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Pankaj Jangra 2Pankaj Jangra 2 

$A is not defined in LWC, working fine in one sandbox but not in other

I want to refresh the view of LWC using eval("$A.get('e.force:refreshView').fire();"); but scripting error "$A is not defined". It's interesting as the same code is working fine in one sandbox but not in another.  
SwethaSwetha (Salesforce Developers) 
HI Pankaj,
> It's strange that it works in another sandbox because the $A syntax is specific to Aura components and is not available in LWC.

> Are there any relevant differences in the components, modules, or features being used in the two sandboxes?

> Can you share the context in which the code is being executed? Is the code placed within LWC and not an Aura component or other context?

Alternatively, have you tried to use the the standard refreshApex method instead of $A.get('e.force:refreshView').fire(); in LWC. 
Example: 
import { refreshApex } from '@salesforce/apex';

// Call this function to refresh the view
refreshView() {
  // Refresh the data using refreshApex
  return refreshApex(this.yourQueryResultVariable);
}
Related: https://salesforce.stackexchange.com/questions/340138/lwc-variable-not-defined
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