Support Svelte 3

fixes #546, #551, #552, #554

test/apps/errors/src/routes/blog/[slug].html

@@ -1,19 +1,21 @@
-<h1>{post.title}</h1>
+<script context="module">
+	export function preload({ params }) {
+		const { slug } = params;
+
+		return this.fetch(`blog/${slug}.json`).then(r => {
+			return r.json().then(data => {
+				if (r.status !== 200) {
+					this.error(r.status, data);
+				}
+
+				return data;
+			});
+		});
+	}
+</script>
 
 <script>
-	export default {
-		preload({ params }) {
-			const { slug } = params;
+	export let post;
+</script>
 
-			return this.fetch(`blog/${slug}.json`).then(r => {
-				return r.json().then(data => {
-					if (r.status !== 200) {
-						this.error(r.status, data);
-					}
-
-					return data;
-				});
-			});
-		}
-	};
-</script>
+<h1>{post.title}</h1>

test/apps/errors/src/routes/enhance-your-calm.html

@@ -1,7 +1,5 @@
-<script>
-	export default {
-		preload() {
-			this.error(420, 'Enhance your calm');
-		}
-	};
+<script context="module">
+	export function preload() {
+		this.error(420, 'Enhance your calm');
+	}
 </script>

test/apps/errors/src/routes/throw.html

@@ -1,7 +1,5 @@
-<script>
-	export default {
-		preload() {
-			throw new Error('nope');
-		}
-	};
+<script context="module">
+	export function preload() {
+		throw new Error('nope');
+	}
 </script>