diff --git a/.eslintrc.json b/.eslintrc.json
deleted file mode 100644
index 98d234d..0000000
--- a/.eslintrc.json
+++ /dev/null
@@ -1,26 +0,0 @@
-{
-  "extends": [
-    "plugin:github/es6",
-    "plugin:github/browser",
-    "plugin:github/flow"
-  ],
-  "overrides": [
-    {
-      "files": "test/**/*.js",
-      "rules": {
-        "flowtype/require-valid-file-annotation": "off"
-      }
-    },
-    {
-      "files": "test/**/*.js",
-      "excludedFiles": "test/karma.config.js",
-      "env": {
-        "mocha": true
-      },
-      "globals": {
-        "assert": true,
-        "sessionResume": true
-      }
-    }
-  ]
-}
diff --git a/.flowconfig b/.flowconfig
deleted file mode 100644
index 1fed445..0000000
--- a/.flowconfig
+++ /dev/null
@@ -1,11 +0,0 @@
-[ignore]
-
-[include]
-
-[libs]
-
-[lints]
-
-[options]
-
-[strict]
diff --git a/README.md b/README.md
index bb52541..10fe0f4 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Annotate fields to be persisted on navigation away from the current page.
 Fields be automatically restored when the user revists the page again in
 their current browser session (excludes separate tabs).
 
-Not design for persisted crash recovery.
+Not designed for persisted crash recovery.
 
