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app/components/Editor/transforms.js

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+// @flow
+import EditList from './plugins/EditList';
+import type { State } from './types';
+
+const { transforms } = EditList;
+
+type Options = {
+  type: string | Object,
+  wrapper?: string | Object,
+  append?: string | Object,
+};
+
+export function splitAndInsertBlock(state: State, options: Options) {
+  const { type, wrapper, append } = options;
+  let transform = state.transform();
+  const { document } = state;
+  const parent = document.getParent(state.startBlock.key);
+
+  // lists get some special treatment
+  if (parent && parent.type === 'list-item') {
+    transform = transforms.unwrapList(
+      transforms
+        .splitListItem(transform.collapseToStart())
+        .collapseToEndOfPreviousBlock()
+    );
+  }
+
+  transform = transform.insertBlock(type);
+
+  if (wrapper) transform = transform.wrapBlock(wrapper);
+  if (append) transform = transform.insertBlock(append);
+
+  return transform;
+}