Use library to create temporary files

Summary: Makes the code a bit cleaner and maintainable.

Reviewed By: passy

Differential Revision: D9496316

fbshipit-source-id: a59a41b12a57bb2eedc25b154c6f9b0cdc77dd8a

flow-typed/npm/tmp_vx.x.x.js

@@ -0,0 +1,32 @@
+// flow-typed signature: 5764ce2922249ed6bf930c177a5582d4
+// flow-typed version: <<STUB>>/tmp_v0.0.33/flow_v0.76.0
+
+/**
+ * This is an autogenerated libdef stub for:
+ *
+ *   'tmp'
+ *
+ * Fill this stub out by replacing all the `any` types.
+ *
+ * Once filled out, we encourage you to share your work with the
+ * community by sending a pull request to:
+ * https://github.com/flowtype/flow-typed
+ */
+
+declare module 'tmp' {
+  declare module.exports: any;
+}
+
+/**
+ * We include stubs for each file inside this npm package in case you need to
+ * require those files directly. Feel free to delete any files that aren't
+ * needed.
+ */
+declare module 'tmp/lib/tmp' {
+  declare module.exports: any;
+}
+
+// Filename aliases
+declare module 'tmp/lib/tmp.js' {
+  declare module.exports: $Exports<'tmp/lib/tmp'>;
+}