diff --git a/package.json b/package.json
index 7dd967df5..4ed5c7b5a 100644
--- a/package.json
+++ b/package.json
@@ -50,6 +50,7 @@
     "@types/lru-cache": "^5.1.0",
     "@types/micro": "^7.3.3",
     "@types/mongodb": "^3.3.10",
+    "@types/prettier": "^1.19.0",
     "@types/restify": "^8.4.1",
     "@types/shortid": "^0.0.29",
     "@types/update-notifier": "^2.5.0",
diff --git a/packages/bottender/src/cli/providers/sh/dev.ts b/packages/bottender/src/cli/providers/sh/dev.ts
index 0e6d5b999..cc83d30bd 100644
--- a/packages/bottender/src/cli/providers/sh/dev.ts
+++ b/packages/bottender/src/cli/providers/sh/dev.ts
@@ -1,3 +1,6 @@
+import fs from 'fs';
+import path from 'path';
+
 import ngrok from 'ngrok';
 import nodemon from 'nodemon';
 
@@ -23,9 +26,18 @@ const dev = async (ctx: CliContext): Promise<void> => {
 
   const { channels } = config;
 
+  const isTypescript = fs.statSync(path.resolve('tsconfig.json')).isFile;
+
   // watch
   nodemon(
-    `--exec "bottender start ${isConsole ? '--console' : ''} --port ${port}"`
+    [
+      isTypescript ? '--ext js,mjs,json,ts --ignore dist/ ' : '',
+      '--exec "',
+      isTypescript ? 'tsc && ' : '',
+      'bottender start',
+      isConsole ? ' --console' : '',
+      ` --port ${port}"`,
+    ].join('')
   )
     // TODO: improve messages
     .on('start', () => {
diff --git a/packages/create-bottender-app/.eslintignore b/packages/create-bottender-app/.eslintignore
new file mode 100644
index 000000000..34940079d
--- /dev/null
+++ b/packages/create-bottender-app/.eslintignore
@@ -0,0 +1 @@
+*.test.{ts,js}
diff --git a/packages/create-bottender-app/package.json b/packages/create-bottender-app/package.json
index cf12a4f16..46c4a2c67 100644
--- a/packages/create-bottender-app/package.json
+++ b/packages/create-bottender-app/package.json
@@ -18,6 +18,7 @@
     "figures": "^3.0.0",
     "fs-extra": "^8.1.0",
     "inquirer": "^7.0.0",
+    "prettier": "^1.19.1",
     "validate-npm-package-name": "^3.0.0"
   }
 }
diff --git a/packages/create-bottender-app/src/index.ts b/packages/create-bottender-app/src/index.ts
index 460f9997b..b9c53e430 100644
--- a/packages/create-bottender-app/src/index.ts
+++ b/packages/create-bottender-app/src/index.ts
@@ -9,6 +9,7 @@ import inquirer from 'inquirer';
 import spawn from 'cross-spawn';
 import validateProjectName from 'validate-npm-package-name';
 
+import generateAppEntry from './utils/generateAppEntry';
 import generateConfig from './utils/generateConfig';
 import { Answer, Platform, Session } from './types';
 import { bold, error, print } from './shared/log';
@@ -264,7 +265,11 @@ const run = async (
       ),
       root
     );
-
+    const appEntry = generateAppEntry(useTypescript, platforms);
+    fs.writeFileSync(
+      path.join(root, 'src', useTypescript ? 'index.ts' : 'index.js'),
+      appEntry
+    );
     fs.copySync(path.join(root, '.env.example'), path.join(root, '.env'));
     fs.copySync(path.join(root, 'gitignore'), path.join(root, '.gitignore'));
     fs.removeSync(path.join(root, 'gitignore'));
@@ -280,10 +285,12 @@ const run = async (
     print('');
 
     const knownGeneratedFiles = [
+      'bottender.config.js',
       'package.json',
       'npm-debug.log',
       'yarn-error.log',
       'yarn-debug.log',
+      'yarn.lock',
       'node_modules',
     ];
     const currentFiles = fs.readdirSync(path.join(root));
@@ -333,14 +340,9 @@ const createBot = async (
     private: true,
     scripts: {
       dev: 'bottender dev',
-      lint: 'eslint .',
-      start: 'bottender start',
+      lint: `eslint . ${useTypescript ? '--ext=js,ts' : ''}`,
+      start: `${useTypescript ? 'tsc && ' : ''}bottender start`,
       test: 'jest',
-      ...(useTypescript
-        ? {
-            build: 'tsc',
-          }
-        : {}),
     },
   };
 
