Begin refactoring to TypeScript

package-lock.json

@@ -26,6 +26,107 @@
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       }
     },
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+      "dev": true,
+      "requires": {
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+    "@types/suncalc": {
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@@ -5755,6 +5856,12 @@
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+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.4.5.tgz",
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       "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.3.5.tgz",