diff --git a/src/generators/dom/index.ts b/src/generators/dom/index.ts
index 8d82fef182..6eaf256353 100644
--- a/src/generators/dom/index.ts
+++ b/src/generators/dom/index.ts
@@ -153,7 +153,7 @@ export default function dom(
 		${options.dev && `this._debugName = '${debugName}';`}
 		${options.dev && !generator.customElement &&
 			`if (!options || (!options.target && !options._root)) throw new Error("'target' is a required option");`}
-		this.options = options;
+		@init(this, options);
 		${generator.usesRefs && `this.refs = {};`}
 		this._state = ${templateProperties.data
 			? `@assign(@template.data(), options.data)`
@@ -168,17 +168,8 @@ export default function dom(
 		${generator.bindingGroups.length &&
 			`this._bindingGroups = [${Array(generator.bindingGroups.length).fill('[]').join(', ')}];`}
 
-		this._observers = {
-			pre: Object.create(null),
-			post: Object.create(null)
-		};
-
-		this._handlers = Object.create(null);
 		${templateProperties.ondestroy && `this._handlers.destroy = [@template.ondestroy]`}
 
-		this._root = options._root || this;
-		this._yield = options._yield;
-		this._bind = options._bind;
 		${generator.slots.size && `this._slotted = options.slots || {};`}
 
 		${generator.customElement ?
diff --git a/src/shared/index.js b/src/shared/index.js
index 34d85897df..001babe349 100644
--- a/src/shared/index.js
+++ b/src/shared/index.js
@@ -46,10 +46,6 @@ export function dispatchObservers(component, group, changed, newState, oldState)
 	}
 }
 
-export function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 export function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -60,6 +56,25 @@ export function fire(eventName, data) {
 	}
 }
 
+export function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+export function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 export function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
diff --git a/test/js/samples/collapses-text-around-comments/expected-bundle.js b/test/js/samples/collapses-text-around-comments/expected-bundle.js
index 5e61b5cb39..c421eadb7d 100644
--- a/test/js/samples/collapses-text-around-comments/expected-bundle.js
+++ b/test/js/samples/collapses-text-around-comments/expected-bundle.js
@@ -72,10 +72,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -86,6 +82,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -228,20 +243,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = assign(template.data(), options.data);
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!document.getElementById("svelte-3590263702-style")) add_css();
 
 	this._fragment = create_main_fragment(this._state, this);
diff --git a/test/js/samples/collapses-text-around-comments/expected.js b/test/js/samples/collapses-text-around-comments/expected.js
index dd6689737e..2ad2187e95 100644
--- a/test/js/samples/collapses-text-around-comments/expected.js
+++ b/test/js/samples/collapses-text-around-comments/expected.js
@@ -1,4 +1,4 @@
-import { appendNode, assign, createElement, createText, detachNode, insertNode, noop, proto, setAttribute } from "svelte/shared.js";
+import { appendNode, assign, createElement, createText, detachNode, init, insertNode, noop, proto, setAttribute } from "svelte/shared.js";
 
 var template = (function() {
 	return {
@@ -53,20 +53,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = assign(template.data(), options.data);
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!document.getElementById("svelte-3590263702-style")) add_css();
 
 	this._fragment = create_main_fragment(this._state, this);
diff --git a/test/js/samples/computed-collapsed-if/expected-bundle.js b/test/js/samples/computed-collapsed-if/expected-bundle.js
index 5e7b1d99c7..7296201e36 100644
--- a/test/js/samples/computed-collapsed-if/expected-bundle.js
+++ b/test/js/samples/computed-collapsed-if/expected-bundle.js
@@ -48,10 +48,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -62,6 +58,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -176,21 +191,10 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 	this._recompute({}, this._state, {}, true);
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/computed-collapsed-if/expected.js b/test/js/samples/computed-collapsed-if/expected.js
index 87804092f2..48e3445dd8 100644
--- a/test/js/samples/computed-collapsed-if/expected.js
+++ b/test/js/samples/computed-collapsed-if/expected.js
@@ -1,4 +1,4 @@
-import { assign, differs, noop, proto } from "svelte/shared.js";
+import { assign, differs, init, noop, proto } from "svelte/shared.js";
 
