deps: update icu to 78.2

[nodejs-github-bot]

This is an automated update of icu to 78.2.

[nodejs-github-bot]

Review requested:

• @nodejs/security-wg

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69987/

[targos]

/cc @nodejs/i18n-api This output change is weird: https://ci.nodejs.org/job/node-test-commit-linuxone/nodes=rhel9-s390x/52175/testReport/junit/(root)/parallel/test_datetime_change_notify/

  AssertionError [ERR_ASSERTION]: The input did not match the regular expression /Irish Standard Time|Greenwich Mean Time/. Input:

  '11/1/2025, 10:49:12 AM GMT+00:00'

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.51%. Comparing base (842448b) to head (8464435).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #60523      +/-   ##
==========================================
+ Coverage   88.00%   88.51%   +0.50%     
==========================================
  Files         704      704              
  Lines      208739   208739              
  Branches    40196    40267      +71     
==========================================
+ Hits       183706   184765    +1059     
+ Misses      16992    15990    -1002     
+ Partials     8041     7984      -57     

see 103 files with indirect coverage changes

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[richardlau]

/cc @nodejs/i18n-api This output change is weird: https://ci.nodejs.org/job/node-test-commit-linuxone/nodes=rhel9-s390x/52175/testReport/junit/(root)/parallel/test_datetime_change_notify/

  AssertionError [ERR_ASSERTION]: The input did not match the regular expression /Irish Standard Time|Greenwich Mean Time/. Input:

  '11/1/2025, 10:49:12 AM GMT+00:00'

FWIW it looks like a change when DST is not in effect (no longer outputs Greenwich Mean time):

> process.env.TZ='Europe/Dublin'
'Europe/Dublin'
> new Date('2025/10/01').toLocaleString('en-US', { timeZoneName: 'long' })
'10/1/2025, 12:00:00 AM Irish Standard Time'
> new Date('2025/11/01').toLocaleString('en-US', { timeZoneName: 'long' })
'11/1/2025, 12:00:00 AM GMT+00:00'
>

[targos]

/cc @srl295

The new output looks more like what we should get with timeZoneName: "longOffset"

[targos]

I pushed an update to the test, but still not convinced that it's an expected change.

[srl295]

I pushed an update to the test, but still not convinced that it's an expected change.

Can you file a CLDR issue ?

[targos]

CLDR bug: https://unicode-org.atlassian.net/browse/CLDR-19136

[srl295]

CLDR bug: https://unicode-org.atlassian.net/browse/CLDR-19136

it's now an ICU bug, precipitated by a CLDR change.

[targos]

https://unicode-org.atlassian.net/browse/ICU-23278

Let's wait for 78.2 or 79.1.

[richardlau]

https://unicode-org.atlassian.net/browse/ICU-23278

Let's wait for 78.2 or 79.1.

SGTM. FWIW unicode-org/icu#3784 updates icu4c/source/data/misc/metaZones.txt which we don't check into the Node.js source tree so we'd have to regenerate deps/icu-small/source/data/in/icudt78l.dat.bz2 (i.e. we cannot use the floating patch method in https://github.com/nodejs/node/blob/main/doc/contributing/maintaining/maintaining-icu.md#floating-patches-to-icu).

Having said that, we do regenerate the dat file to pick up timezone updates (there's one coming (2025c) from unicode-org/icu-data#46).

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70756/

[srl295]

looks good. Thanks @targos for the bug report that was part of precipitating the CLDR and ICU dot-release!

[srl295]

I can't read the AIX failing error, can anyone grant access to @srl295 (jenkins)