diff --git a/gdn-app/eslint.config.js b/gdn-app/eslint.config.js
index eaecbff..ac54ec1 100644
--- a/gdn-app/eslint.config.js
+++ b/gdn-app/eslint.config.js
@@ -34,4 +34,19 @@ export default tseslint.config(
 
   // Tell the vue parser that it should use the ts parser instead of the js parser.
   { files: ["**/*.vue"], languageOptions: { parserOptions: { parser: tseslint.parser } } },
+
+  // My own rules.
+  //
+  // https://eslint.org/docs/latest/rules/
+  // https://typescript-eslint.io/rules/
+  // https://eslint.vuejs.org/rules/
+  {
+    rules: {
+      "@typescript-eslint/explicit-function-return-type": "error",
+      "vue/block-lang": ["error", { script: { lang: "ts" } }],
+      "vue/block-order": ["error", { order: ["script", "template", "style"] }],
+      "vue/component-api-style": ["error", ["script-setup"]],
+      "vue/v-for-delimiter-style": ["error", "of"],
+    },
+  },
 );
diff --git a/gdn-app/src/components/CNavbar.vue b/gdn-app/src/components/CNavbar.vue
index 8d64965..3de2de8 100644
--- a/gdn-app/src/components/CNavbar.vue
+++ b/gdn-app/src/components/CNavbar.vue
@@ -17,7 +17,7 @@ function mkNote(text: string, ...children: string[]): Note {
   return note;
 }
 
-function createSomeNotes() {
+function createSomeNotes(): void {
   notes.clearNotes();
 
   const n2n1 = mkNote("n2n1");
diff --git a/gdn-app/src/components/CNavbarDropdown.vue b/gdn-app/src/components/CNavbarDropdown.vue
index e3eb6fe..a33bbba 100644
--- a/gdn-app/src/components/CNavbarDropdown.vue
+++ b/gdn-app/src/components/CNavbarDropdown.vue
@@ -25,14 +25,14 @@ const { floatingStyles } = useFloating(reference, floating, {
   ],
 });
 
-function onAddNewRepo() {
+function onAddNewRepo(): void {
   const id = crypto.randomUUID();
   repos.addRepo({ id, name: id });
   console.log(repos.selectedRepo);
   open.value = false;
 }
 
-function onSelectRepo(id: string) {
+function onSelectRepo(id: string): void {
   repos.selectRepo(id);
   open.value = false;
 }
diff --git a/gdn-app/src/components/CNote.vue b/gdn-app/src/components/CNote.vue
index f561d67..152523d 100644
--- a/gdn-app/src/components/CNote.vue
+++ b/gdn-app/src/components/CNote.vue
@@ -76,11 +76,11 @@ watchEffect(() => {
   if (mode.value) focusOnThis();
 });
 
-function focusOnThis() {
+function focusOnThis(): void {
   ui.focusPath = props.path;
 }
 
-function onClick() {
+function onClick(): void {
   if (!focused.value) {
     focusOnThis();
     return;
@@ -89,36 +89,36 @@ function onClick() {
   ui.toggleOpen(props.path);
 }
 
-function onPinButtonClick() {
+function onPinButtonClick(): void {
   if (pinned.value) ui.unsetPinned();
   else ui.setPinned(props.segment, props.parentId);
 }
 
-function onEditButtonClick() {
+function onEditButtonClick(): void {
   if (!note.value) return;
   mode.value = "editing";
 }
 
-function onEditEditorClose() {
+function onEditEditorClose(): void {
   mode.value = undefined;
 }
 
-function onEditEditorFinish(text: string) {
+function onEditEditorFinish(text: string): void {
   if (!note.value) return;
   note.value.text = text;
   onEditEditorClose();
 }
 
-function onCreateButtonClick() {
+function onCreateButtonClick(): void {
   if (!note.value) return;
   mode.value = "creating";
 }
 
-function onCreateEditorClose() {
+function onCreateEditorClose(): void {
   mode.value = undefined;
 }
 
