diff --git a/lib/index.js b/lib/index.js
index c6e7350..2bb3883 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -27,17 +27,18 @@ const createRule = (name, browserstring, description, {fixable = null, schema =
       return {}
     }
   }
-  if (ts) {
-    const configName = `typescript-${ts}`
+    const configName = `typescript-${ts || 'base'}`
     if (!module.exports.configs[configName]) {
+      let config = {rules: {}}
       if (ts === 2016) {
-        module.exports.configs[configName] = {extends: [`escompat:recommended`], rules: {}}
-      } else {
-        module.exports.configs[configName] = {extends: [`escompat:typescript-${ts-1}`], rules: {}}
+        config.extends = [`escompat:typescript-base`]
+      } else if (ts) {
+        config.extends = [`escompat:typescript-${ts-1}`]
       }
+      module.exports.configs[configName] = config
     }
-    module.exports.configs[configName].rules[`escompat/${name}`] = 'off'
-  }
+    module.exports.configs[`typescript-base`].rules[`escompat/${name}`] = 'off'
+    module.exports.configs[configName].rules[`escompat/${name}`] = 'error'
 }
 
 module.exports = { rules: {}, configs: {} }