allow passing in context in constructor

src/runtime/internal/Component.ts

@@ -120,7 +120,7 @@ export function init(component, options, instance, create_fragment, not_equal, p
 		on_disconnect: [],
 		before_update: [],
 		after_update: [],
-		context: new Map(parent_component ? parent_component.$$.context : []),
+		context: new Map(parent_component ? parent_component.$$.context : options.context ? Object.entries(options.context) : []),
 
 		// everything else
 		callbacks: blank_object(),

src/runtime/tsconfig.json

@@ -3,7 +3,7 @@
 	"include": ["."],
 
 	"compilerOptions": {
-		"lib": ["es2015", "dom", "dom.iterable"],
+		"lib": ["es2017", "dom", "dom.iterable"],
 		"target": "es2015",
 		"types": [],
 

test/runtime/samples/constructor-pass-context/Component.svelte

@@ -0,0 +1,9 @@
+<script>
+	import { getContext } from 'svelte';
+
+	const value = getContext('key');
+	const fn = getContext('fn');
+</script>
+
+<div>{value}</div>
+<button on:click={() => fn('hello world')} />

test/runtime/samples/constructor-pass-context/_config.js

@@ -0,0 +1,22 @@
+export default {
+	async test({ assert, target, window }) {
+		const Component = require('./Component.svelte').default;
+
+		const called = [];
+		const component = new Component({
+			target,
+			context: {
+				key: 'svelte',
+				fn: (value) => called.push(value)
+			}
+		});
+		assert.htmlEqual(target.innerHTML, '<div>svelte</div><button></button>');
+
+		const button = target.querySelector('button');
+		await button.dispatchEvent(new window.MouseEvent('click'));
+
+		assert.deepEqual(called, ['hello world']);
+
+		component.$destroy();
+	}
+};