 var template = (function() {
 	return {
@@ -25,21 +25,10 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 	this._recompute({}, this._state, {}, true);
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/css-media-query/expected-bundle.js b/test/js/samples/css-media-query/expected-bundle.js
index bba05e07aa..30f8a023a9 100644
--- a/test/js/samples/css-media-query/expected-bundle.js
+++ b/test/js/samples/css-media-query/expected-bundle.js
@@ -68,10 +68,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -82,6 +78,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -210,20 +225,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!document.getElementById("svelte-2363328337-style")) add_css();
 
 	this._fragment = create_main_fragment(this._state, this);
diff --git a/test/js/samples/css-media-query/expected.js b/test/js/samples/css-media-query/expected.js
index 8a70516367..4dcb8f9fb3 100644
--- a/test/js/samples/css-media-query/expected.js
+++ b/test/js/samples/css-media-query/expected.js
@@ -1,4 +1,4 @@
-import { appendNode, assign, createElement, detachNode, insertNode, noop, proto, setAttribute } from "svelte/shared.js";
+import { appendNode, assign, createElement, detachNode, init, insertNode, noop, proto, setAttribute } from "svelte/shared.js";
 
 function encapsulateStyles(node) {
 	setAttribute(node, "svelte-2363328337", "");
@@ -39,20 +39,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!document.getElementById("svelte-2363328337-style")) add_css();
 
 	this._fragment = create_main_fragment(this._state, this);
diff --git a/test/js/samples/css-shadow-dom-keyframes/expected-bundle.js b/test/js/samples/css-shadow-dom-keyframes/expected-bundle.js
index 8e3fa4e47f..d19b44002d 100644
--- a/test/js/samples/css-shadow-dom-keyframes/expected-bundle.js
+++ b/test/js/samples/css-shadow-dom-keyframes/expected-bundle.js
@@ -68,10 +68,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -82,6 +78,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -198,20 +213,9 @@ function create_main_fragment(state, component) {
 class SvelteComponent extends HTMLElement {
 	constructor(options = {}) {
 		super();
-		this.options = options;
+		init(this, options);
 		this._state = options.data || {};
 
-		this._observers = {
-			pre: Object.create(null),
-			post: Object.create(null)
-		};
-
-		this._handlers = Object.create(null);
-
-		this._root = options._root || this;
-		this._yield = options._yield;
-		this._bind = options._bind;
-
 		this.attachShadow({ mode: 'open' });
 		this.shadowRoot.innerHTML = `<style>div{animation:foo 1s}@keyframes foo{0%{opacity:0}100%{opacity:1}}</style>`;
 
diff --git a/test/js/samples/css-shadow-dom-keyframes/expected.js b/test/js/samples/css-shadow-dom-keyframes/expected.js
index 87cf2940bd..2814d24901 100644
--- a/test/js/samples/css-shadow-dom-keyframes/expected.js
+++ b/test/js/samples/css-shadow-dom-keyframes/expected.js
@@ -1,4 +1,4 @@
-import { appendNode, assign, createElement, createText, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+import { appendNode, assign, createElement, createText, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var div, text;
@@ -27,20 +27,9 @@ function create_main_fragment(state, component) {
 class SvelteComponent extends HTMLElement {
 	constructor(options = {}) {
 		super();
-		this.options = options;
+		init(this, options);
 		this._state = options.data || {};
 
-		this._observers = {
-			pre: Object.create(null),
-			post: Object.create(null)
-		};
-
-		this._handlers = Object.create(null);
-
-		this._root = options._root || this;
-		this._yield = options._yield;
-		this._bind = options._bind;
-
 		this.attachShadow({ mode: 'open' });
 		this.shadowRoot.innerHTML = `<style>div{animation:foo 1s}@keyframes foo{0%{opacity:0}100%{opacity:1}}</style>`;
 
