ref(ts): Convert utils/convertFromSelect2Choices to typescript (#21005)

Author: billyvg

src/sentry/static/sentry/app/utils/convertFromSelect2Choices.jsx

@@ -0,0 +1,23 @@
+import {SelectValue} from 'app/types';
+
+type Choices = Array<string | [value: string, label: string]>;
+
+/**
+ * Converts arg from a `select2` choices array to a `react-select` `options` array
+ */
+const convertFromSelect2Choices = (choices: Choices): SelectValue<any>[] | null => {
+  // TODO(ts): This is to make sure that this function is backwards compatible, ideally,
+  // this function only accepts arrays
+  if (!Array.isArray(choices)) {
+    return null;
+  }
+
+  // Accepts an array of strings or an array of tuples
+  return choices.map(choice =>
+    Array.isArray(choice)
+      ? {value: choice[0], label: choice[1]}
+      : {value: choice, label: choice}
+  );
+};
+
+export default convertFromSelect2Choices;