Converted example to ReScript and added NodeJs module accessors (sikanhe/reason-nodejs#43)

Author: TheSpyder

examples/StreamTextToFile.re

@@ -0,0 +1,27 @@
+// Normally `open NodeJs` would be used to shorten the module accessors
+// this is not done in the example to make it clear where things come from
+
+let data = "Sample text to write to a file!"->NodeJs.Buffer.fromString
+let process = NodeJs.Process.process
+
+let outputPath = NodeJs.Path.relative(~from=NodeJs.Process.cwd(process), ~to_="example__output.txt")
+
+let writeStream = NodeJs.Fs.createWriteStream(outputPath)
+
+let logErrorIfExists = maybeError =>
+  switch Js.Nullable.toOption(maybeError) {
+  | Some(err) => Js.log2("An error occurred", err)
+  | None => ()
+  }
+
+let () =
+  writeStream
+  ->NodeJs.Stream.writeWith(
+    data,
+    ~callback=maybeError => {
+      logErrorIfExists(maybeError)
+      Js.log("Finished")
+    },
+    (),
+  )
+  ->ignore