diff --git a/src/internal/Component.js b/src/internal/Component.js
index f707dfb18d..4a7293ddae 100644
--- a/src/internal/Component.js
+++ b/src/internal/Component.js
@@ -1,7 +1,6 @@
-import { add_render_callback, flush, intros, schedule_update, dirty_components } from './scheduler.js';
-import { current_component, set_current_component } from './lifecycle.js'
-import { is_function, run, run_all, noop } from './utils.js';
-import { blank_object } from './utils.js';
+import { add_render_callback, flush, schedule_update, dirty_components } from './scheduler.js';
+import { current_component, set_current_component } from './lifecycle.js';
+import { blank_object, is_function, run, run_all, noop } from './utils.js';
 import { children } from './dom.js';
 
 export function bind(component, name, callback) {
@@ -23,7 +22,7 @@ export function mount_component(component, target, anchor) {
 		if (on_destroy) {
 			on_destroy.push(...new_on_destroy);
 		} else {
-			// Edge case — component was destroyed immediately,
+			// Edge case - component was destroyed immediately,
 			// most likely as a result of a binding initialising
 			run_all(new_on_destroy);
 		}
@@ -129,7 +128,7 @@ if (typeof HTMLElement !== 'undefined') {
 		}
 
 		connectedCallback() {
-			for (let key in this.$$.slotted) {
+			for (const key in this.$$.slotted) {
 				this.appendChild(this.$$.slotted[key]);
 			}
 		}
@@ -157,7 +156,7 @@ if (typeof HTMLElement !== 'undefined') {
 		$set() {
 			// overridden by instance, if it has props
 		}
-	}
+	};
 }
 
 export class SvelteComponent {
@@ -193,7 +192,7 @@ export class SvelteComponentDev extends SvelteComponent {
 	$destroy() {
 		super.$destroy();
 		this.$destroy = () => {
-			console.warn(`Component was already destroyed`);
+			console.warn(`Component was already destroyed`); // eslint-disable-line no-console
 		};
 	}
 }
\ No newline at end of file
diff --git a/src/internal/await-block.js b/src/internal/await-block.js
index 60584b59e5..9e14c50342 100644
--- a/src/internal/await-block.js
+++ b/src/internal/await-block.js
@@ -3,7 +3,7 @@ import { check_outros, group_outros, on_outro } from './transitions.js';
 import { flush } from '../internal/scheduler.js';
 
 export function handle_promise(promise, info) {
-	var token = info.token = {};
+	const token = info.token = {};
 
 	function update(type, index, key, value) {
 		if (info.token !== token) return;
diff --git a/src/internal/dom.js b/src/internal/dom.js
index 3df4690a1e..1c22bf4c70 100644
--- a/src/internal/dom.js
+++ b/src/internal/dom.js
@@ -29,7 +29,7 @@ export function detach_after(before) {
 }
 
 export function destroy_each(iterations, detaching) {
-	for (var i = 0; i < iterations.length; i += 1) {
+	for (let i = 0; i < iterations.length; i += 1) {
 		if (iterations[i]) iterations[i].d(detaching);
 	}
 }
@@ -79,7 +79,7 @@ export function attr(node, attribute, value) {
 }
 
 export function set_attributes(node, attributes) {
-	for (var key in attributes) {
+	for (const key in attributes) {
 		if (key === 'style') {
 			node.style.cssText = attributes[key];
 		} else if (key in node) {
@@ -103,8 +103,8 @@ export function xlink_attr(node, attribute, value) {
 }
 
 export function get_binding_group_value(group) {
-	var value = [];
-	for (var i = 0; i < group.length; i += 1) {
+	const value = [];
+	for (let i = 0; i < group.length; i += 1) {
 		if (group[i].checked) value.push(group[i].__value);
 	}
 	return value;
@@ -115,8 +115,8 @@ export function to_number(value) {
 }
 
 export function time_ranges_to_array(ranges) {
-	var array = [];
-	for (var i = 0; i < ranges.length; i += 1) {
+	const array = [];
+	for (let i = 0; i < ranges.length; i += 1) {
 		array.push({ start: ranges.start(i), end: ranges.end(i) });
 	}
 	return array;
@@ -127,11 +127,11 @@ export function children(element) {
 }
 
