chore: validate path to type definitions on CI

.circleci/config.yml

@@ -49,6 +49,7 @@ jobs:
             at: ~/project
         - run: |
             yarn lerna run prepare
+            node scripts/check-types-path.js
 
 workflows:
   version: 2

scripts/check-types-path.js

@@ -0,0 +1,31 @@
+#!/usr/bin/env node
+
+/* eslint-disable import/no-commonjs */
+
+const fs = require('fs');
+const path = require('path');
+
+const packages = path.join(__dirname, '..', 'packages');
+
+const invalid = [];
+
+fs.readdirSync(packages).forEach(name => {
+  const dir = path.join(packages, name);
+
+  if (fs.statSync(path.join(packages, name)).isDirectory()) {
+    const pak = JSON.parse(
+      fs.readFileSync(path.join(dir, 'package.json'), 'utf8')
+    );
+
+    if (pak.types && !fs.existsSync(path.join(dir, pak.types))) {
+      invalid.push(pak);
+    }
+  }
+});
+
+if (invalid.length) {
+  console.log(
+    'Found invalid path to type definitions in the following packages:\n',
+    invalid.map(p => `- ${p.name} (${p.types})`).join('\n')
+  );
+}