diff --git a/test/js/samples/each-block-changed-check/expected-bundle.js b/test/js/samples/each-block-changed-check/expected-bundle.js
index 28bd3c608d..97f6371f23 100644
--- a/test/js/samples/each-block-changed-check/expected-bundle.js
+++ b/test/js/samples/each-block-changed-check/expected-bundle.js
@@ -81,10 +81,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -95,6 +91,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -322,20 +337,9 @@ function create_each_block(state, each_block_value, comment, i, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/each-block-changed-check/expected.js b/test/js/samples/each-block-changed-check/expected.js
index 5fec542b69..8931d83aab 100644
--- a/test/js/samples/each-block-changed-check/expected.js
+++ b/test/js/samples/each-block-changed-check/expected.js
@@ -1,4 +1,4 @@
-import { appendNode, assign, createElement, createText, destroyEach, detachAfter, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+import { appendNode, assign, createElement, createText, destroyEach, detachAfter, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var text, p, text_1;
@@ -138,20 +138,9 @@ function create_each_block(state, each_block_value, comment, i, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/event-handlers-custom/expected-bundle.js b/test/js/samples/event-handlers-custom/expected-bundle.js
index 9a683c9dab..5f117e9ce9 100644
--- a/test/js/samples/event-handlers-custom/expected-bundle.js
+++ b/test/js/samples/event-handlers-custom/expected-bundle.js
@@ -68,10 +68,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -82,6 +78,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -221,20 +236,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/event-handlers-custom/expected.js b/test/js/samples/event-handlers-custom/expected.js
index e123de9c98..b08c6335f8 100644
--- a/test/js/samples/event-handlers-custom/expected.js
+++ b/test/js/samples/event-handlers-custom/expected.js
@@ -1,4 +1,4 @@
-import { appendNode, assign, createElement, createText, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+import { appendNode, assign, createElement, createText, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 var template = (function() {
 	return {
@@ -50,20 +50,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/if-block-no-update/expected-bundle.js b/test/js/samples/if-block-no-update/expected-bundle.js
index 00418f43cc..dcc893079b 100644
--- a/test/js/samples/if-block-no-update/expected-bundle.js
+++ b/test/js/samples/if-block-no-update/expected-bundle.js
@@ -72,10 +72,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -86,6 +82,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -263,20 +278,9 @@ function select_block_type(state) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/if-block-no-update/expected.js b/test/js/samples/if-block-no-update/expected.js
index 619465c331..4db0d11949 100644
--- a/test/js/samples/if-block-no-update/expected.js
+++ b/test/js/samples/if-block-no-update/expected.js
@@ -1,4 +1,4 @@
-import { appendNode, assign, createComment, createElement, createText, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+import { appendNode, assign, createComment, createElement, createText, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var if_block_anchor;
@@ -88,20 +88,9 @@ function select_block_type(state) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/if-block-simple/expected-bundle.js b/test/js/samples/if-block-simple/expected-bundle.js
index 6798ecce54..6612ead376 100644
--- a/test/js/samples/if-block-simple/expected-bundle.js
+++ b/test/js/samples/if-block-simple/expected-bundle.js
@@ -72,10 +72,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -86,6 +82,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -239,20 +254,9 @@ function create_if_block(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/if-block-simple/expected.js b/test/js/samples/if-block-simple/expected.js
index f003447f3b..e229b23ee8 100644
--- a/test/js/samples/if-block-simple/expected.js
+++ b/test/js/samples/if-block-simple/expected.js
@@ -1,4 +1,4 @@
-import { appendNode, assign, createComment, createElement, createText, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+import { appendNode, assign, createComment, createElement, createText, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var if_block_anchor;
@@ -64,20 +64,9 @@ function create_if_block(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-optimized-multiple/expected-bundle.js b/test/js/samples/inline-style-optimized-multiple/expected-bundle.js
index 019bf5e86b..190e86eb44 100644
--- a/test/js/samples/inline-style-optimized-multiple/expected-bundle.js
+++ b/test/js/samples/inline-style-optimized-multiple/expected-bundle.js
@@ -64,10 +64,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -78,6 +74,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -204,20 +219,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-optimized-multiple/expected.js b/test/js/samples/inline-style-optimized-multiple/expected.js
index 540cee99bc..2ae613643e 100644
--- a/test/js/samples/inline-style-optimized-multiple/expected.js
+++ b/test/js/samples/inline-style-optimized-multiple/expected.js
@@ -1,4 +1,4 @@
-import { assign, createElement, detachNode, insertNode, noop, proto, setStyle } from "svelte/shared.js";
+import { assign, createElement, detachNode, init, insertNode, noop, proto, setStyle } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var div;
@@ -37,20 +37,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-optimized-url/expected-bundle.js b/test/js/samples/inline-style-optimized-url/expected-bundle.js
index 05aa4df9d7..15076819cb 100644
--- a/test/js/samples/inline-style-optimized-url/expected-bundle.js
+++ b/test/js/samples/inline-style-optimized-url/expected-bundle.js
@@ -64,10 +64,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -78,6 +74,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -199,20 +214,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-optimized-url/expected.js b/test/js/samples/inline-style-optimized-url/expected.js
index d5d415aafd..de8e6ffec2 100644
--- a/test/js/samples/inline-style-optimized-url/expected.js
+++ b/test/js/samples/inline-style-optimized-url/expected.js
@@ -1,4 +1,4 @@
-import { assign, createElement, detachNode, insertNode, noop, proto, setStyle } from "svelte/shared.js";
+import { assign, createElement, detachNode, init, insertNode, noop, proto, setStyle } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var div;
@@ -32,20 +32,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-optimized/expected-bundle.js b/test/js/samples/inline-style-optimized/expected-bundle.js
index 91db41380b..8640267814 100644
--- a/test/js/samples/inline-style-optimized/expected-bundle.js
+++ b/test/js/samples/inline-style-optimized/expected-bundle.js
