Ts all the tests (#1998)

* Convert tests to TypeScript

* Add types for tests

* Rename files to TS

* Fix up test imports

* Fix TSC errors

* Liiiint

* Add types to util method signatures

* Some more types

src/common/util/parse-aspect-ratio.ts

@@ -0,0 +1,26 @@
+export default function parseAspectRatio(input) {
+  // Handle 16x9, 16:9, 1.78x1, 1.78:1, 1.78
+  // Ignore everything else
+  function parseOrThrow(num) {
+    const parsed = parseFloat(num);
+    if (isNaN(parsed)) {
+      throw new Error(`${num} is not a number`);
+    }
+    return parsed;
+  }
+  try {
+    if (input) {
+      const arr = input.replace(":", "x").split("x");
+      if (arr.length === 0) {
+        return null;
+      }
+
+      return arr.length === 1
+        ? { w: parseOrThrow(arr[0]), h: 1 }
+        : { w: parseOrThrow(arr[0]), h: parseOrThrow(arr[1]) };
+    }
+  } catch (err) {
+    // Ignore the error
+  }
+  return null;
+}