 export function claim_element(nodes, name, attributes, svg) {
-	for (var i = 0; i < nodes.length; i += 1) {
-		var node = nodes[i];
+	for (let i = 0; i < nodes.length; i += 1) {
+		const node = nodes[i];
 		if (node.nodeName === name) {
-			for (var j = 0; j < node.attributes.length; j += 1) {
-				var attribute = node.attributes[j];
+			for (let j = 0; j < node.attributes.length; j += 1) {
+				const attribute = node.attributes[j];
 				if (!attributes[attribute.name]) node.removeAttribute(attribute.name);
 			}
 			return nodes.splice(i, 1)[0]; // TODO strip unwanted attributes
@@ -142,8 +142,8 @@ export function claim_element(nodes, name, attributes, svg) {
 }
 
 export function claim_text(nodes, data) {
-	for (var i = 0; i < nodes.length; i += 1) {
-		var node = nodes[i];
+	for (let i = 0; i < nodes.length; i += 1) {
+		const node = nodes[i];
 		if (node.nodeType === 3) {
 			node.data = data;
 			return nodes.splice(i, 1)[0];
@@ -160,7 +160,9 @@ export function set_data(text, data) {
 export function set_input_type(input, type) {
 	try {
 		input.type = type;
-	} catch (e) {}
+	} catch (e) {
+		// do nothing
+	}
 }
 
 export function set_style(node, key, value) {
@@ -168,8 +170,8 @@ export function set_style(node, key, value) {
 }
 
 export function select_option(select, value) {
-	for (var i = 0; i < select.options.length; i += 1) {
-		var option = select.options[i];
+	for (let i = 0; i < select.options.length; i += 1) {
+		const option = select.options[i];
 
 		if (option.__value === value) {
 			option.selected = true;
@@ -179,21 +181,19 @@ export function select_option(select, value) {
 }
 
 export function select_options(select, value) {
-	for (var i = 0; i < select.options.length; i += 1) {
-		var option = select.options[i];
+	for (let i = 0; i < select.options.length; i += 1) {
+		const option = select.options[i];
 		option.selected = ~value.indexOf(option.__value);
 	}
 }
 
 export function select_value(select) {
-	var selectedOption = select.querySelector(':checked') || select.options[0];
-	return selectedOption && selectedOption.__value;
+	const selected_option = select.querySelector(':checked') || select.options[0];
+	return selected_option && selected_option.__value;
 }
 
 export function select_multiple_value(select) {
-	return [].map.call(select.querySelectorAll(':checked'), function(option) {
-		return option.__value;
-	});
+	return [].map.call(select.querySelectorAll(':checked'), option => option.__value);
 }
 
 export function add_resize_listener(element, fn) {
diff --git a/src/internal/keyed-each.js b/src/internal/keyed-each.js
index e2ce67d13c..307a6b0dbc 100644
--- a/src/internal/keyed-each.js
+++ b/src/internal/keyed-each.js
@@ -19,22 +19,22 @@ export function fix_and_outro_and_destroy_block(block, lookup) {
 }
 
 export function update_keyed_each(old_blocks, changed, get_key, dynamic, ctx, list, lookup, node, destroy, create_each_block, next, get_context) {
-	var o = old_blocks.length;
-	var n = list.length;
+	let o = old_blocks.length;
+	let n = list.length;
 
-	var i = o;
-	var old_indexes = {};
+	let i = o;
+	const old_indexes = {};
 	while (i--) old_indexes[old_blocks[i].key] = i;
 
-	var new_blocks = [];
-	var new_lookup = {};
-	var deltas = {};
+	const new_blocks = [];
+	const new_lookup = {};
+	const deltas = {};
 
-	var i = n;
+	i = n;
 	while (i--) {
-		var child_ctx = get_context(ctx, list, i);
-		var key = get_key(child_ctx);
-		var block = lookup[key];
+		const child_ctx = get_context(ctx, list, i);
+		const key = get_key(child_ctx);
+		let block = lookup[key];
 
 		if (!block) {
 			block = create_each_block(key, child_ctx);
@@ -48,8 +48,8 @@ export function update_keyed_each(old_blocks, changed, get_key, dynamic, ctx, li
 		if (key in old_indexes) deltas[key] = Math.abs(i - old_indexes[key]);
 	}
 
