diff --git a/Procfile b/Procfile
new file mode 100644
index 0000000000..ca9e686335
--- /dev/null
+++ b/Procfile
@@ -0,0 +1 @@
+web: node api/build/app.js
\ No newline at end of file
diff --git a/api/Procfile b/api/Procfile
deleted file mode 100644
index f1cd405cc0..0000000000
--- a/api/Procfile
+++ /dev/null
@@ -1 +0,0 @@
-web: node src/app.js
\ No newline at end of file
diff --git a/api/package.json b/api/package.json
index c3cc4805fd..56628a60b4 100644
--- a/api/package.json
+++ b/api/package.json
@@ -65,8 +65,9 @@
   },
   "scripts": {
     "readme": "node misc/readmeData.js | mustache - misc/README.mustache > README.md",
-    "start": "node src/app.ts",
-    "dev": "nodemon src/app.ts"
+    "start": "node build/app.ts",
+    "dev": "nodemon src/app.ts",
+    "build": "rm -rf build && tsc"
   },
   "publishConfig": {
     "access": "public"
diff --git a/api/src/api.yml b/api/src/api.yml
deleted file mode 100644
index 955d51e4a8..0000000000
--- a/api/src/api.yml
+++ /dev/null
@@ -1,128 +0,0 @@
-swagger: "2.0"
-info:
-  title: nivo
-  version: 1.0.0
-  description: nivo API
-host: localhost:3000
-basePath: /
-schemes:
-  - http
-paths:
-  /charts/line:
-    post:
-      operationId: lineChart
-      parameters:
-        - name:     props
-          in:       body
-          required: true
-          schema:
-            type:       object
-            required:
-              - width
-              - height
-              - keys
-              - identity
-            properties:
-              width:
-                type: integer
-              height:
-                type: integer
-              keys:
-                type:  array
-                items:
-                  type: string
-              identity:
-                type: string
-      responses:
-        200:
-          description: line chart
-
-  /charts/bar:
-    post:
-      operationId: barChart
-      parameters:
-        - name:     props
-          in:       body
-          required: true
-          schema:
-            type:       object
-            required:
-              - width
-              - height
-              - keys
-              - identity
-            properties:
-              width:
-                type: integer
-              height:
-                type: integer
-              keys:
-                type:  array
-                items:
-                  type: string
-              identity:
-                type: string
-      responses:
-        200:
-          description: bar chart
-
-  /charts/bubble:
-    post:
-      operationId: bubbleChart
-      parameters:
-        - name:     props
-          in:       body
-          required: true
-          schema:
-            type:       object
-            required:
-              - width
-              - height
-            properties:
-              width:
-                type: integer
-              height:
-                type: integer
-      responses:
-        200:
-          description: bubble chart
-
-  /charts/chord:
-    post:
-      operationId: chordChart
-      parameters:
-        - name:     props
-          in:       body
-          required: true
-          schema:
-            type:       object
-            required:
-              - width
-              - height
-              - data
-            properties:
-              width:
-                type: integer
-              height:
-                type: integer
-              data:
-                type: string
-              padAngle:
-                type: number
-              innerRadiusRatio:
-                type: number
-              innerRadiusOffset:
-                type: number
-              ribbonOpacity:
-                type: number
-              ribbonBorderWidth:
-                type: integer
-              arcOpacity:
-                type: number
-              arcBorderWidth:
-                type: integer
-              colors:
-                type: string
-      responses:
-        200:
-          description: chord diagram
\ No newline at end of file
diff --git a/api/src/app.ts b/api/src/app.ts
index b11a1f62e0..6b00ffc750 100644
--- a/api/src/app.ts
+++ b/api/src/app.ts
@@ -1,4 +1,3 @@
-import path from 'path'
 import express from 'express'
 import { forOwn } from 'lodash'
 import * as uuid from 'uuid'
@@ -30,10 +29,6 @@ app.use(
 )
 app.use(compression())
 
-app.get('/', (req, res) => {
-    res.sendFile(path.resolve(__dirname, 'api.yml'))
-})
-
 app.get('/status', (req, res) => {
     res.status(200).json({
         status: 'ok',
diff --git a/api/tsconfig.json b/api/tsconfig.json
index 86a6d37fef..afecb8b9d7 100644
--- a/api/tsconfig.json
+++ b/api/tsconfig.json
@@ -1,8 +1,11 @@
 {
   "compilerOptions": {
     "module": "commonjs",
-    "target": "es6",
-    "rootDir": "./",
-    "esModuleInterop": true
+    "target": "es5",
+    "rootDir": "./src",
+    "outDir": "build",
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true
   }
 }
\ No newline at end of file
diff --git a/package.json b/package.json
index 4d74d1e837..64218a92a1 100644
--- a/package.json
+++ b/package.json
@@ -89,7 +89,9 @@
     "make:init": "make init",
     "prepublishOnly": "yarn release:prepare",
     "release:prepare": "node scripts/bump-peer-deps.js && yarn changelog",
-    "version": "yarn release:prepare"
+    "version": "yarn release:prepare",
+    "build": "echo 'nothing to do, please use make for available commands'",
+    "heroku-postbuild": "make packages-build && cd api && yarn build"
   },
   "workspaces": [
     "packages/*",
diff --git a/packages/tooltip/src/BasicTooltip.tsx b/packages/tooltip/src/BasicTooltip.tsx
index f457980dec..8ed46085a8 100644
--- a/packages/tooltip/src/BasicTooltip.tsx
+++ b/packages/tooltip/src/BasicTooltip.tsx
@@ -2,7 +2,7 @@ import { memo, ReactNode } from 'react'
 import { useTheme, ValueFormat, useValueFormatter } from '@nivo/core'
 import { Chip } from './Chip'
 
-interface BasicTooltipProps {
+export interface BasicTooltipProps {
     id: ReactNode
     value?: number | string | Date
     format?: ValueFormat<number | string | Date>