 ## Installation
 
diff --git a/index.d.ts b/index.d.ts
deleted file mode 100644
index bbf1cc2..0000000
--- a/index.d.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export function setForm(event: Event): void;
-export function restoreResumableFields(id: string, options?: {keyPrefix?: string}): void;
-export function persistResumableFields(id: string, options?: {selector?: string, keyPrefix?: string}): void;
diff --git a/test/karma.config.js b/karma.config.js
similarity index 70%
rename from test/karma.config.js
rename to karma.config.js
index 643b0db..a73c650 100644
--- a/test/karma.config.js
+++ b/karma.config.js
@@ -1,7 +1,10 @@
 module.exports = function (config) {
   config.set({
     frameworks: ['mocha', 'chai'],
-    files: ['../dist/session-resume.umd.js', 'test.js'],
+    files: [
+      {pattern: 'dist/index.js', type: 'module'},
+      {pattern: 'test/test.js', type: 'module'}
+    ],
     reporters: ['mocha'],
     port: 9876,
     colors: true,
diff --git a/package-lock.json b/package-lock.json
index c901696..90011e4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,905 +13,69 @@
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       }
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-      "dev": true,
-      "requires": {
-        "browserslist": "^4.9.1",
-        "invariant": "^2.2.4",
-        "semver": "^5.5.0"
-      }
-    },
-    "@babel/core": {
-      "version": "7.9.0",
-      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.9.0.tgz",
-      "integrity": "sha512-kWc7L0fw1xwvI0zi8OKVBuxRVefwGOrKSQMvrQ3dW+bIIavBY3/NpXmpjMy7bQnLgwgzWQZ8TlM57YHpHNHz4w==",
-      "dev": true,
-      "requires": {
-        "@babel/code-frame": "^7.8.3",
-        "@babel/generator": "^7.9.0",
-        "@babel/helper-module-transforms": "^7.9.0",
-        "@babel/helpers": "^7.9.0",
-        "@babel/parser": "^7.9.0",
-        "@babel/template": "^7.8.6",
-        "@babel/traverse": "^7.9.0",
-        "@babel/types": "^7.9.0",
-        "convert-source-map": "^1.7.0",
-        "debug": "^4.1.0",
-        "gensync": "^1.0.0-beta.1",
-        "json5": "^2.1.2",
-        "lodash": "^4.17.13",
-        "resolve": "^1.3.2",
-        "semver": "^5.4.1",
-        "source-map": "^0.5.0"
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-      "integrity": "sha512-L4Qoh15vTfntsn4P1zqnHulG0LdXgjSO035fEpdtp6YxXhMT51Q6vgM5lYdG/5X3MjS+k/Y9Xw4SFCY9IkR0rg==",
-      "dev": true,
-      "requires": {
-        "unicode-canonical-property-names-ecmascript": "^1.0.4",
-        "unicode-property-aliases-ecmascript": "^1.0.4"
-      }
-    },
-    "unicode-match-property-value-ecmascript": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/unicode-match-property-value-ecmascript/-/unicode-match-property-value-ecmascript-1.2.0.tgz",
-      "integrity": "sha512-wjuQHGQVofmSJv1uVISKLE5zO2rNGzM/KCYZch/QQvez7C1hUhBIuZ701fYXExuufJFMPhv2SyL8CyoIfMLbIQ==",
-      "dev": true
-    },
-    "unicode-property-aliases-ecmascript": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/unicode-property-aliases-ecmascript/-/unicode-property-aliases-ecmascript-1.1.0.tgz",
-      "integrity": "sha512-PqSoPh/pWetQ2phoj5RLiaqIk4kCNwoV3CI+LfGmWLKI3rE3kl1h59XpX2BjgDrmbxD9ARtQobPGU1SguCYuQg==",
-      "dev": true
-    },
     "universalify": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
diff --git a/package.json b/package.json
index 0bb2786..74ae483 100644
--- a/package.json
+++ b/package.json
@@ -2,45 +2,46 @@
   "name": "@github/session-resume",
   "version": "0.0.8",
   "description": "Annotate fields to be persisted on navigation away from the current page.",
-  "main": "dist/session-resume.umd.js",
-  "module": "dist/session-resume.esm.js",
-  "types": "index.d.ts",
+  "main": "dist/umd/index.js",
+  "module": "dist/index.js",
+  "types": "dist/index.d.ts",
   "repository": "github/session-resume",
   "scripts": {
-    "build": "rollup -c && cp session-resume.js.flow dist/session-resume.esm.js.flow && cp session-resume.js.flow dist/session-resume.umd.js.flow",
-    "lint": "github-lint",
-    "test": "karma start test/karma.config.js",
     "clean": "rm -rf dist",
-    "prebuild": "npm run clean && npm run lint && mkdir dist",
+    "lint": "eslint src/*.ts test/*.js",
+    "prebuild": "npm run clean && npm run lint",
+    "build": "tsc && tsc -m umd --outDir dist/umd",
     "pretest": "npm run build",
+    "test": "karma start karma.config.js",
     "prepublishOnly": "npm run build",
     "postpublish": "npm publish --ignore-scripts --@github:registry='https://npm.pkg.github.com'"
   },
   "files": [
-    "dist",
-    "index.d.ts"
+    "dist"
   ],
   "keywords": [],
   "license": "MIT",
   "prettier": "@github/prettier-config",
+  "eslintConfig": {
+    "parser": "@typescript-eslint/parser",
+    "extends": [
+      "plugin:github/browser",
+      "plugin:github/es6",
+      "plugin:github/typescript"
+    ]
+  },
   "devDependencies": {
-    "@babel/core": "^7.9.0",
-    "@babel/plugin-proposal-class-properties": "^7.8.3",
-    "@babel/preset-env": "^7.9.5",
-    "@babel/preset-flow": "^7.9.0",
     "@github/prettier-config": "0.0.4",
     "chai": "^4.2.0",
     "eslint": "^6.8.0",
     "eslint-plugin-github": "^3.4.1",
-    "flow-bin": "^0.122.0",
     "karma": "^5.0.1",
     "karma-chai": "^0.1.0",
     "karma-chrome-launcher": "^3.1.0",
     "karma-mocha": "^1.3.0",
     "karma-mocha-reporter": "^2.2.5",
     "mocha": "^7.1.1",
-    "rollup": "^2.4.0",
-    "rollup-plugin-babel": "^4.4.0"
+    "typescript": "^3.8.3"
   },
   "dependencies": {},
   "eslintIgnore": [
diff --git a/rollup.config.js b/rollup.config.js
deleted file mode 100644
index 294db6e..0000000
--- a/rollup.config.js
+++ /dev/null
@@ -1,26 +0,0 @@
-/* @flow strict */
-
-import babel from 'rollup-plugin-babel'
-
-const pkg = require('./package.json')
-
-export default {
-  input: './session-resume.js',
-  output: [
-    {
-      file: pkg['module'],
-      format: 'es'
-    },
-    {
-      file: pkg['main'],
-      format: 'umd',
-      name: 'sessionResume'
-    }
-  ],
-  plugins: [
-    babel({
-      plugins: ['@babel/plugin-proposal-class-properties'],
-      presets: ['@babel/preset-env', '@babel/preset-flow']
-    })
-  ]
-}
diff --git a/session-resume.js.flow b/session-resume.js.flow
deleted file mode 100644
index 799c172..0000000
--- a/session-resume.js.flow
+++ /dev/null
@@ -1,7 +0,0 @@
-/* @flow strict */
-
-declare module.exports: {
-  setForm(event: Event): void;
-  restoreResumableFields(id: string, options?: {keyPrefix?: string}): void;
-  persistResumableFields(id: string, options?: {selector?: string, keyPrefix?: string}): void;
-};
diff --git a/session-resume.js b/src/index.ts
similarity index 70%
rename from session-resume.js
rename to src/index.ts
index a037257..601cdf7 100644
--- a/session-resume.js
+++ b/src/index.ts
@@ -1,28 +1,16 @@
-/* @flow strict */
-
-// Session Resume
-//
-// Annotate fields to be persisted on navigation away from the current page.
-// Fields be automatically restored when the user revists the page again in
-// their current browser session (excludes seperate tabs).
-//
-// Not design for persisted crash recovery.
-//
-
-// Last submitted HTMLFormElement that will cause a browser navigation
-let submittedForm = null
+// Last submitted HTMLFormElement that will cause a browser navigation.
+let submittedForm: HTMLFormElement | null = null
 
 function shouldResumeField(field: HTMLInputElement | HTMLTextAreaElement) {
   return field.id && field.value !== field.defaultValue && field.form !== submittedForm
 }
 
