Polymer 3 - Google Maps - google-maps-api-3

Question

I would like to know how to include Google Map in Polymer 3. I have just upgraded to Polymer 3 from Polymer 2. This is my sample that is not working base of the starter-kit
import { PolymerElement, html } from '#polymer/polymer/polymer-element.js';
import '#em-polymer/google-map/google-map.js';
import '#em-polymer/google-map/google-map-marker.js';
import './shared-styles.js';
class MyView1 extends PolymerElement {
static get template() {
return html`
<style include="shared-styles">
:host {
display: block;
padding: 10px;
}
google-map {
height: 600px;
width: 600px;
}
</style>
<google-map latitude="37.779" longitude="-122.3892" min-zoom="9" max-zoom="11" language="en" api-key="XYZ">
</google-map>
<div class="card">
<div class="circle">1</div>
<h1>View One</h1>
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</div>
`;
}
}
window.customElements.define('my-view1', MyView1);
I get the following 2 errors:
element-mixin.js:322 template getter must return HTMLTemplateElement
and
Uncaught TypeError: Cannot read property 'api' of undefined
at HTMLElement._initGMap (google-map.js:480)
at HTMLElement.attached (google-map.js:457)
at HTMLElement.attached (class.js:262)
at HTMLElement.connectedCallback (legacy-element-mixin.js:117)
at HTMLElement._attachDom (element-mixin.js:653)
at HTMLElement._readyClients (element-mixin.js:620)
at HTMLElement._flushClients (property-effects.js:1749)
at HTMLElement.ready (property-effects.js:1853)
at HTMLElement.ready (element-mixin.js:604)
at HTMLElement._enableProperties (properties-changed.js:363)

Answer 1

#em-polymer/google-map/google-map.js was
import { Polymer } from '../../#polymer/polymer/lib/legacy/polymer-fn.js';
import { IronResizableBehavior } from '../../#polymer/iron-resizable-behavior/iron-resizable-behavior.js';
import '../google-apis/google-maps-api.js';
import './google-map-marker.js';
Polymer({
_template: `
<style>
and fix is
import { Polymer } from '../../#polymer/polymer/lib/legacy/polymer-fn.js';
import { IronResizableBehavior } from '../../#polymer/iron-resizable-behavior/iron-resizable-behavior.js';
import '../google-apis/google-maps-api.js';
import './google-map-marker.js';
import { html } from '#polymer/polymer/lib/utils/html-tag.js';
Polymer({
_template: html`
<style>