From eb735a0dde5b30f39cbc7e36953492f2b04af2ed Mon Sep 17 00:00:00 2001
From: Dustan Kasten <dkasten@walmartlabs.com>
Date: Mon, 9 May 2016 14:44:51 -0400
Subject: [PATCH] build step: output flow declaration files. Closes
 electrode/proposals#9

---
 .../scripts/copy-as-flow-declaration.js       | 62 +++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 packages/electrode-archetype-react-component/scripts/copy-as-flow-declaration.js

diff --git a/packages/electrode-archetype-react-component/scripts/copy-as-flow-declaration.js b/packages/electrode-archetype-react-component/scripts/copy-as-flow-declaration.js
new file mode 100644
index 000000000..27a7457ea
--- /dev/null
+++ b/packages/electrode-archetype-react-component/scripts/copy-as-flow-declaration.js
@@ -0,0 +1,62 @@
+"use strict";
+/**
+ * Support outputting Flow annotated files in node_modules wiht flow declaration
+ * files as documented in http://flowtype.org/blog/2015/12/01/Version-0.19.0.html
+ *
+ * Searches all .js|.jsx files in `src` and if it contains a `@flow` pragma,
+ * will copy the original contents out to `lib/{file}.js.flow` accordingly.
+ */
+
+const IS_VERBOSE = process.argv.some((arg) => arg === "--verbose" || arg === "-v");
+const fs = require("fs");
+const path = require("path");
+const cwd = process.cwd();
+const input = path.join(cwd, "src");
+
+/* eslint-disable */
+// disable eslint because:
+// * it is configured to prefer (...args) over apply, but that is not supported
+//   in node v4
+// * `console` is disallowed, but we're logging.
+function log() {
+  if (IS_VERBOSE) {
+    console.log.apply(console, arguments);
+  }
+}
+/* eslint-enable */
+
+const copyFile = (dir, filename) => {
+  const stream = fs.createReadStream(path.join(dir, filename));
+  const destPath = path.join(dir.replace("src", "lib"), filename.replace(/x$/, ""));
+  const dest = `${destPath}.flow`;
+  log("Copying %s to %s", dir.replace(cwd, ".") + path.sep + filename, dest.replace(cwd, "."));
+  stream.pipe(fs.createWriteStream(dest));
+};
+
+const handleFile = (dir) => (filename) => {
+  const file = path.join(dir, filename);
+  fs.stat(file, (err, stats) => {
+    if (err) {
+      throw err;
+    }
+
+    if (stats.isDirectory()) {
+      // handleFile recusively calls copyDir
+      copyDir(path.join(dir, filename)); // eslint-disable-line no-use-before-define
+    } else if (stats.isFile() && /\.jsx?$/.test(filename)) {
+      copyFile(dir, filename);
+    }
+  });
+};
+
+const copyDir = (dir) => {
+  fs.readdir(dir, (err, data) => {
+    if (err) {
+      throw err;
+    }
+    data.forEach(handleFile(dir));
+  });
+};
+
+copyDir(input);
+