@@ -64,10 +64,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -78,6 +74,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -199,20 +214,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-optimized/expected.js b/test/js/samples/inline-style-optimized/expected.js
index e4816ffbfb..54b6de1646 100644
--- a/test/js/samples/inline-style-optimized/expected.js
+++ b/test/js/samples/inline-style-optimized/expected.js
@@ -1,4 +1,4 @@
-import { assign, createElement, detachNode, insertNode, noop, proto, setStyle } from "svelte/shared.js";
+import { assign, createElement, detachNode, init, insertNode, noop, proto, setStyle } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var div;
@@ -32,20 +32,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-unoptimized/expected-bundle.js b/test/js/samples/inline-style-unoptimized/expected-bundle.js
index cfe849e3f9..f12a26da07 100644
--- a/test/js/samples/inline-style-unoptimized/expected-bundle.js
+++ b/test/js/samples/inline-style-unoptimized/expected-bundle.js
@@ -64,10 +64,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -78,6 +74,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -210,20 +225,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/inline-style-unoptimized/expected.js b/test/js/samples/inline-style-unoptimized/expected.js
index 209cc90df6..63c32e26cf 100644
--- a/test/js/samples/inline-style-unoptimized/expected.js
+++ b/test/js/samples/inline-style-unoptimized/expected.js
@@ -1,4 +1,4 @@
-import { assign, createElement, createText, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+import { assign, createElement, createText, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var div, text, div_1, div_1_style_value;
@@ -43,20 +43,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/input-without-blowback-guard/expected-bundle.js b/test/js/samples/input-without-blowback-guard/expected-bundle.js
index c5cfd84bec..0a9b7dc47d 100644
--- a/test/js/samples/input-without-blowback-guard/expected-bundle.js
+++ b/test/js/samples/input-without-blowback-guard/expected-bundle.js
@@ -68,10 +68,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -82,6 +78,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -210,20 +225,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/input-without-blowback-guard/expected.js b/test/js/samples/input-without-blowback-guard/expected.js
index b459bdb7c8..4b987311f2 100644
--- a/test/js/samples/input-without-blowback-guard/expected.js
+++ b/test/js/samples/input-without-blowback-guard/expected.js
@@ -1,4 +1,4 @@
-import { addListener, assign, createElement, detachNode, insertNode, proto, removeListener } from "svelte/shared.js";
+import { addListener, assign, createElement, detachNode, init, insertNode, proto, removeListener } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var input;
@@ -39,20 +39,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/legacy-input-type/expected-bundle.js b/test/js/samples/legacy-input-type/expected-bundle.js
index f34e19450e..338b70b5d9 100644
--- a/test/js/samples/legacy-input-type/expected-bundle.js
+++ b/test/js/samples/legacy-input-type/expected-bundle.js
@@ -66,10 +66,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -80,6 +76,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -197,20 +212,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/legacy-input-type/expected.js b/test/js/samples/legacy-input-type/expected.js
index 9f585862e1..3e8b6714e0 100644
--- a/test/js/samples/legacy-input-type/expected.js
+++ b/test/js/samples/legacy-input-type/expected.js
@@ -1,4 +1,4 @@
-import { assign, createElement, detachNode, insertNode, noop, proto, setInputType } from "svelte/shared.js";
+import { assign, createElement, detachNode, init, insertNode, noop, proto, setInputType } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var input;
@@ -28,20 +28,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/legacy-quote-class/expected-bundle.js b/test/js/samples/legacy-quote-class/expected-bundle.js
index bf4bf86be9..8c10d0af06 100644
--- a/test/js/samples/legacy-quote-class/expected-bundle.js
+++ b/test/js/samples/legacy-quote-class/expected-bundle.js
@@ -83,10 +83,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -97,6 +93,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -222,20 +237,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/legacy-quote-class/expected.js b/test/js/samples/legacy-quote-class/expected.js
index 7eec7950fd..1a4de07a5b 100644
--- a/test/js/samples/legacy-quote-class/expected.js
+++ b/test/js/samples/legacy-quote-class/expected.js
@@ -1,4 +1,4 @@
-import { assign, children, claimElement, createElement, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+import { assign, children, claimElement, createElement, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var div;
@@ -36,20 +36,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/media-bindings/expected-bundle.js b/test/js/samples/media-bindings/expected-bundle.js
index 8dca649745..1f78b237cc 100644
--- a/test/js/samples/media-bindings/expected-bundle.js
+++ b/test/js/samples/media-bindings/expected-bundle.js
@@ -76,10 +76,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -90,6 +86,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -286,20 +301,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!options._root) {
 		this._oncreate = [];
 		this._beforecreate = [];
diff --git a/test/js/samples/media-bindings/expected.js b/test/js/samples/media-bindings/expected.js
index 738de4f815..b19656cf34 100644
--- a/test/js/samples/media-bindings/expected.js
+++ b/test/js/samples/media-bindings/expected.js
@@ -1,4 +1,4 @@
-import { addListener, assign, callAll, createElement, detachNode, insertNode, proto, removeListener, timeRangesToArray } from "svelte/shared.js";
+import { addListener, assign, callAll, createElement, detachNode, init, insertNode, proto, removeListener, timeRangesToArray } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var audio, audio_updating = false, audio_animationframe, audio_paused_value = true;
@@ -107,20 +107,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!options._root) {
 		this._oncreate = [];
 		this._beforecreate = [];
diff --git a/test/js/samples/non-imported-component/expected-bundle.js b/test/js/samples/non-imported-component/expected-bundle.js
index 6d5ea4bba3..261f63dcbd 100644
--- a/test/js/samples/non-imported-component/expected-bundle.js
+++ b/test/js/samples/non-imported-component/expected-bundle.js
@@ -62,10 +62,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -76,6 +72,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -213,20 +228,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!options._root) {
 		this._oncreate = [];
 		this._beforecreate = [];
diff --git a/test/js/samples/non-imported-component/expected.js b/test/js/samples/non-imported-component/expected.js
index de96d252be..ef6a106de7 100644
--- a/test/js/samples/non-imported-component/expected.js
+++ b/test/js/samples/non-imported-component/expected.js
@@ -1,6 +1,6 @@
 import Imported from 'Imported.html';
 