-function onCreateEditorFinish(text: string) {
+function onCreateEditorFinish(text: string): void {
   if (!note.value) return;
 
   const newNote = notes.createNote(text);
diff --git a/gdn-app/src/components/CNoteEditor.vue b/gdn-app/src/components/CNoteEditor.vue
index 80a8d8c..fd88987 100644
--- a/gdn-app/src/components/CNoteEditor.vue
+++ b/gdn-app/src/components/CNoteEditor.vue
@@ -20,17 +20,17 @@ onMounted(() => {
   updateTextareaHeight();
 });
 
-function updateTextareaHeight() {
+function updateTextareaHeight(): void {
   if (!textarea.value) return;
   textarea.value.style.height = "0px";
   textarea.value.style.height = `${textarea.value.scrollHeight.toFixed()}px`;
 }
 
-function onInput() {
+function onInput(): void {
   updateTextareaHeight();
 }
 
-function onKeyPress(ev: KeyboardEvent) {
+function onKeyPress(ev: KeyboardEvent): void {
   if (ev.key === "Escape") {
     emit("close");
   } else if (ev.key === "Enter" && !ev.shiftKey) {
diff --git a/gdn-app/src/stores/notes.ts b/gdn-app/src/stores/notes.ts
index aee1c78..8896393 100644
--- a/gdn-app/src/stores/notes.ts
+++ b/gdn-app/src/stores/notes.ts
@@ -37,7 +37,7 @@ export const useNotesStore = defineStore("notes", () => {
     return notes.value.get(id)!; // Re-getting so returned Note is reactive
   }
 
-  function clearNotes() {
+  function clearNotes(): void {
     notes.value.clear();
   }
 
diff --git a/gdn-app/src/stores/repos.ts b/gdn-app/src/stores/repos.ts
index 60786b1..ca6fed4 100644
--- a/gdn-app/src/stores/repos.ts
+++ b/gdn-app/src/stores/repos.ts
@@ -23,12 +23,12 @@ export const useReposStore = defineStore("repos", () => {
 
   const repoIdsByName = computed<string[]>(() => reposByName.value.map((it) => it.id));
 
-  function addRepo(repo: Repo) {
+  function addRepo(repo: Repo): void {
     repos.value.set(repo.id, repo);
     selectedRepoId.value = repo.id;
   }
 
-  function removeRepo(id: string | undefined) {
+  function removeRepo(id: string | undefined): void {
     if (id === undefined) return;
     const i = repoIdsByName.value.indexOf(id);
     repos.value.delete(id);
@@ -38,7 +38,7 @@ export const useReposStore = defineStore("repos", () => {
     }
   }
 
-  function selectRepo(id: string | undefined) {
+  function selectRepo(id: string | undefined): void {
     if (id === undefined) return;
     if (repos.value.get(id) === undefined) return;
     selectedRepoId.value = id;
diff --git a/gdn-app/src/stores/ui.ts b/gdn-app/src/stores/ui.ts
index 12c15e2..b4ce770 100644
--- a/gdn-app/src/stores/ui.ts
+++ b/gdn-app/src/stores/ui.ts
@@ -20,7 +20,7 @@ export const useUiStore = defineStore("ui", () => {
     return openPaths.value.has(path.fmt());
   }
 
-  function setOpen(path: UiPath, value: boolean) {
+  function setOpen(path: UiPath, value: boolean): void {
     // Don't update openPaths unnecessarily.
     // Just in case vue itself doesn't debounce Set operations.
     if (value && !isOpen(path)) {
@@ -33,7 +33,7 @@ export const useUiStore = defineStore("ui", () => {
     }
   }
 
-  function toggleOpen(path: UiPath) {
+  function toggleOpen(path: UiPath): void {
     setOpen(path, !isOpen(path));
   }
 
@@ -42,11 +42,11 @@ export const useUiStore = defineStore("ui", () => {
     return pinned.value.segment.eq(segment) && pinned.value.parentId === parentId;
   }
 
-  function setPinned(segment: Segment, parentId?: string) {
+  function setPinned(segment: Segment, parentId?: string): void {
     pinned.value = { segment, parentId };
   }
 
-  function unsetPinned() {
+  function unsetPinned(): void {
     pinned.value = undefined;
   }