diff --git a/script/gallery.ts b/script/gallery.ts
index c1079a0..9e8cbdc 100644
--- a/script/gallery.ts
+++ b/script/gallery.ts
@@ -18,30 +18,30 @@ function fillSets(): [Set<string>, Set<string>] {
 }
 
 function updateItems() {
-  let [reqTags, excTags] = fillSets();
-  let anyReq = reqTags.size > 0;
+  const [reqTags, excTags] = fillSets();
+  const anyReq = reqTags.size > 0;
 
-  for (let [year, items] of itemsByYear) {
+  for (const [year, items] of itemsByYear) {
     let hide = true;
 
-    for (let item of items) {
-      let req = tags.get(item)?.some(x => reqTags.has(x)) ?? false;
-      let exc = tags.get(item)?.some(x => excTags.has(x)) ?? false;
-      let hidden = exc || (anyReq && !req);
+    for (const item of items) {
+      const req = tags.get(item)?.some(x => reqTags.has(x)) ?? false;
+      const exc = tags.get(item)?.some(x => excTags.has(x)) ?? false;
+      const hidden = exc || (anyReq && !req);
 
       item.hidden = hidden;
       hide &&= hidden;
     }
 
-    let marker = document.getElementById(`marker-${year}`);
+    const marker = document.getElementById(`marker-${year}`);
     if (marker !== null) marker.hidden = hide;
   }
 
   function disp(pfx: string, tags: Iterable<string>) {
     return [...tags].map(x => pfx + x).join('\u2003'); // em space
   }
-  let plus  = disp('+\u2009', Array.from(reqTags)); // thin space
-  let minus = disp('-\u2009', Array.from(excTags));
+  const plus  = disp('+\u2009', reqTags); // thin space
+  const minus = disp('-\u2009', excTags);
   document.getElementById('filters-details')!.dataset.filters =
     `${plus}\u2003${minus}`.trim();
 }
@@ -61,7 +61,7 @@ function converseId(id: string) {
 
 function toggle(checkbox: HTMLInputElement) {
   if (checkbox.checked) {
-    let converse = document.getElementById(converseId(checkbox.id)) as HTMLInputElement;
+    const converse = document.getElementById(converseId(checkbox.id)) as HTMLInputElement;
     converse.checked = false;
   }
   update();
@@ -81,10 +81,10 @@ function clear(e: Event) {
 function toggleSingles(e: Event) {
   showSingles = !showSingles;
 
-  let elems = Array.from(document.querySelectorAll('.filterlist li'));
-  for (let li of elems) {
-    let countStr = li.querySelector('label')?.dataset.count;
-    let count = countStr ? +countStr : 0;
+  const elems = Array.from(document.querySelectorAll('.filterlist li')) as HTMLElement[];
+  for (const li of elems) {
+    const countStr = li.querySelector('label')?.dataset.count;
+    const count = countStr ? +countStr : 0;
     if (count <= 1 && li instanceof HTMLElement) {
       li.hidden = !showSingles;
     }
@@ -95,8 +95,8 @@ function toggleSingles(e: Event) {
 
 
 function makeFragment() {
-  let allBoxesArr = Array.from(allBoxes);
-  let ids = allBoxesArr.filter(b => b.checked).map(b => b.id);
+  const allBoxesArr = Array.from(allBoxes);
+  const ids = allBoxesArr.filter(b => b.checked).map(b => b.id);
   if (ids.length == 0) {
     return '#all';
   } else if (allBoxesArr.every(b => b.checked == b.defaultChecked)) {
@@ -107,8 +107,8 @@ function makeFragment() {
 }
 
 function useFragment() {
-  let frag = decodeURIComponent(location.hash).replace(/^#/, '');
-  let details = document.getElementById('filters-details') as HTMLDetailsElement;
+  const frag = decodeURIComponent(location.hash).replace(/^#/, '');
+  const details = document.getElementById('filters-details') as HTMLDetailsElement;
 
   if (!frag) {
     clearForm();
@@ -116,8 +116,8 @@ function useFragment() {
     allBoxes.forEach(b => b.checked = false);
     details.open = false;
   } else {
-    let set = new Set(frag.split(';'));
-    let re = /^(require|exclude)_|hide_filters/;
+    const set = new Set(frag.split(';'));
+    const re = /^(require|exclude)_|hide_filters/;
     if (Array.from(set).every(x => re.test(x))) {
       allBoxes.forEach(b => b.checked = set.has(b.id));
       details.open = !frag.match(/hide_filters|example\b/);
@@ -130,12 +130,12 @@ function useFragment() {
 
 function sortFilters(cmp: (a: Node, b: Node) => number) {
   function sort1(id: string) {
-    let elt = document.getElementById(id);
+    const elt = document.getElementById(id);
     if (elt === null) return;
 
