Pull forward the lint changes from #275

addon/.eslintrc.cjs

@@ -7,15 +7,21 @@ module.exports = {
     {
       files: ['src/**/*.{js,ts}'],
       parser: '@typescript-eslint/parser',
-      plugins: ['ember'],
+      plugins: ['ember', '@typescript-eslint'],
       extends: [
         'eslint:recommended',
+        'plugin:@typescript-eslint/recommended',
         'plugin:ember/recommended',
         'plugin:prettier/recommended',
       ],
       env: {
         browser: true,
       },
+      rules: {
+        // temp, remove these in #275
+        '@typescript-eslint/ban-ts-comment': 'off',
+        'prefer-rest-params': 'off',
+      },
     },
     // node files
     {

addon/src/helpers/page-title.ts

@@ -44,7 +44,7 @@ export default class PageTitle extends Helper<Signature> {
   }
 
   compute(params, _hash) {
-    let hash = {
+    const hash = {
       ..._hash,
       id: this.tokenId,
       title: params.join(''),

addon/src/services/page-title.ts

@@ -6,7 +6,7 @@ import { isEmpty } from '@ember/utils';
 import { assert } from '@ember/debug';
 import type RouterService from '@ember/routing/router-service';
 
-let isFastBoot = typeof FastBoot !== 'undefined';
+const isFastBoot = typeof FastBoot !== 'undefined';
 
 const RouterEvent = {
   ROUTE_DID_CHANGE: 'routeDidChange',
@@ -62,7 +62,7 @@ export default class PageTitleService extends Service {
     super(...arguments);
     this._validateExistingTitleElement();
 
-    let config = getOwner(this).resolveRegistration('config:environment');
+    const config = getOwner(this).resolveRegistration('config:environment');
     if (config.pageTitle) {
       ['separator', 'prepend', 'replace'].forEach((key) => {
         if (!isEmpty(config.pageTitle[key])) {
@@ -74,9 +74,9 @@ export default class PageTitleService extends Service {
   }
 
   applyTokenDefaults(token) {
-    let defaultSeparator = this._defaultConfig.separator;
-    let defaultPrepend = this._defaultConfig.prepend;
-    let defaultReplace = this._defaultConfig.replace;
+    const defaultSeparator = this._defaultConfig.separator;
+    const defaultPrepend = this._defaultConfig.prepend;
+    const defaultReplace = this._defaultConfig.replace;
 
     token.previous ??= null;
     token.next ??= null;
@@ -95,7 +95,7 @@ export default class PageTitleService extends Service {
   }
 
   inheritFromPrevious(token) {
-    let previous = token.previous;
+    const previous = token.previous;
     if (previous) {
       if (token.separator == null) {
         token.separator = previous.separator;
@@ -108,11 +108,11 @@ export default class PageTitleService extends Service {
   }
 
   push(token) {
-    let tokenForId = this._findTokenById(token.id);
+    const tokenForId = this._findTokenById(token.id);
     if (tokenForId) {
-      let index = this.tokens.indexOf(tokenForId);
-      let tokens = [...this.tokens];
-      let previous = tokenForId.previous;
+      const index = this.tokens.indexOf(tokenForId);
+      const tokens = [...this.tokens];
+      const previous = tokenForId.previous;
       token.previous = previous;
       token.next = tokenForId.next;
       this.inheritFromPrevious(token);
@@ -123,7 +123,7 @@ export default class PageTitleService extends Service {
       return;
     }
 
-    let previous = this.tokens.slice(-1)[0];
+    const previous = this.tokens.slice(-1)[0];
     if (previous) {
       token.previous = previous ?? null;
       previous.next = token;
@@ -135,8 +135,8 @@ export default class PageTitleService extends Service {
   }
 
   remove(id) {
-    let token = this._findTokenById(id);
-    let { next, previous } = token;
+    const token = this._findTokenById(id);
+    const { next, previous } = token;
     if (next) {
       next.previous = previous;
     }
@@ -147,17 +147,17 @@ export default class PageTitleService extends Service {
 
     token.previous = token.next = null;
 
-    let tokens = [...this.tokens];
+    const tokens = [...this.tokens];
     tokens.splice(tokens.indexOf(token), 1);
     this.tokens = tokens;
   }
 
   get visibleTokens() {
-    let tokens = this.tokens;
+    const tokens = this.tokens;
     let i = tokens ? tokens.length : 0;
-    let visible = [];
+    const visible = [];
     while (i--) {
-      let token = tokens[i];
+      const token = tokens[i];
       if (token.replace) {
         visible.unshift(token);
         break;
@@ -169,11 +169,11 @@ export default class PageTitleService extends Service {
   }
 
   get sortedTokens() {
-    let visible = this.visibleTokens;
+    const visible = this.visibleTokens;
     let appending = true;
     let group = [];
-    let groups = [group];
-    let frontGroups = [];
+    const groups = [group];
+    const frontGroups = [];
     visible.forEach((token) => {
       if (token.front) {
         frontGroups.unshift(token);
@@ -183,7 +183,7 @@ export default class PageTitleService extends Service {
           group = [];
           groups.push(group);
         }
-        let lastToken = group[0];
+        const lastToken = group[0];
         if (lastToken) {
           token = { ...token };
           token.separator = lastToken.separator;
@@ -207,10 +207,10 @@ export default class PageTitleService extends Service {
   };
 
   toString() {
-    let tokens = this.sortedTokens;
-    let title = [];
+    const tokens = this.sortedTokens;
+    const title = [];
     for (let i = 0, len = tokens.length; i < len; i++) {
-      let token = tokens[i];
+      const token = tokens[i];
       if (token.title) {
         title.push(token.title);
         if (i + 1 < len) {
@@ -282,15 +282,15 @@ export default class PageTitleService extends Service {
 
     // Remove existing title elements from previous render cycle
     for (let i = 0; i < headChildNodes.length; i++) {
-      let node = headChildNodes[i];
+      const node = headChildNodes[i];
       if (node.nodeName.toLowerCase() === 'title') {
         headElement.removeChild(node);
       }
     }
 
     // Add title element with latest value
-    let titleEl = this.document.createElement('title');
-    let titleContents = this.document.createTextNode(toBeTitle);
+    const titleEl = this.document.createElement('title');
+    const titleContents = this.document.createTextNode(toBeTitle);
     titleEl.appendChild(titleContents);
     headElement.appendChild(titleEl);
   }

addon/src/test-support/get-page-title.ts

@@ -5,7 +5,7 @@ export function getPageTitle(doc: Document) {
   // In Fastboot context we get 2 title elements if we don't remove one from app/index.html
   // In real world applications, it is mandatory to remove <title> from app/index.html
   // We are keeping both for sake for testing browser and fastboot scenarios
-  let element = [
+  const element = [
     ...(doc || window.document).querySelectorAll('head title'),
   ].pop();