Bug 1737971 - Remove lodash flatten/flattenDeep usage r=nchevobbe

Depends on D135081

Differential Revision: https://phabricator.services.mozilla.com/D135092

devtools/client/debugger/src/actions/sources/newSources.js

@@ -7,8 +7,6 @@
  * @module actions/sources
  */
 
-import { flatten } from "lodash";
-
 import { insertSourceActors } from "../../actions/source-actors";
 import { makeSourceId } from "../../client/firefox/create";
 import { toggleBlackBox } from "./blackbox";
@@ -54,7 +52,7 @@ function loadSourceMaps(cx, sources) {
 
       await sourceQueue.flush();
 
-      return flatten(sourceList);
+      return sourceList.flat();
     } catch (error) {
       if (!(error instanceof ContextError)) {
         throw error;

devtools/client/debugger/src/utils/sources-tree/getDirectories.js

@@ -3,7 +3,6 @@
  * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
 
 import { createParentMap } from "./utils";
-import flattenDeep from "lodash/flattenDeep";
 
 function findSourceItem(sourceTree, source) {
   function _traverse(subtree) {
@@ -35,7 +34,7 @@ export function findSourceTreeNodes(sourceTree, path) {
   }
 
   const result = _traverse(sourceTree);
-  return Array.isArray(result) ? flattenDeep(result) : result;
+  return Array.isArray(result) ? result.flat(Infinity) : result;
 }
 
 function getAncestors(sourceTree, item) {