support/v3-cleanup (#2450)

* support/cleanup removal of unused js files + linting

* fix flow

scripts/v3clean.js

@@ -0,0 +1,56 @@
+const { rm } = require("fs");
+
+const exec = require("child_process").exec;
+
+/* eslint-disable no-console */
+
+async function executeAsync(command) {
+  return new Promise((resolve, reject) => {
+    exec(command, (error, stdout, stderr) => {
+      if (error) {
+        reject(error);
+      } else if (stderr) {
+        reject(stderr);
+      } else {
+        resolve(stdout);
+      }
+    });
+  });
+}
+
+async function listTsJsFilesPairs() {
+  const jsFilesPath = {};
+  const jsTsPairs = [];
+  await executeAsync('git ls-files | grep -e ".\\.js$"').then(res =>
+    res.split("\n").map(path => (jsFilesPath[path] = true)),
+  );
+  return executeAsync('git ls-files | grep -e ".\\.ts$" -e ".\\.tsx$"')
+    .then(res =>
+      res.split("\n").forEach(path => {
+        const beforeExtensionPath = path
+          .split(".")
+          .slice(0, -1)
+          .join(".");
+        const jsFilePath = `${beforeExtensionPath}.js`;
+        if (jsFilesPath[jsFilePath]) {
+          jsTsPairs.push({
+            tsFilePath: path,
+            jsFilePath,
+          });
+        }
+      }),
+    )
+    .then(() => jsTsPairs);
+}
+
+async function removeJS() {
+  const pairs = await listTsJsFilesPairs();
+
+  pairs.forEach(({ jsFilePath }) => {
+    rm(jsFilePath);
+  });
+
+  return true;
+}
+
+removeJS().then(() => console.log("JS files removed"));

src/analytics/TrackScreen.tsx

@@ -1,4 +1,3 @@
-// @flow
 import { useEffect, useRef } from "react";
 import { useIsFocused } from "@react-navigation/native";
 import { screen } from "./segment";