Fix various linter errors, ignore third_party, enable linter in PR builds

.github/workflows/lint.yml

@@ -0,0 +1,18 @@
+name: Lint
+
+on: [pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [18.x]
+    steps:
+    - uses: actions/checkout@v3
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v3
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: yarn install
+    - run: yarn lint

package.json

@@ -26,7 +26,7 @@
     "test": "ava -v",
     "pre~rollup": "npm-run-all --parallel tsc:worker tsc:main",
     "~rollup": "rollup --config config/rollup.config.mjs",
-    "lint:worker": "tslint -c config/tslint.json -p src/worker-thread/",
+    "lint:worker": "tslint -c config/tslint.json -p src/worker-thread/ -e '**/third_party/**'",
     "lint:main": "tslint -c config/tslint.json -p src/main-thread/",
     "lint": "npm-run-all --parallel lint:*",
     "predemo": "cross-env DEBUG_BUNDLE=true npm-run-all ~rollup",

src/worker-thread/AnimationFrame.ts

@@ -7,7 +7,7 @@ interface Queued {
 const frameDuration = 1000 / 60;
 let last: number = 0;
 let id: number = 0;
-let queue: Array<Queued> = [];
+const queue: Array<Queued> = [];
 
 /**
  * Schedules the accumulated callbacks to be fired 16ms after the last round.
@@ -18,12 +18,12 @@ function scheduleNext() {
   last = now + next;
 
   setTimeout(function () {
-    var cp = queue.slice(0);
+    const cp = queue.slice(0);
     // Clear queue here to prevent
     // callbacks from appending listeners
     // to the current frame's queue
     queue.length = 0;
-    for (var i = 0; i < cp.length; i++) {
+    for (let i = 0; i < cp.length; i++) {
       if (cp[i].cancelled) {
         continue;
       }

src/worker-thread/dom/elementSibling.ts

@@ -3,13 +3,13 @@ import { Element } from './Element.js';
 import { Node } from './Node.js';
 
 export function getPreviousElementSibling(node: Node): Element | null {
-  let parentNodes = node.parentNode && node.parentNode.childNodes;
+  const parentNodes = node.parentNode && node.parentNode.childNodes;
   if (!parentNodes) {
     return null;
   }
 
   for (let i = parentNodes.indexOf(node) - 1; i >= 0; i--) {
-    let node = parentNodes[i];
+    const node = parentNodes[i];
     if (node.nodeType === NodeType.ELEMENT_NODE) {
       return node as Element;
     }
@@ -18,13 +18,13 @@ export function getPreviousElementSibling(node: Node): Element | null {
 }
 
 export function getNextElementSibling(node: Node): Element | null {
-  let parentNodes = node.parentNode && node.parentNode.childNodes;
+  const parentNodes = node.parentNode && node.parentNode.childNodes;
   if (!parentNodes) {
     return null;
   }
 
   for (let i = parentNodes.indexOf(node) + 1; i < parentNodes.length; i++) {
-    let node = parentNodes[i];
+    const node = parentNodes[i];
     if (node.nodeType === NodeType.ELEMENT_NODE) {
       return node as Element;
     }

src/worker-thread/index.nodom.amp.ts

@@ -31,11 +31,11 @@ addEventListener('message', (evt: MessageEvent) => callFunctionMessageHandler(ev
 
 export const hydrate: HydrateFunction = (
   document: DocumentStub,
-  strings: Object,
-  hydrateableNode: Object,
-  cssKeys: Object,
-  globalEventHandlerKeys: Object,
-  size: Object,
+  strings: {},
+  hydrateableNode: {},
+  cssKeys: {},
+  globalEventHandlerKeys: {},
+  size: {},
   localStorageInit: WorkerStorageInit,
   sessionStorageInit: WorkerStorageInit,
 ) => {