Switched to Rollup; Used deftype definitions

.prettierrc.json

@@ -0,0 +1,8 @@
+{
+    "jsxBracketSameLine": true,
+    "semi": false,
+    "singleQuote": true,
+    "trailingComma": "none",
+    "endOfLine": "auto",
+    "printWidth": 120
+  }

MMM-RAIN-MAP.css

@@ -1,46 +1,46 @@
 .rain-map-time-wrapper {
-	--color-history: #003AFF;
-	--color-now: #000;
-	--color-forecast: #ff0074;
-	position: absolute;
-	display: block;
-	background: #ccc;
-	padding: 0 10px 0 10px;
-	z-index: 999;
-	opacity: 0.75;
-	color: #000;
-	font-size: 1.2rem;
+  --color-history: #003aff;
+  --color-now: #000;
+  --color-forecast: #ff0074;
+  position: absolute;
+  display: block;
+  background: #ccc;
+  padding: 0 10px 0 10px;
+  z-index: 999;
+  opacity: 0.75;
+  color: #000;
+  font-size: 1.2rem;
 }
 .rain-map-time-wrapper i {
-	margin-right: 6px;
+  margin-right: 6px;
 }
 
 .rain-map-timeslider {
-	width: 0;
-	height: 0;
-	margin-top: -8px;
-	margin-left: -2px;
-	border-left: 4px solid transparent;
-	border-right: 4px solid transparent;
-	border-top: 10px solid #000;
-	position: relative;
-	display: block;
+  width: 0;
+  height: 0;
+  margin-top: -8px;
+  margin-left: -2px;
+  border-left: 4px solid transparent;
+  border-right: 4px solid transparent;
+  border-top: 10px solid #000;
+  position: relative;
+  display: block;
 }
 
 .rain-map-timeline {
-	display: block;
-	height: 4px;
-	margin-bottom: 5px;
+  display: block;
+  height: 4px;
+  margin-bottom: 5px;
 }
 
 .rain-map-time.rain-map-history {
-	color: var(--color-history);
+  color: var(--color-history);
 }
 
 .rain-map-time.rain-map-now {
-	color: var(--color-now);
+  color: var(--color-now);
 }
 
 .rain-map-time.rain-map-forecast {
-	color: var(--color-forecast);
+  color: var(--color-forecast);
 }

README.md

@@ -24,7 +24,7 @@ https://user-images.githubusercontent.com/25933231/130909536-e096d342-19d5-4139-
 
 ## Installing the Module
 
-1. Navigate to the MagicMirror subfolder "modules" and execute the following command
+1. Navigate to the MagicMirror's subfolder "modules" and execute the following command
 
 	```sh
 	git clone https://github.com/jalibu/MMM-RAIN-MAP.git
@@ -109,6 +109,14 @@ https://user-images.githubusercontent.com/25933231/130909536-e096d342-19d5-4139-
 | `zoom`  | Either set a zoom level or defaultZoomLevel is used.<br><br>**Range:** `0 (whole world) - 20 (small building)`<br>**Type:** `number` |
 | `loops`  | Number of loops/iterations until the map moves to the next position. If no number is set, a value of `1` is used.<br><br>**Type:** `number` |
 
+
+## Contribution and Development
+This module is written in TypeScript and compiled with Rollup.  
+The source files are located in the `/src` folder.
+Compile target files with `npm run build`.
+
+Contribution for this module is welcome!
+
 ## Thanks to
 
 - Thanks to all supporters who gave a small [donation](https://www.buymeacoffee.com/jalibu) out of gratitude for my work.