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Leverage modern JavaScript operators and patterns for cleaner, more robust null and undefined handling. This improves code readability and reduces boilerplate while maintaining safety.

Key patterns to adopt:

1. Nullish coalescing (??) for default values when you specifically want to handle null and undefined:

   // Instead of
   return this.args.onChange ? this.args.onChange : () => {};
   // Use
   return this.args.onChange ?? (() => {});
   

2. Nullish coalescing assignment (??=) for lazy initialization:

   // Instead of
   if (!this.#pendingCleanup[phase]) {
     this.#pendingCleanup[phase] = [];
   }
   // Use
   this.#pendingCleanup[phase] ??= [];
   

3. Logical OR assignment (||=) for falsy value defaults:

   // Instead of
   value = value || "";
   // Use
   value ||= "";
   

4. Leverage truthy/falsy behavior to simplify boolean checks: ```javascript // Instead of return d.hours() !== 0 || d.minutes() !== 0 || d.seconds() !== 0; // Use return d.hours() || d.minutes() || d.seconds();

// Instead of .filter((e) => e) // Use .filter(Boolean)

5. **Avoid redundant null checks** when functions handle undefined gracefully:
```javascript
// Instead of
if (this.handleBlurTimer) {
  cancel(this.handleBlurTimer);
}
// Use (since cancel handles undefined)
cancel(this.handleBlurTimer);

These patterns reduce code verbosity while maintaining or improving null safety, and they clearly express intent about how null/undefined values should be handled.