Add immutable state for readme/summary

Add shapes for these states

1 files changed, 13 insertions, 0 deletions

diff --git a/packages/gitbook-core/src/shapes/Summary.js b/packages/gitbook-core/src/shapes/Summary.js
new file mode 100644
index 0000000..7efe4e0
--- /dev/null
+++ b/packages/gitbook-core/src/shapes/Summary.js
@@ -0,0 +1,13 @@
+const React  = require('react');
+const {
+    arrayOf,
+    shape
+} = React.PropTypes;
+
+const File = require('./File');
+const Part = require('./SummaryPart');
+
+module.exports = shape({
+    file:  File.isRequired,
+    parts: arrayOf(Part).isRequired
+});