diff --git a/package.json b/package.json
index 4f455f6e4..5b7324e76 100644
--- a/package.json
+++ b/package.json
@@ -73,6 +73,7 @@
     "@types/jest": "^25.1.0",
     "@types/lodash.debounce": "^4.0.6",
     "@types/lodash.isequal": "^4.5.5",
+    "@types/mkdirp": "^1.0.0",
     "@types/node": "^12.12.20",
     "@types/react": "^16.9.17",
     "@types/react-dom": "^16.9.4",
diff --git a/static/launcher.js b/static/launcher.ts
similarity index 79%
rename from static/launcher.js
rename to static/launcher.ts
index ac00e2b89..369f0d016 100644
--- a/static/launcher.js
+++ b/static/launcher.ts
@@ -7,13 +7,13 @@
  * @format
  */
 
-const os = require('os');
-const fs = require('fs');
-const path = require('path');
-const promisify = require('util').promisify;
-const {spawn} = require('child_process');
-const xdg = require('xdg-basedir');
-const mkdirp = require('mkdirp');
+import os from 'os';
+import fs from 'fs';
+import path from 'path';
+import {promisify} from 'util';
+import {spawn} from 'child_process';
+import xdg from 'xdg-basedir';
+import mkdirp from 'mkdirp';
 
 const isProduction = () =>
   !/node_modules[\\/]electron[\\/]/.test(process.execPath);
@@ -31,7 +31,7 @@ const isLauncherInstalled = () => {
   return false;
 };
 
-const startLauncher = argv => {
+const startLauncher = (argv: {file?: string; url?: string}) => {
   const args = [];
   if (argv.file) {
     args.push('--file', argv.file);
@@ -45,7 +45,7 @@ const startLauncher = argv => {
 };
 
 const checkIsCycle = async () => {
-  const dir = path.join(xdg.cache, 'flipper');
+  const dir = path.join(xdg.cache!, 'flipper');
   const filePath = path.join(dir, 'last-launcher-run');
   // This isn't monotonically increasing, so there's a change we get time drift
   // between the checks, but the worst case here is that we do two roundtrips
@@ -54,7 +54,10 @@ const checkIsCycle = async () => {
 
   let backThen;
   try {
-    backThen = parseInt(await promisify(fs.readFile)(filePath), 10);
+    backThen = parseInt(
+      (await promisify(fs.readFile)(filePath)).toString(),
+      10,
+    );
   } catch (e) {
     backThen = 0;
   }
@@ -71,7 +74,11 @@ const checkIsCycle = async () => {
  * Runs the launcher if required and returns a boolean based on whether
  * it has. You should shut down this instance of the app in that case.
  */
-module.exports = async function delegateToLauncher(argv) {
+export default async function delegateToLauncher(argv: {
+  launcher: boolean;
+  file?: string;
+  url?: string;
+}) {
   if (argv.launcher && isProduction() && isLauncherInstalled()) {
     if (await checkIsCycle()) {
       console.error(
@@ -89,4 +96,4 @@ module.exports = async function delegateToLauncher(argv) {
   }
 
   return false;
-};
+}
diff --git a/static/main.ts b/static/main.ts
index cf493b8fa..b57ec5470 100644
--- a/static/main.ts
+++ b/static/main.ts
@@ -18,7 +18,7 @@ import fixPath from 'fix-path';
 import {exec} from 'child_process';
 const compilePlugins = require('./compilePlugins');
 import setup from './setup';
-const delegateToLauncher = require('./launcher');
+import delegateToLauncher from './launcher';
 import expandTilde from 'expand-tilde';
 import yargs from 'yargs';
 
diff --git a/yarn.lock b/yarn.lock
index 12db25a04..2f4419efd 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1423,6 +1423,13 @@
   dependencies:
     "@types/node" "*"
 
+"@types/mkdirp@^1.0.0":
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/@types/mkdirp/-/mkdirp-1.0.0.tgz#16ce0eabe4a9a3afe64557ad0ee6886ec3d32927"
+  integrity sha512-ONFY9//bCEr3DWKON3iDv/Q8LXnhaYYaNDeFSN0AtO5o4sLf9F0pstJKKKjQhXE0kJEeHs8eR6SAsROhhc2Csw==
+  dependencies:
+    "@types/node" "*"
+
 "@types/node-fetch@^2.5.4":
   version "2.5.4"
   resolved "https://registry.yarnpkg.com/@types/node-fetch/-/node-fetch-2.5.4.tgz#5245b6d8841fc3a6208b82291119bc11c4e0ce44"