Update typescript to 4.2.3

Author: simnalamburt

package.json

@@ -1,5 +1,5 @@
 {
   "devDependencies": {
-    "typescript": "^3.0.3"
+    "typescript": "^4"
   }
 }

src/main.ts

@@ -21,7 +21,7 @@ images[pos].classList.add('visible')
 images[pos].classList.add('top')
 
 const delay = 6000
-setInterval(_ => {
+setInterval(() => {
   const lastPos = pos
   pos = (pos + 1) % images.length
 
@@ -31,12 +31,12 @@ setInterval(_ => {
   images[pos].classList.add('top')
 
   // Hide last image after a short delay.
-  setTimeout(_ => {
+  setTimeout(() => {
     images[lastPos].classList.remove('visible')
   }, delay / 2)
 }, delay)
 
 // Play initial animations on page load.
-setTimeout(_ => {
+setTimeout(() => {
   document.body.classList.remove('is-preload')
 }, 100)

yarn.lock

@@ -2,6 +2,7 @@
 # yarn lockfile v1
 
 
-typescript@^3.0.3:
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.0.3.tgz#4853b3e275ecdaa27f78fda46dc273a7eb7fc1c8"
+typescript@^4:
+  version "4.2.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.2.3.tgz#39062d8019912d43726298f09493d598048c1ce3"
+  integrity sha512-qOcYwxaByStAWrBf4x0fibwZvMRG+r4cQoTjbPtUlrWjBHbmCAww1i448U0GJ+3cNNEtebDteo/cHOR3xJ4wEw==