-    let children = Array.from(elt.childNodes);
+    const children = Array.from(elt.childNodes);
     children.sort(cmp);
-    for (let c of children) {
+    for (const c of children) {
       elt.removeChild(c);
       elt.appendChild(c);
     }
@@ -175,15 +175,15 @@ function sortFiltersUses(e: Event) {
 
 function setup() {
   function inputs(id: string): Boxes {
-    let iter = document.getElementById(id)!.getElementsByTagName('input');
+    const iter = document.getElementById(id)!.getElementsByTagName('input');
     return new Set(Array.from(iter));
   }
 
-  let items = Array.from(document.getElementsByClassName('post')) as HTMLElement[];
+  const items = Array.from(document.getElementsByClassName('post')) as HTMLElement[];
 
   itemsByYear = new Map;
-  for (let item of items) {
-    let year = item.dataset.year;
+  for (const item of items) {
+    const year = item.dataset.year;
     if (year !== undefined) {
       if (!itemsByYear.has(year)) {
         itemsByYear.set(year, new Set([item]));
diff --git a/script/nsfw-warning.ts b/script/nsfw-warning.ts
index ac901c5..fd1b369 100644
--- a/script/nsfw-warning.ts
+++ b/script/nsfw-warning.ts
@@ -5,7 +5,7 @@ function alreadyYes() {
 }
 
 function dismiss() {
-  let dialog = document.getElementById('nsfw-dialog')!;
+  const dialog = document.getElementById('nsfw-dialog')!;
   dialog.parentElement?.removeChild(dialog);
 }
 
diff --git a/script/single.ts b/script/single.ts
index 87195ae..2954f7d 100644
--- a/script/single.ts
+++ b/script/single.ts
@@ -4,7 +4,7 @@ let mainlink: HTMLAnchorElement;
 let altButtons: HTMLInputElement[];
 let skipAll: HTMLInputElement;
 
-let opened: Set<string> = new Set;
+const opened: Set<string> = new Set;
 
 function openCW(id: string | null, caption: HTMLElement | null,
                 focusLink = false) {
@@ -27,13 +27,11 @@ function setImage(id: string | null,
                   src: string,
                   href: string,
                   cw: string) {
-  let caption = document.getElementById('cw');
-  let newCaption: HTMLElement | null = null;
-
-  let checked = skipAll ? skipAll.checked : false;
+  const caption = document.getElementById('cw');
+  const checked = skipAll ? skipAll.checked : false;
 
   if (!checked && !opened.has(id) && cw) {
-    let template = document.getElementById('cw-template') as HTMLTemplateElement;
+    const template = document.getElementById('cw-template') as HTMLTemplateElement;
     newCaption = template.content.firstElementChild!.cloneNode(true) as HTMLElement;
     newCaption.querySelector('#cw-text')!.innerHTML = cw;
     addCWListeners(id, newCaption);
@@ -62,9 +60,9 @@ function activateButton(button: HTMLInputElement, doPush = true): void {
 function useFragment(firstLoad = false): void {
   let button = altButtons[0];
 
-  let frag = decodeURIComponent(location.hash).replace(/^#/, '');
+  const frag = decodeURIComponent(location.hash).replace(/^#/, '');
   if (frag) {
-    let selected = document.getElementById(frag) as HTMLInputElement;
+    const selected = document.getElementById(frag) as HTMLInputElement;
     if (selected) button = selected;
   }
 
@@ -85,21 +83,21 @@ function setup() {
   mainlink = document.getElementById('mainlink') as HTMLAnchorElement;
   skipAll  = document.getElementById('skipAll') as HTMLInputElement;
 
-  let alts = document.getElementById('alts');
+  const alts = document.getElementById('alts');
   if (alts) {
-    let inputs = Array.from(alts.getElementsByTagName('input'));
+    const inputs = Array.from(alts.getElementsByTagName('input'));
     altButtons = inputs.filter(e => e.name == 'variant');
   } else {
     altButtons = [];
   }
 
-  for (let button of altButtons) {
+  for (const button of altButtons) {
     button.onchange = _e => { if (button.checked) activateButton(button); };
   }
 
   if (skipAll) {
     skipAll.onchange = _e => { if (skipAll.checked) {
-      let caption = document.getElementById('cw');
+      const caption = document.getElementById('cw');
       if (caption) { openCW(null, caption, false); }
     } };
   }