default-value-assignment created by RohanBhanderi - https://repl.it/@RohanBhanderi/default-value-assignment

default-value-assignment.js

const DEFAULT_PROCESS_ASYNC  = true;

// config.processAsync may be undefined but never null
const config = {
  processAsync: undefined,
};

// default value assignment
const {
  processAsync = DEFAULT_PROCESS_ASYNC,
} = config;

console.log(processAsync);