b/desktop/flow-typed/npm/electron_vx.x.x.js
@@ -0,0 +1,19 @@
+// @flow
+// flow-typed signature: f8bfa3876f1890f644b65b1ebd801ed8
+// flow-typed version: <<STUB>>/electron_v22.0.0/flow_v0.182.0
+
+/**
+ * This is an autogenerated libdef stub for:
+ *
+ *   'electron'
+ *
+ * Fill this stub out by replacing all the `any` types.
+ *
+ * Once filled out, we encourage you to share your work with the
+ * community by sending a pull request to:
+ * https://github.com/flowtype/flow-typed
+ */
+
+declare module 'electron' {
+  declare module.exports: any;
+}
diff --git a/desktop/forge.config.cjs b/desktop/forge.config.cjs
--- a/desktop/forge.config.cjs
+++ b/desktop/forge.config.cjs
@@ -61,7 +61,13 @@
   packagerConfig: {
     name: 'Comm',
     icon: 'icons/icon',
-    ignore: ['src', '.*config\\.cjs', '\\.eslintrc\\.json'],
+    ignore: [
+      'src',
+      '.*config\\.cjs',
+      '\\.eslintrc\\.json',
+      '\\.flowconfig',
+      'flow-typed',
+    ],
     appBundleId: 'app.comm.macos',
     osxSign: { identity: 'Developer ID Application' },
     osxNotarize: {
diff --git a/desktop/package.json b/desktop/package.json
--- a/desktop/package.json
+++ b/desktop/package.json
@@ -34,6 +34,8 @@
     "@electron-forge/maker-squirrel": "^6.0.4",
     "@electron-forge/plugin-base": "^6.0.4",
     "electron": "^22.0.0",
+    "flow-bin": "^0.182.0",
+    "flow-typed": "^3.2.1",
     "fs-extra": "^10.1.0",
     "klaw": "^4.0.1"
   }
diff --git a/desktop/src/handle-squirrel-event.js b/desktop/src/handle-squirrel-event.js
--- a/desktop/src/handle-squirrel-event.js
+++ b/desktop/src/handle-squirrel-event.js
@@ -1,3 +1,5 @@
+// @flow
+
 import { spawn } from 'child_process';
 import { app } from 'electron';
 import path from 'path';
@@ -6,7 +8,7 @@
 // uninstalling and updating so we can for example create or delete shortcuts.
 // After handling some of these events the app will be closed. If this function
 // returns false, the app should start normally.
-export function handleSquirrelEvent() {
+export function handleSquirrelEvent(): boolean {
   if (process.argv.length === 1) {
     return false;
   }
diff --git a/desktop/src/main.js b/desktop/src/main.js
--- a/desktop/src/main.js
+++ b/desktop/src/main.js
@@ -1,3 +1,5 @@
+// @flow
+
 import {
   app,
   BrowserWindow,
diff --git a/desktop/src/preload.js b/desktop/src/preload.js
--- a/desktop/src/preload.js
+++ b/desktop/src/preload.js
@@ -1,3 +1,5 @@
+// @flow
+
 import { contextBridge, ipcRenderer } from 'electron';
 
 const bridge = {
diff --git a/native/.flowconfig b/native/.flowconfig
--- a/native/.flowconfig
+++ b/native/.flowconfig
@@ -14,6 +14,7 @@
 
 .*/comm/web/.*
 .*/comm/keyserver/.*
+.*/comm/desktop/.*
 
 .*/android/app/build/.*