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10 changes: 6 additions & 4 deletions packages/@lwc/engine-core/src/framework/invoker.ts
Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@ import { addErrorComponentStack } from '../shared/error';
import { evaluateTemplate, setVMBeingRendered, getVMBeingRendered } from './template';
import { runWithBoundaryProtection } from './vm';
import { logOperationStart, logOperationEnd, OperationId } from './profiler';
import { LightningElement } from './base-lightning-element';
import type { LightningElement } from './base-lightning-element';
import type { Template } from './template';
import type { VM } from './vm';
import type { LightningElementConstructor } from './base-lightning-element';
Expand Down Expand Up @@ -58,9 +58,11 @@ export function invokeComponentConstructor(vm: VM, Ctor: LightningElementConstru
// the "instanceof" operator would not work here since Locker Service provides its own
// implementation of LightningElement, so we indirectly check if the base constructor is
// invoked by accessing the component on the vm.
const isInvalidConstructor = lwcRuntimeFlags.LEGACY_LOCKER_ENABLED
? vmBeingConstructed.component !== result
: !(result instanceof LightningElement);
// TODO [W-17769475]: Restore this fix when we can reliably detect Locker enabled
// const isInvalidConstructor = lwcRuntimeFlags.LEGACY_LOCKER_ENABLED
// ? vmBeingConstructed.component !== result
// : !(result instanceof LightningElement);
const isInvalidConstructor = vmBeingConstructed.component !== result;

if (isInvalidConstructor) {
throw new TypeError(
Expand Down
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