diff --git a/src/collector/definitions.js b/src/collector/definitions.js
index dbcfc47..b16a014 100644
--- a/src/collector/definitions.js
+++ b/src/collector/definitions.js
@@ -31,6 +31,10 @@ import {invariant} from '../utils';
 
 function processTypeAlias(ctx: Context, node: TypeAlias | DeclareTypeAlias) {
     const {name} = node.id;
+
+    // Forward declaration for the recursive types
+    ctx.define(name, t.createAny());
+
     const type = makeType(ctx, node.right);
 
     // TODO: support function aliases.
diff --git a/src/collector/scope.js b/src/collector/scope.js
index 3aa6409..08bb432 100644
--- a/src/collector/scope.js
+++ b/src/collector/scope.js
@@ -84,7 +84,7 @@ export default class Scope {
 
         if (declared) {
             invariant(decl);
-            invariant(decl.kind === 'declaration');
+            invariant(decl.kind === 'declaration' || decl.kind === 'definition');
         } else {
             invariant(!decl);
         }