Tweaked gitignore

gitignore removed all composer and npm files, so automated builds would fail

conf/site/node_modules/tiny-invariant/src/tiny-invariant.flow.js

@@ -0,0 +1,12 @@
+// @flow
+// This file is not actually executed
+// It is just used by flow for typing
+
+const prefix: string = 'Invariant failed';
+
+export default function invariant(condition: mixed, message?: string) {
+  if (condition) {
+    return;
+  }
+  throw new Error(`${prefix}: ${message || ''}`);
+}

conf/site/node_modules/tiny-invariant/src/tiny-invariant.ts

@@ -0,0 +1,25 @@
+// @flow
+const isProduction: boolean = process.env.NODE_ENV === 'production';
+const prefix: string = 'Invariant failed';
+
+// Throw an error if the condition fails
+// Strip out error messages for production
+// > Not providing an inline default argument for message as the result is smaller
+export default function invariant(
+  condition: any,
+  message?: string,
+): asserts condition {
+  if (condition) {
+    return;
+  }
+  // Condition not passed
+
+  // In production we strip the message but still throw
+  if (isProduction) {
+    throw new Error(prefix);
+  }
+
+  // When not in production we allow the message to pass through
+  // *This block will be removed in production builds*
+  throw new Error(`${prefix}: ${message || ''}`);
+}