Revert babel/babel-eslint#584 (babel/babel-eslint#697)

* Revert "Treat type alias declarationlike function declaration (babel/babel-eslint#584)"

This reverts commit 020d012c554913fea137f4129798ce31a4896dfe.

Author: hzoo

eslint/babel-eslint-parser/lib/babylon-to-espree/toAST.js

@@ -72,15 +72,6 @@ var astTransformVisitor = {
       delete node.bound;
     }
 
-    if (path.isTypeAlias()) {
-      node.type = "FunctionDeclaration";
-      node.generator = false;
-      node.async = false;
-      node.expression = false;
-      node.params = [];
-      node.body = node.right;
-    }
-
     // flow: prevent "no-undef"
     // for "Component" in: "let x: React.Component"
     if (path.isQualifiedTypeIdentifier()) {

eslint/babel-eslint-parser/test/non-regression.js

@@ -1091,18 +1091,6 @@ describe("verify", () => {
         { "no-unused-vars": 1, "no-undef": 1 }
       );
     });
-
-    it("cyclic type dependencies should not error #485", () => {
-      verifyAndAssertMessages(
-        unpad(`
-          type Node<T> = { head: T, tail: Node<T> };
-          type A = B[];
-          type B = number;
-        `),
-        { "no-use-before-define": 0 },
-        []
-      );
-    });
   });
 
   it("class usage", () => {