diff --git a/demo/nodejs/index.js b/demo/nodejs/index.js
index 8c2a4ff4c..130099f8d 100644
--- a/demo/nodejs/index.js
+++ b/demo/nodejs/index.js
@@ -10,7 +10,7 @@ engine.registerTag('header', {
     const [key, val] = token.args.split(':')
     this[key] = val
   },
-  render: async function (scope, hash, emitter) {
+  render: async function (scope, emitter) {
     const title = await this.liquid.evalValue(this.content, scope)
     emitter.write(`<h1>${title}</h1>`)
   }
diff --git a/demo/reactjs/package.json b/demo/reactjs/package.json
index 3b9075e06..fc1e63a02 100644
--- a/demo/reactjs/package.json
+++ b/demo/reactjs/package.json
@@ -21,5 +21,8 @@
     "not dead",
     "not ie <= 11",
     "not op_mini all"
-  ]
+  ],
+  "devDependencies": {
+    "@babel/core": "^7.8.7"
+  }
 }
diff --git a/demo/typescript/index.ts b/demo/typescript/index.ts
index ffb3bde3c..b496aef76 100644
--- a/demo/typescript/index.ts
+++ b/demo/typescript/index.ts
@@ -1,25 +1,25 @@
-import { Liquid, TagToken, Hash, Context, Emitter } from 'liquidjs'
-
-const engine = new Liquid({
-  root: __dirname,
-  extname: '.liquid'
-})
-
-engine.registerTag('header', {
-  parse: function (token: TagToken) {
-    const [key, val] = token.args.split(':')
-    this[key] = val
-  },
-  render: async function (context: Context, hash: Hash, emitter: Emitter) {
-    const title = await this.liquid.evalValue(this['content'], context)
-    emitter.write(`<h1>${title}</h1>`)
-  }
-})
-
-const ctx = {
-  todos: ['fork and clone', 'make it better', 'make a pull request'],
-  title: 'Welcome to liquidjs!'
-}
-
-// console.log('isTruthy:', isTruthy('a string here'));
-engine.renderFile('todolist', ctx).then(console.log)
+import { Liquid, TagToken, Context, Emitter } from 'liquidjs'
+
+const engine = new Liquid({
+  root: __dirname,
+  extname: '.liquid'
+})
+
+engine.registerTag('header', {
+  parse: function (token: TagToken) {
+    const [key, val] = token.args.split(':')
+    this[key] = val
+  },
+  render: async function (context: Context, emitter: Emitter) {
+    const title = await this.liquid.evalValue(this['content'], context)
+    emitter.write(`<h1>${title}</h1>`)
+  }
+})
+
+const ctx = {
+  todos: ['fork and clone', 'make it better', 'make a pull request'],
+  title: 'Welcome to liquidjs!'
+}
+
+// console.log('isTruthy:', isTruthy('a string here'));
+engine.renderFile('todolist', ctx).then(console.log)