-	var will_move = {};
-	var did_move = {};
+	const will_move = {};
+	const did_move = {};
 
 	function insert(block) {
 		if (block.i) block.i(1);
@@ -60,10 +60,10 @@ export function update_keyed_each(old_blocks, changed, get_key, dynamic, ctx, li
 	}
 
 	while (o && n) {
-		var new_block = new_blocks[n - 1];
-		var old_block = old_blocks[o - 1];
-		var new_key = new_block.key;
-		var old_key = old_block.key;
+		const new_block = new_blocks[n - 1];
+		const old_block = old_blocks[o - 1];
+		const new_key = new_block.key;
+		const old_key = old_block.key;
 
 		if (new_block === old_block) {
 			// do nothing
@@ -96,7 +96,7 @@ export function update_keyed_each(old_blocks, changed, get_key, dynamic, ctx, li
 	}
 
 	while (o--) {
-		var old_block = old_blocks[o];
+		const old_block = old_blocks[o];
 		if (!new_lookup[old_block.key]) destroy(old_block, lookup);
 	}
 
diff --git a/src/internal/scheduler.js b/src/internal/scheduler.js
index 6c62af905c..b2b5bd5200 100644
--- a/src/internal/scheduler.js
+++ b/src/internal/scheduler.js
@@ -1,7 +1,7 @@
 import { run_all } from './utils.js';
 import { set_current_component } from './lifecycle.js';
 
-export let dirty_components = [];
+export const dirty_components = [];
 export const intros = { enabled: false };
 
 let update_promise;
diff --git a/src/internal/spread.js b/src/internal/spread.js
index 50617fe8fb..2b4c8c42d5 100644
--- a/src/internal/spread.js
+++ b/src/internal/spread.js
@@ -1,20 +1,20 @@
 export function get_spread_update(levels, updates) {
-	var update = {};
+	const update = {};
 
-	var to_null_out = {};
-	var accounted_for = {};
+	const to_null_out = {};
+	const accounted_for = {};
 
-	var i = levels.length;
+	let i = levels.length;
 	while (i--) {
-		var o = levels[i];
-		var n = updates[i];
+		const o = levels[i];
+		const n = updates[i];
 
 		if (n) {
-			for (var key in o) {
+			for (const key in o) {
 				if (!(key in n)) to_null_out[key] = 1;
 			}
 
-			for (var key in n) {
+			for (const key in n) {
 				if (!accounted_for[key]) {
 					update[key] = n[key];
 					accounted_for[key] = 1;
@@ -23,13 +23,13 @@ export function get_spread_update(levels, updates) {
 
 			levels[i] = n;
 		} else {
-			for (var key in o) {
+			for (const key in o) {
 				accounted_for[key] = 1;
 			}
 		}
 	}
 
-	for (var key in to_null_out) {
+	for (const key in to_null_out) {
 		if (!(key in update)) update[key] = undefined;
 	}
 
diff --git a/src/internal/ssr.js b/src/internal/ssr.js
index a86982ede8..e8d96c609c 100644
--- a/src/internal/ssr.js
+++ b/src/internal/ssr.js
@@ -1,7 +1,7 @@
 import { set_current_component, current_component } from './lifecycle.js';
 import { run_all, blank_object } from './utils.js';
 
