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src: update std::vector<v8::Local<T>> to use v8::LocalVector<T> #57578

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According to V8's public API documentation, local handles (i.e., objects of type v8::Local) "should never be allocated on the heap". This replaces the usage of heap-allocated data structures containing instances of v8::Local, specifically the std::vector<v8::Local<v8::String>> with recently introduced v8::LocalVector<T>.

This is first of the series of commits to replace all std::vector<v8::Local<T>> to use v8::LocalVector<T>.

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@nodejs-github-bot nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. needs-ci PRs that need a full CI run. labels Mar 21, 2025
@anonrig anonrig requested a review from jasnell March 21, 2025 15:33
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codecov bot commented Mar 21, 2025

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.22%. Comparing base (922ce9d) to head (c8f2584).
Report is 25 commits behind head on main.

Additional details and impacted files
@@            Coverage Diff             @@
##             main   #57578      +/-   ##
==========================================
- Coverage   90.23%   90.22%   -0.02%     
==========================================
  Files         629      630       +1     
  Lines      184939   185054     +115     
  Branches    36232    36249      +17     
==========================================
+ Hits       166885   166961      +76     
- Misses      11011    11036      +25     
- Partials     7043     7057      +14     
Files with missing lines Coverage Δ
src/node_builtins.cc 79.12% <100.00%> (+1.13%) ⬆️
src/node_builtins.h 100.00% <ø> (ø)

... and 57 files with indirect coverage changes

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According to V8's public API documentation, local handles
(i.e., objects of type v8::Local<T>) "should never be allocated
on the heap". This replaces the usage of heap-allocated data
structures containing instances of `v8::Local`, specifically the
`std::vector<v8::Local<v8::String>>` with recently
introduced `v8::LocalVector<T>`.

This is first of the series of commits to replace all
`std::vector<v8::Local<T>>` to use `v8::LocalVector<T>`.
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