-import { assign, callAll, createText, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+import { assign, callAll, createText, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 var template = (function() {
 	return {
@@ -50,20 +50,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	if (!options._root) {
 		this._oncreate = [];
 		this._beforecreate = [];
diff --git a/test/js/samples/onrender-onteardown-rewritten/expected-bundle.js b/test/js/samples/onrender-onteardown-rewritten/expected-bundle.js
index 272f822a9e..95e0119a24 100644
--- a/test/js/samples/onrender-onteardown-rewritten/expected-bundle.js
+++ b/test/js/samples/onrender-onteardown-rewritten/expected-bundle.js
@@ -48,10 +48,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -62,6 +58,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -175,21 +190,11 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
 	this._handlers.destroy = [template.ondestroy];
 
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	var oncreate = template.oncreate.bind(this);
 
 	if (!options._root) {
diff --git a/test/js/samples/onrender-onteardown-rewritten/expected.js b/test/js/samples/onrender-onteardown-rewritten/expected.js
index 32a116b3a1..6e2df0f9be 100644
--- a/test/js/samples/onrender-onteardown-rewritten/expected.js
+++ b/test/js/samples/onrender-onteardown-rewritten/expected.js
@@ -1,4 +1,4 @@
-import { assign, callAll, noop, proto } from "svelte/shared.js";
+import { assign, callAll, init, noop, proto } from "svelte/shared.js";
 
 var template = (function() {
 	return {
@@ -24,21 +24,11 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
 	this._handlers.destroy = [template.ondestroy]
 