-export const invalid_attribute_name_character = /[\s'">\/=\u{FDD0}-\u{FDEF}\u{FFFE}\u{FFFF}\u{1FFFE}\u{1FFFF}\u{2FFFE}\u{2FFFF}\u{3FFFE}\u{3FFFF}\u{4FFFE}\u{4FFFF}\u{5FFFE}\u{5FFFF}\u{6FFFE}\u{6FFFF}\u{7FFFE}\u{7FFFF}\u{8FFFE}\u{8FFFF}\u{9FFFE}\u{9FFFF}\u{AFFFE}\u{AFFFF}\u{BFFFE}\u{BFFFF}\u{CFFFE}\u{CFFFF}\u{DFFFE}\u{DFFFF}\u{EFFFE}\u{EFFFF}\u{FFFFE}\u{FFFFF}\u{10FFFE}\u{10FFFF}]/u;
+export const invalid_attribute_name_character = /[\s'">/=\u{FDD0}-\u{FDEF}\u{FFFE}\u{FFFF}\u{1FFFE}\u{1FFFF}\u{2FFFE}\u{2FFFF}\u{3FFFE}\u{3FFFF}\u{4FFFE}\u{4FFFF}\u{5FFFE}\u{5FFFF}\u{6FFFE}\u{6FFFF}\u{7FFFE}\u{7FFFF}\u{8FFFE}\u{8FFFF}\u{9FFFE}\u{9FFFF}\u{AFFFE}\u{AFFFF}\u{BFFFE}\u{BFFFF}\u{CFFFE}\u{CFFFF}\u{DFFFE}\u{DFFFF}\u{EFFFE}\u{EFFFF}\u{FFFFE}\u{FFFFF}\u{10FFFE}\u{10FFFF}]/u;
 // https://html.spec.whatwg.org/multipage/syntax.html#attributes-2
 // https://infra.spec.whatwg.org/#noncharacter
 
@@ -60,8 +60,8 @@ export function validate_component(component, name) {
 }
 
 export function debug(file, line, column, values) {
-	console.log(`{@debug} ${file ? file + ' ' : ''}(${line}:${column})`);
-	console.log(values);
+	console.log(`{@debug} ${file ? file + ' ' : ''}(${line}:${column})`); // eslint-disable-line no-console
+	console.log(values); // eslint-disable-line no-console
 	return '';
 }
 
diff --git a/src/internal/transitions.js b/src/internal/transitions.js
index a6579b0cef..3649de2b0c 100644
--- a/src/internal/transitions.js
+++ b/src/internal/transitions.js
@@ -246,7 +246,7 @@ export function create_bidirectional_transition(node, fn, params, intro) {
 			if (b) tick(0, 1);
 
 			running_program = init(program, duration);
-			add_render_callback(() => dispatch(node, b, 'start'))
+			add_render_callback(() => dispatch(node, b, 'start'));
 
 			loop(now => {
 				if (pending_program && now > pending_program.start) {
diff --git a/src/internal/utils.js b/src/internal/utils.js
index 05ba599b22..5e2f8b1165 100644
--- a/src/internal/utils.js
+++ b/src/internal/utils.js
@@ -3,7 +3,7 @@ export function noop() {}
 export const identity = x => x;
 
 export function assign(tar, src) {
-	for (var k in src) tar[k] = src[k];
+	for (const k in src) tar[k] = src[k];
 	return tar;
 }
 
diff --git a/src/motion/spring.js b/src/motion/spring.js
index 10189ef7d9..2a5824f088 100644
--- a/src/motion/spring.js
+++ b/src/motion/spring.js
@@ -1,5 +1,5 @@
-import { writable } from 'svelte/store';
-import { loop } from 'svelte/internal';
+import { writable } from 'svelte/store'; // eslint-disable-line import/no-unresolved
+import { loop } from 'svelte/internal'; // eslint-disable-line import/no-unresolved
 import { is_date } from './utils.js';
 
 function get_initial_velocity(value) {
@@ -120,7 +120,7 @@ export function spring(value, opts = {}) {
 			last_time = window.performance.now();
 			settled = false;
 
-			task = loop(now=> {
+			task = loop(now => {
 				({ value, settled } = tick_spring(
 					velocity,
 					value,
diff --git a/src/motion/tweened.js b/src/motion/tweened.js
index 49f1217a4e..a3b5f7331e 100644
--- a/src/motion/tweened.js
+++ b/src/motion/tweened.js
@@ -1,6 +1,6 @@
-import { writable } from 'svelte/store';
-import { assign, loop } from 'svelte/internal';
-import { linear } from 'svelte/easing';
+import { writable } from 'svelte/store'; // eslint-disable-line import/no-unresolved
+import { assign, loop } from 'svelte/internal'; // eslint-disable-line import/no-unresolved
+import { linear } from 'svelte/easing'; // eslint-disable-line import/no-unresolved
 import { is_date } from './utils.js';
 
 function get_interpolator(a, b) {