fix(lane-switch): block switching a lane when on main and there are staging components

e2e/harmony/lanes/lane-from-lane.e2e.ts

@@ -160,9 +160,7 @@ describe('bit lane command', function () {
     });
     it('bit create should throw an error suggesting to export or reset first', () => {
       const output = helper.general.runWithTryCatch('bit lane create lane-b');
-      expect(output).to.have.string(
-        'unable to create a new lane, please export or reset the following components first'
-      );
+      expect(output).to.have.string('please export or reset the following components first');
     });
   });
 });

e2e/harmony/lanes/switch-lanes.e2e.ts

@@ -249,4 +249,22 @@ describe('bit lane command', function () {
       expect(list).to.have.lengthOf(1);
     });
   });
+  describe('switch from main to a lane when main has staged components', () => {
+    before(() => {
+      helper.scopeHelper.setNewLocalAndRemoteScopes();
+      helper.fixtures.populateComponents(1);
+      helper.command.tagAllWithoutBuild();
+      helper.command.export();
+      helper.command.createLane();
+      helper.command.snapAllComponentsWithoutBuild('--unmodified');
+      helper.command.export();
+      helper.command.switchLocalLane('main');
+      helper.command.tagAllWithoutBuild('--unmodified');
+    });
+    it('should block the switch and suggest to export or reset', () => {
+      expect(() => helper.command.switchLocalLane('dev')).to.throw(
+        'please export or reset the following components first'
+      );
+    });
+  });
 });

scopes/lanes/lanes/create-lane.ts

@@ -86,12 +86,12 @@ export function throwForInvalidLaneName(laneName: string) {
   }
 }
 
-async function throwForStagedComponents(consumer: Consumer) {
+export async function throwForStagedComponents(consumer: Consumer) {
   const componentList = new ComponentsList(consumer);
   const stagedComponents = await componentList.listExportPendingComponentsIds();
   if (stagedComponents.length) {
     throw new BitError(
-      `unable to create a new lane, please export or reset the following components first: ${stagedComponents.join(
+      `unable to switch/create a new lane, please export or reset the following components first: ${stagedComponents.join(
         ', '
       )}`
     );

scopes/lanes/lanes/switch-lanes.ts

@@ -25,6 +25,7 @@ import { Workspace } from '@teambit/workspace';
 import { Logger } from '@teambit/logger';
 import { BitError } from '@teambit/bit-error';
 import { LanesMain } from './lanes.main.runtime';
+import { throwForStagedComponents } from './create-lane';
 
 export type SwitchProps = {
   laneName: string;
@@ -51,6 +52,9 @@ export class LaneSwitcher {
 
   async switch(): Promise<ApplyVersionResults> {
     this.logger.setStatusLine(`switching lanes`);
+    if (this.workspace.isOnMain()) {
+      await throwForStagedComponents(this.consumer);
+    }
     await this.populateSwitchProps();
     const allComponentsStatus: ComponentStatus[] = await this.getAllComponentsStatus();
     const componentWithConflict = allComponentsStatus.find(

scopes/workspace/workspace/workspace.ts

@@ -674,6 +674,10 @@ export class Workspace implements ComponentFactory {
     return this.consumer.getCurrentLaneId();
   }
 
+  isOnMain(): boolean {
+    return this.consumer.isOnMain();
+  }
+
   /**
    * if checked out to a lane and the lane exists in the remote,
    * return the remote lane id (name+scope). otherwise, return null.