Merge pull request #93 from launchdarkly/eb/valid-flag

add check for $valid property

Author: eli-darkly

src/index.js

@@ -41,13 +41,17 @@ export function initialize(env, user, options = {}) {
     // the rest of the metadata we want. We do it this way for backward compatibility with older JS SDKs.
     const keys = Object.keys(data);
     const metadataKey = '$flagsState';
+    const validKey = '$valid';
     const metadata = data[metadataKey];
     if (!metadata && keys.length) {
       console.warn(messages.bootstrapOldFormat());
     }
+    if (data[validKey] === false) {
+      console.warn(messages.bootstrapInvalid());
+    }
     const ret = {};
     keys.forEach(key => {
-      if (key !== metadataKey) {
+      if (key !== metadataKey && key !== validKey) {
         let flag = { value: data[key] };
         if (metadata && metadata[key]) {
           flag = utils.extend(flag, metadata[key]);

src/messages.js

@@ -45,6 +45,10 @@ export const bootstrapOldFormat = function() {
   );
 };
 
+export const bootstrapInvalid = function() {
+  return 'LaunchDarkly bootstrap data is not available because the back end could not read the flags.';
+};
+
 export const deprecated = function(oldName, newName) {
   return '[LaunchDarkly] "' + oldName + '" is deprecated, please use "' + newName + '"';
 };