From 05c62f4442a58676689890fdd4d3d66282db9a6e Mon Sep 17 00:00:00 2001
From: Tim van der Lippe <tvanderlippe@gmail.com>
Date: Thu, 9 Aug 2018 15:10:35 +0200
Subject: [PATCH 1/3] Export the current Polymer version in polymer-element.js

---
 gulpfile.js        | 6 +++---
 polymer-element.js | 5 +++++
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/gulpfile.js b/gulpfile.js
index 8b584672f2..431ad920c8 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -277,7 +277,7 @@ gulp.task('lint', gulp.series('lint-eslint'));
 gulp.task('generate-types', gulp.series('generate-typescript'));
 
 gulp.task('update-version', () => {
-  return gulp.src('lib/utils/boot.js')
-  .pipe(replace(/(window.Polymer.version = )'\d+\.\d+\.\d+'/, `$1'${require('./package.json').version}'`))
-  .pipe(gulp.dest('lib/utils'));
+  return gulp.src('polymer-element.js')
+  .pipe(replace(/(export const version = )'\d+\.\d+\.\d+'/, `$1'${require('./package.json').version}'`))
+  .pipe(gulp.dest('.'));
 });
diff --git a/polymer-element.js b/polymer-element.js
index 7188e01b73..8cb6e5ccd2 100644
--- a/polymer-element.js
+++ b/polymer-element.js
@@ -28,3 +28,8 @@ export { html } from './lib/utils/html-tag.js';
  */
 export const PolymerElement = ElementMixin(HTMLElement);
 
+/**
+ * Current Polymer version in Semver notation.
+ * @type {String} Semver notation of the current version of Polymer.
+ */
+export const version = '3.0.5';

From 2957e9d4b8f2814feb0830e29567eb7c32b5fe34 Mon Sep 17 00:00:00 2001
From: Tim van der Lippe <tvanderlippe@gmail.com>
Date: Tue, 14 Aug 2018 12:44:33 +0200
Subject: [PATCH 2/3] Move version to ElementMixin prototype

---
 lib/mixins/element-mixin.js    | 14 ++++++++++++++
 polymer-element.js             |  7 +------
 test/unit/polymer.element.html |  3 +++
 3 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/lib/mixins/element-mixin.js b/lib/mixins/element-mixin.js
index 861d1b120f..77a140a8fd 100644
--- a/lib/mixins/element-mixin.js
+++ b/lib/mixins/element-mixin.js
@@ -17,6 +17,12 @@ import { DomModule } from '../elements/dom-module.js';
 import { PropertyEffects } from './property-effects.js';
 import { PropertiesMixin } from './properties-mixin.js';
 
+/**
+ * Current Polymer version in Semver notation.
+ * @type {string} Semver notation of the current version of Polymer.
+ */
+export const version = '3.0.5';
+
 /**
  * Element class mixin that provides the core API for Polymer's meta-programming
  * features including template stamping, data-binding, attribute deserialization,
@@ -278,6 +284,14 @@ export const ElementMixin = dedupingMixin(base => {
    */
   class PolymerElement extends polymerElementBase {
 
+    /**
+     * Current Polymer version in Semver notation.
+     * @type {string} Semver notation of the current version of Polymer.
+     */
+    static get polymerElementVersion() {
+      return version;
+    }
+
     /**
      * Override of PropertiesMixin _finalizeClass to create observers and
      * find the template.
diff --git a/polymer-element.js b/polymer-element.js
index 8cb6e5ccd2..0b9dd241d3 100644
--- a/polymer-element.js
+++ b/polymer-element.js
@@ -9,6 +9,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
 */
 
 import { ElementMixin } from './lib/mixins/element-mixin.js';
+export { version } from './lib/mixins/element-mixin.js';
 export { html } from './lib/utils/html-tag.js';
 
 /**
@@ -27,9 +28,3 @@ export { html } from './lib/utils/html-tag.js';
  *   attribute deserialization, and property change observation
  */
 export const PolymerElement = ElementMixin(HTMLElement);
-
-/**
- * Current Polymer version in Semver notation.
- * @type {String} Semver notation of the current version of Polymer.
- */
-export const version = '3.0.5';
diff --git a/test/unit/polymer.element.html b/test/unit/polymer.element.html
index b81d21e090..c20cfa8e7c 100644
--- a/test/unit/polymer.element.html
+++ b/test/unit/polymer.element.html
@@ -397,6 +397,9 @@ <h1>Sub template</h1>
     assert.equal(fixtureEl.getAttribute('prop'), 'propValue');
   });
 
+  test('version', function() {
+    assert.isOk(el.constructor.polymerElementVersion);
+  });
 });
 
 suite('subclass', function() {

From f845842fc9f4dd80dcb92c4b2ca3ff401491d164 Mon Sep 17 00:00:00 2001
From: Tim van der Lippe <tvanderlippe@gmail.com>
Date: Tue, 21 Aug 2018 22:10:57 +0200
Subject: [PATCH 3/3] Update paths in gulpfile

---
 gulpfile.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gulpfile.js b/gulpfile.js
index 431ad920c8..932d3b1e92 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -277,7 +277,7 @@ gulp.task('lint', gulp.series('lint-eslint'));
 gulp.task('generate-types', gulp.series('generate-typescript'));
 
 gulp.task('update-version', () => {
-  return gulp.src('polymer-element.js')
+  return gulp.src('lib/mixins/element-mixin.js')
   .pipe(replace(/(export const version = )'\d+\.\d+\.\d+'/, `$1'${require('./package.json').version}'`))
-  .pipe(gulp.dest('.'));
+  .pipe(gulp.dest('lib/mixins'));
 });