chore(examples): fix util.js

[hiroppy]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

"before" feature is deprecated.

Motivation / Use-Case

Breaking Changes

Additional Info

[codecov]

Codecov Report

Merging #2686 into v4 will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##               v4    #2686   +/-   ##
=======================================
  Coverage   92.85%   92.85%           
=======================================
  Files          37       37           
  Lines        1316     1316           
  Branches      354      354           
=======================================
  Hits         1222     1222           
  Misses         89       89           
  Partials        5        5           

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[alexander-akait]

Thanks!