diff --git a/packages/create-bottender-app/src/utils/generateAppEntry.ts b/packages/create-bottender-app/src/utils/generateAppEntry.ts
new file mode 100644
index 000000000..7db61aa9f
--- /dev/null
+++ b/packages/create-bottender-app/src/utils/generateAppEntry.ts
@@ -0,0 +1,46 @@
+import prettier from 'prettier';
+
+import { Platform } from '../types';
+
+const generateAppEntry = (
+  isTypescript: boolean,
+  platforms: Platform[]
+): string => {
+  if (!isTypescript) {
+    return prettier.format(
+      `
+module.exports = async function App(context) {
+  await context.sendText('Welcome to Bottender');
+};
+`,
+      {
+        trailingComma: 'es5',
+        singleQuote: true,
+        parser: 'babel',
+      }
+    );
+  }
+
+  const contexts = platforms.map(
+    platform => `${platform.charAt(0).toUpperCase()}${platform.slice(1)}Context`
+  );
+
+  return prettier.format(
+    `
+import { ${contexts.join(', ')} } from 'bottender';
+
+export default async function App(context: ${contexts.join(
+      ' | '
+    )}): Promise<void> {
+  await context.sendText('Welcome to Bottender');
+};
+`,
+    {
+      trailingComma: 'es5',
+      singleQuote: true,
+      parser: 'typescript',
+    }
+  );
+};
+
+export default generateAppEntry;
diff --git a/packages/create-bottender-app/src/utils/generateConfig.ts b/packages/create-bottender-app/src/utils/generateConfig.ts
index 601edb9d4..2127d55ef 100644
--- a/packages/create-bottender-app/src/utils/generateConfig.ts
+++ b/packages/create-bottender-app/src/utils/generateConfig.ts
@@ -1,9 +1,10 @@
+import prettier from 'prettier';
+
 import { Platform, Session } from '../types';
 
-const generateConfig = (
-  session: Session,
-  platforms: Platform[]
-): string => `module.exports = {
+const generateConfig = (session: Session, platforms: Platform[]): string =>
+  prettier.format(
+    `module.exports = {
   session: {
     driver: '${session}',
     stores: {
@@ -63,6 +64,12 @@ const generateConfig = (
     },
   },
 };
-`;
+`,
+    {
+      trailingComma: 'es5',
+      singleQuote: true,
+      parser: 'babel',
+    }
+  );
 
 export default generateConfig;
diff --git a/packages/create-bottender-app/template-typescript/src/index.ts b/packages/create-bottender-app/template-typescript/src/index.ts
deleted file mode 100644
index ff66a4fdb..000000000
--- a/packages/create-bottender-app/template-typescript/src/index.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export default async function App(context: any): Promise<void> {
-  await context.sendText('Welcome to Bottender');
-}
diff --git a/packages/create-bottender-app/template/src/index.js b/packages/create-bottender-app/template/src/index.js
deleted file mode 100644
index 9ff55a867..000000000
--- a/packages/create-bottender-app/template/src/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-module.exports = async function App(context) {
-  await context.sendText('Welcome to Bottender');
-};
diff --git a/yarn.lock b/yarn.lock
index b4363b5da..1b9ff9b0a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1647,6 +1647,11 @@
   resolved "https://registry.yarnpkg.com/@types/p-queue/-/p-queue-2.3.2.tgz#16bc5fece69ef85efaf2bce8b13f3ebe39c5a1c8"
   integrity sha512-eKAv5Ql6k78dh3ULCsSBxX6bFNuGjTmof5Q/T6PiECDq0Yf8IIn46jCyp3RJvCi8owaEmm3DZH1PEImjBMd/vQ==
 
+"@types/prettier@^1.19.0":
+  version "1.19.0"
+  resolved "https://registry.yarnpkg.com/@types/prettier/-/prettier-1.19.0.tgz#a2502fb7ce9b6626fdbfc2e2a496f472de1bdd05"
+  integrity sha512-gDE8JJEygpay7IjA/u3JiIURvwZW08f0cZSZLAzFoX/ZmeqvS0Sqv+97aKuHpNsalAMMhwPe+iAS6fQbfmbt7A==
+
 "@types/range-parser@*":
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/@types/range-parser/-/range-parser-1.2.3.tgz#7ee330ba7caafb98090bece86a5ee44115904c2c"
@@ -2564,9 +2569,9 @@ body-parser@1.19.0, body-parser@^1.19.0:
     type-is "~1.6.17"
 
 "bottender@file:packages/bottender":
-  version "1.2.0-alpha.4"
+  version "1.2.0"
   dependencies:
-    "@bottender/express" "file:../../../Library/Caches/Yarn/v4/npm-bottender-1.2.0-alpha.4-10dad676-e608-46ef-b748-ac2b653a576e-1578631392477/node_modules/bottender-express"
+    "@bottender/express" "file:../../../Library/Caches/Yarn/v6/npm-bottender-1.2.0-acf426fb-4401-4201-9696-d4b0bae7adb6-1581571697417/node_modules/bottender-express"
     "@hapi/joi" "^15.1.1"
     "@slack/rtm-api" "^5.0.3"
     arg "^4.1.1"