Add defaultExpanded prop

src/defaultProps.js

@@ -22,6 +22,7 @@ export default {
   defaultSorting: [],
   showFilters: false,
   defaultFilters: [],
+  defaultExpanded: {},
   defaultFilterMethod: (filter, row, column) => {
     const id = filter.pivotId || filter.id
     return row[id] !== undefined ? String(row[id]).startsWith(filter.value) : true

src/index.js

@@ -33,9 +33,9 @@ export default class ReactTable extends Methods(Lifecycle(Component)) {
 
     this.state = {
       page: 0,
-      pageSize: props.defaultPageSize || 10,
+      pageSize: props.defaultPageSize,
       sorting: props.defaultSorting,
-      expandedRows: {},
+      expandedRows: props.defaultExpanded,
       filters: props.defaultFilters,
       resizing: props.defaultResizing,
       currentlyResizing: false,