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	var oncreate = template.oncreate.bind(this);
 
 	if (!options._root) {
diff --git a/test/js/samples/setup-method/expected-bundle.js b/test/js/samples/setup-method/expected-bundle.js
index 6967036e49..0f2fb2685c 100644
--- a/test/js/samples/setup-method/expected-bundle.js
+++ b/test/js/samples/setup-method/expected-bundle.js
@@ -48,10 +48,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -62,6 +58,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -186,20 +201,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/setup-method/expected.js b/test/js/samples/setup-method/expected.js
index 50d2ec47c5..90d98f0947 100644
--- a/test/js/samples/setup-method/expected.js
+++ b/test/js/samples/setup-method/expected.js
@@ -1,4 +1,4 @@
-import { assign, noop, proto } from "svelte/shared.js";
+import { assign, init, noop, proto } from "svelte/shared.js";
 
 var template = (function() {
 	return {
@@ -35,20 +35,9 @@ function create_main_fragment(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/use-elements-as-anchors/expected-bundle.js b/test/js/samples/use-elements-as-anchors/expected-bundle.js
index dc41a1501f..d3ae8b9976 100644
--- a/test/js/samples/use-elements-as-anchors/expected-bundle.js
+++ b/test/js/samples/use-elements-as-anchors/expected-bundle.js
@@ -72,10 +72,6 @@ function dispatchObservers(component, group, changed, newState, oldState) {
 	}
 }
 
-function get(key) {
-	return key ? this._state[key] : this._state;
-}
-
 function fire(eventName, data) {
 	var handlers =
 		eventName in this._handlers && this._handlers[eventName].slice();
@@ -86,6 +82,25 @@ function fire(eventName, data) {
 	}
 }
 
+function get(key) {
+	return key ? this._state[key] : this._state;
+}
+
+function init(component, options) {
+	component.options = options;
+
+	component._observers = {
+		pre: Object.create(null),
+		post: Object.create(null)
+	};
+
+	component._handlers = Object.create(null);
+
+	component._root = options._root || component;
+	component._yield = options._yield;
+	component._bind = options._bind;
+}
+
 function observe(key, callback, options) {
 	var group = options && options.defer
 		? this._observers.post
@@ -423,20 +438,9 @@ function create_if_block_4(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {
diff --git a/test/js/samples/use-elements-as-anchors/expected.js b/test/js/samples/use-elements-as-anchors/expected.js
index d520ee49e6..156f83674a 100644
--- a/test/js/samples/use-elements-as-anchors/expected.js
+++ b/test/js/samples/use-elements-as-anchors/expected.js
@@ -1,4 +1,4 @@
-import { appendNode, assign, createComment, createElement, createText, detachNode, insertNode, noop, proto } from "svelte/shared.js";
+import { appendNode, assign, createComment, createElement, createText, detachNode, init, insertNode, noop, proto } from "svelte/shared.js";
 
 function create_main_fragment(state, component) {
 	var div, text, p, text_1, text_2, text_3, text_4, p_1, text_5, text_6, text_8, if_block_4_anchor;
@@ -248,20 +248,9 @@ function create_if_block_4(state, component) {
 }
 
 function SvelteComponent(options) {
-	this.options = options;
+	init(this, options);
 	this._state = options.data || {};
 
-	this._observers = {
-		pre: Object.create(null),
-		post: Object.create(null)
-	};
-
-	this._handlers = Object.create(null);
-
-	this._root = options._root || this;
-	this._yield = options._yield;
-	this._bind = options._bind;
-
 	this._fragment = create_main_fragment(this._state, this);
 
 	if (options.target) {