fix no-unused-vars for variables assigned to in template but only used in script

Fixes #64

Author: Conduitry

src/preprocess.js

@@ -150,6 +150,8 @@ export const preprocess = text => {
 				}
 			},
 		});
+
+		block.transformed_code += `{${vars.filter(v => v.referenced_from_script).map(v => v.name)}}`;
 	}
 
 	// return processed string

test/samples/script-reference/.eslintrc.js

@@ -0,0 +1,5 @@
+module.exports = {
+	rules: {
+		'no-unused-vars': 'error',
+	},
+};

test/samples/script-reference/Input.svelte

@@ -0,0 +1,8 @@
+<script>
+	let foo = false;
+	setInterval(() => {
+		console.log(foo);
+	}, 1000);
+</script>
+
+<div on:click={() => foo = true}>foo</div>

test/samples/script-reference/expected.json

@@ -0,0 +1 @@
+[]