Require path context to be set on 'context' subkey

lib/utils/query-runner.js

@@ -302,13 +302,23 @@ const q = queue(({ file, graphql, directory }, callback) => {
   // Run queries for each page component.
   console.time(`graphql query time`)
   Promise.all(paths.map((pathInfo) => {
-    return graphql(query, pathInfo)
+    let pathContext
+    // Mixin the path context to the top-level.
+    // TODO do runtime check that user not passing in key that conflicts
+    // w/ top-level keys e.g. path or component.
+    if (pathInfo.context) {
+      pathContext = { ...pathInfo, ...pathInfo.context }
+    } else {
+      pathContext = { ...pathInfo }
+    }
+    return graphql(query, pathContext)
     .catch(error => console.log(`graphql error`, error))
     .then(result => {
       if (result.errors) {
         console.log(`graphql errors`, result.errors)
       }
-      // Combine the result with the pathInfo.
+      // Combine the result with the path context.
+      result.pathContext = pathInfo.context
       const clonedResult = { ...result }
       result.pathContext = pathInfo