Set up typescript project

.vscode/settings.json

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+{
+    "json.format.keepLines": true,
+    "typescript.format.semicolons": "insert",
+}

static/main.ts

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+function main() {
+    alert("Hello world!");
+}
+
+main();

tsconfig.json

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+{ // See also https://aka.ms/tsconfig
+  "include": [ "static/**/*" ],
+
+  "compilerOptions": {
+    "target": "ES2015",
+    "module": "ES2015",
+    "rootDir": "static",
+    "outDir": "target/static",
+
+    // Misc
+    // TODO Source maps?
+    "forceConsistentCasingInFileNames": true,
+    "newLine": "lf",
+    "removeComments": true,
+
+    // Type checking
+    "noFallthroughCasesInSwitch": true,
+    "noImplicitOverride": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noUncheckedIndexedAccess": true,
+    "strict": true,
+  }
+}