From d6d3c822785fd7dd2e5dd270cbb244847b1dbee5 Mon Sep 17 00:00:00 2001
From: Achim Weimert <achim.weimert@gmail.com>
Date: Fri, 14 Sep 2018 10:55:34 +0100
Subject: [PATCH 1/3] Improve typings for legacy elements

https://github.com/Polymer/polymer/issues/5350
---
 interfaces.d.ts | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/interfaces.d.ts b/interfaces.d.ts
index 9ff30e0ac7..4fdbeb40b1 100644
--- a/interfaces.d.ts
+++ b/interfaces.d.ts
@@ -26,9 +26,21 @@ export interface PolymerInit {
   extends?: string;
   properties?: PolymerElementProperties;
   observers?: string[];
-  template?: HTMLTemplateElement|string;
+  _template?: HTMLTemplateElement;
   hostAttributes?: {[key: string]: any};
   listeners?: {[key: string]: string};
+  behaviors?: PolymerInit | PolymerInit[];
+
+  // Lifecycle methods
+  registered?(): void;
+  created?(): void;
+  attached?(): void;
+  detached?(): void;
+  ready?(): void;
+  attributeChanged?(name: string, old?: string, value?: string);
+
+  // Allow any other user-defined properties
+  [others: string]: any;
 }
 
 // Types from "externs/polymer-internal-shared-types.js"

From bf02bd32da30de21549cea82bcde62d1aeecd57b Mon Sep 17 00:00:00 2001
From: Achim Weimert <achim.weimert@gmail.com>
Date: Fri, 14 Sep 2018 11:17:30 +0100
Subject: [PATCH 2/3] Add specific type for behaviors

---
 interfaces.d.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/interfaces.d.ts b/interfaces.d.ts
index 4fdbeb40b1..41579bdb33 100644
--- a/interfaces.d.ts
+++ b/interfaces.d.ts
@@ -29,7 +29,7 @@ export interface PolymerInit {
   _template?: HTMLTemplateElement;
   hostAttributes?: {[key: string]: any};
   listeners?: {[key: string]: string};
-  behaviors?: PolymerInit | PolymerInit[];
+  behaviors?: BehaviorInit | BehaviorInit[];
 
   // Lifecycle methods
   registered?(): void;
@@ -43,6 +43,11 @@ export interface PolymerInit {
   [others: string]: any;
 }
 
+export type BehaviorInit = Pick<
+  PolymerInit,
+  Exclude<keyof PolymerInit, "is" | "extends" | "_template">
+>;
+
 // Types from "externs/polymer-internal-shared-types.js"
 
 export interface StampedTemplate extends DocumentFragment {

From 239e99a59a8cecfc76342cac0780a5de63688d4d Mon Sep 17 00:00:00 2001
From: Achim Weimert <achim.weimert@gmail.com>
Date: Fri, 14 Sep 2018 13:34:33 +0100
Subject: [PATCH 3/3] Add missing return type to attributeChanged

---
 interfaces.d.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/interfaces.d.ts b/interfaces.d.ts
index 41579bdb33..79fb54cde4 100644
--- a/interfaces.d.ts
+++ b/interfaces.d.ts
@@ -37,7 +37,7 @@ export interface PolymerInit {
   attached?(): void;
   detached?(): void;
   ready?(): void;
-  attributeChanged?(name: string, old?: string, value?: string);
+  attributeChanged?(name: string, old?: string, value?: string): void;
 
   // Allow any other user-defined properties
   [others: string]: any;