-type PersistOptions = {|selector: string, keyPrefix: string|}
+type PersistOptions = {selector?: string; keyPrefix?: string}
 
 // Write all ids and values of the selected fields on the page into sessionStorage.
-export function persistResumableFields(
-  id: string,
-  {selector = '.js-session-resumable', keyPrefix = 'session-resume:'}: PersistOptions = {}
-) {
+export function persistResumableFields(id: string, options?: PersistOptions) {
+  const selector = options?.selector ?? '.js-session-resumable'
+  const keyPrefix = options?.keyPrefix ?? 'session-resume:'
   const key = `${keyPrefix}${id}`
   const resumables = []
 
@@ -37,21 +25,22 @@ export function persistResumableFields(
   if (fields.length) {
     try {
       sessionStorage.setItem(key, JSON.stringify(fields))
-    } catch (error) {
+    } catch {
       // Ignore browser private mode error.
     }
   }
 }
 
-type RestoreOptions = {|keyPrefix: string|}
+type RestoreOptions = {keyPrefix?: string}
 
-export function restoreResumableFields(id: string, {keyPrefix = 'session-resume:'}: RestoreOptions = {}) {
+export function restoreResumableFields(id: string, options?: RestoreOptions) {
+  const keyPrefix = options?.keyPrefix ?? 'session-resume:'
   const key = `${keyPrefix}${id}`
   let fields
 
   try {
     fields = sessionStorage.getItem(key)
-  } catch (error) {
+  } catch {
     // Ignore browser private mode error.
   }
 
@@ -59,11 +48,11 @@ export function restoreResumableFields(id: string, {keyPrefix = 'session-resume:
 
   try {
     sessionStorage.removeItem(key)
-  } catch (error) {
+  } catch {
     // Ignore browser private mode error.
   }
 
-  const changedFields = []
+  const changedFields: Array<HTMLInputElement | HTMLTextAreaElement> = []
 
   for (const [fieldId, value] of JSON.parse(fields)) {
     const resumeEvent = new CustomEvent('session:resume', {
@@ -93,7 +82,7 @@ export function restoreResumableFields(id: string, {keyPrefix = 'session-resume:
 }
 
 export function setForm(event: Event) {
-  submittedForm = event.target
+  submittedForm = event.target as HTMLFormElement
 
   setTimeout(function () {
     if (event.defaultPrevented) {
diff --git a/test/.eslintrc.json b/test/.eslintrc.json
new file mode 100644
index 0000000..f89ccd1
--- /dev/null
+++ b/test/.eslintrc.json
@@ -0,0 +1,12 @@
+{
+  "parser": "espree",
+  "parserOptions": {
+    "ecmaVersion": 8
+  },
+  "env": {
+    "mocha": true
+  },
+  "globals": {
+    "assert": true
+  }
+}
diff --git a/test/test.js b/test/test.js
index d49d3cd..9e39ce8 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,3 +1,5 @@
+import {persistResumableFields, restoreResumableFields} from '../dist/index.js'
+
 describe('session-resume', function () {
   before(function () {
     document.body.innerHTML = `
@@ -12,7 +14,7 @@ describe('session-resume', function () {
   describe('restoreResumableFields', function () {
     it('restores fields values from session storage', function () {
       sessionStorage.setItem('session-resume:test-persist', JSON.stringify([['my-first-field', 'test2']]))
-      sessionResume.restoreResumableFields('test-persist')
+      restoreResumableFields('test-persist')
 
       assert.equal(document.querySelector('#my-first-field').value, 'test2')
       assert.equal(document.querySelector('#my-second-field').value, 'second-field-value')
@@ -25,7 +27,7 @@ describe('session-resume', function () {
       })
 
       sessionStorage.setItem('session-resume:test-persist', JSON.stringify([['my-first-field', 'test2']]))
-      sessionResume.restoreResumableFields('test-persist')
+      restoreResumableFields('test-persist')
 
       assert.deepEqual(fieldsRestored, {'my-first-field': 'test2'})
     })
@@ -38,7 +40,7 @@ describe('session-resume', function () {
       }
 
       sessionStorage.setItem('session-resume:test-persist', JSON.stringify([['my-first-field', 'test2']]))
-      sessionResume.restoreResumableFields('test-persist')
+      restoreResumableFields('test-persist')
     })
   })
 
@@ -46,7 +48,7 @@ describe('session-resume', function () {
     it('persist fields values to session storage', function () {
       document.querySelector('#my-first-field').value = 'test1'
       document.querySelector('#my-second-field').value = 'test2'
-      sessionResume.persistResumableFields('test-persist')
+      persistResumableFields('test-persist')
 
       assert.deepEqual(JSON.parse(sessionStorage.getItem('session-resume:test-persist')), [
         ['my-first-field', 'test1'],
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..3e0e3e4
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,13 @@
+{
+  "compilerOptions": {
+    "module": "es2015",
+    "target": "es2018",
+    "strict": true,
+    "declaration": true,
+    "outDir": "dist",
+    "removeComments": true
+  },
+  "files": [
+    "src/index.ts"
+  ]
+}