Use tsconfig file

package.json

@@ -10,7 +10,7 @@
     "start": "parcel index.html",
     "build": "parcel build index.html --no-source-maps",
     "prebuild": "yarn run typecheck",
-    "typecheck": "tsc --noEmit src/saimiar_morphology.ts"
+    "typecheck": "tsc --noEmit"
   },
   "devDependencies": {
     "@parcel/transformer-image": "2.0.0-rc.0",

tsconfig.json

@@ -0,0 +1,4 @@
+{
+"compilerOptions": {},
+"include": ["src/**/*"]
+}