diff --git a/js/index.ts b/js/index.ts
index ec480fa..cb1eca0 100644
--- a/js/index.ts
+++ b/js/index.ts
@@ -1,6 +1,6 @@
 import { decompressSync } from "fflate";
 import v2 from "./v2";
-export * from './adapters';
+export * from "./adapters";
 
 export interface BufferPosition {
 	buf: Uint8Array;
@@ -372,10 +372,14 @@ function deserializeIndex(buffer: ArrayBuffer): Entry[] {
 function detectVersion(a: ArrayBuffer): number {
 	const v = new DataView(a);
 	if (v.getUint16(2, true) === 2) {
-		console.warn("PMTiles spec version 2 has been deprecated; please see github.com/protomaps/PMTiles for tools to upgrade");
+		console.warn(
+			"PMTiles spec version 2 has been deprecated; please see github.com/protomaps/PMTiles for tools to upgrade"
+		);
 		return 2;
 	} else if (v.getUint16(2, true) === 1) {
-		console.warn("PMTiles spec version 1 has been deprecated; please see github.com/protomaps/PMTiles for tools to upgrade");
+		console.warn(
+			"PMTiles spec version 1 has been deprecated; please see github.com/protomaps/PMTiles for tools to upgrade"
+		);
 		return 1;
 	}
 	return 3;
@@ -404,7 +408,7 @@ async function getHeaderAndRoot(
 	source: Source,
 	prefetch: boolean
 ): Promise<[Header, [string, number, Entry[] | ArrayBuffer]?]> {
-	let resp = await source.getBytes(0, 16384);
+	const resp = await source.getBytes(0, 16384);
 
 	const v = new DataView(resp.data);
 	if (v.getUint16(0, true) !== 0x4d50) {
@@ -450,7 +454,7 @@ async function getDirectory(
 	length: number,
 	header: Header
 ): Promise<Entry[]> {
-	let resp = await source.getBytes(offset, length);
+	const resp = await source.getBytes(offset, length);
 
 	if (header.etag && header.etag !== resp.etag) {
 		throw new VersionMismatch("ETag mismatch: " + header.etag);
@@ -494,7 +498,7 @@ export class ResolvedValueCache {
 			return data as Header;
 		}
 
-		let res = await getHeaderAndRoot(source, this.prefetch);
+		const res = await getHeaderAndRoot(source, this.prefetch);
 		if (res[1]) {
 			this.cache.set(res[1][0], {
 				lastUsed: this.counter++,
@@ -553,7 +557,7 @@ export class ResolvedValueCache {
 			return data as ArrayBuffer;
 		}
 
-		let resp = await source.getBytes(offset, length);
+		const resp = await source.getBytes(offset, length);
 		if (header.etag && header.etag !== resp.etag) {
 			throw new VersionMismatch("ETag mismatch: " + header.etag);
 		}
@@ -765,9 +769,12 @@ export class PMTiles {
 		if (header.specVersion < 3) {
 			return [];
 		}
-		let d_o = header.rootDirectoryOffset;
-		let d_l = header.rootDirectoryLength;
-		return await this.cache.getDirectory(this.source, d_o, d_l, header);
+		return await this.cache.getDirectory(
+			this.source,
+			header.rootDirectoryOffset,
+			header.rootDirectoryLength,
+			header
+		);
 	}
 
 	async getHeader() {
diff --git a/js/v2.ts b/js/v2.ts
index ed42903..e628f25 100644
--- a/js/v2.ts
+++ b/js/v2.ts
@@ -188,7 +188,7 @@ export const deriveLeaf = (view: DataView, tile: Zxy): Zxy | null => {
 	const numEntries = view.byteLength / 17;
 	const entry = parseEntry(view, numEntries - 1);
 	if (entry.is_dir) {
-		let leaf_level = entry.z;
+		const leaf_level = entry.z;
 		const level_diff = tile.z - leaf_level;
 		const leaf_x = Math.trunc(tile.x / (1 << level_diff));
 		const leaf_y = Math.trunc(tile.y / (1 << level_diff));
@@ -198,7 +198,7 @@ export const deriveLeaf = (view: DataView, tile: Zxy): Zxy | null => {
 };
 
 async function getHeader(source: Source): Promise<Header> {
-	let resp = await source.getBytes(0, 512000);
+	const resp = await source.getBytes(0, 512000);
 
 	const dataview = new DataView(resp.data);
 
@@ -233,7 +233,7 @@ async function getHeader(source: Source): Promise<Header> {
 	let max_lat = 85.0;
 
 	if (json_metadata.bounds) {
-		let split = json_metadata.bounds.split(",");
+		const split = json_metadata.bounds.split(",");
 		min_lon = +split[0];
 		min_lat = +split[1];
 		max_lon = +split[2];
@@ -241,7 +241,7 @@ async function getHeader(source: Source): Promise<Header> {
 	}
 
 	if (json_metadata.center) {
-		let split = json_metadata.center.split(",");
+		const split = json_metadata.center.split(",");
 		center_lon = +split[0];
 		center_lat = +split[1];
 		center_zoom = +split[2];
@@ -299,10 +299,10 @@ async function getZxy(
 
 	const entry = queryTile(new DataView(root_dir), z, x, y);
 	if (entry) {
-		let resp = await source.getBytes(entry.offset, entry.length, signal);
+		const resp = await source.getBytes(entry.offset, entry.length, signal);
 		let tile_data = resp.data;
 
-		let view = new DataView(tile_data);
+		const view = new DataView(tile_data);
 		if (view.getUint8(0) == 0x1f && view.getUint8(1) == 0x8b) {
 			tile_data = decompressSync(new Uint8Array(tile_data));
 		}
@@ -331,16 +331,16 @@ async function getZxy(
 			if (header.specVersion === 1) {
 				leaf_dir = sortDir(leaf_dir);
 			}
-			let tile_entry = queryTile(new DataView(leaf_dir), z, x, y);
+			const tile_entry = queryTile(new DataView(leaf_dir), z, x, y);
 			if (tile_entry) {
-				let resp = await source.getBytes(
+				const resp = await source.getBytes(
 					tile_entry.offset,
 					tile_entry.length,
 					signal
 				);
 				let tile_data = resp.data;
 
-				let view = new DataView(tile_data);
+				const view = new DataView(tile_data);
 				if (view.getUint8(0) == 0x1f && view.getUint8(1) == 0x8b) {
 					tile_data = decompressSync(new Uint8Array(tile_data));
 				}