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arendjr · 2025-11-26T15:57:43Z

Summary

Follow-up to #8166, this adds flags to the regex literals.

@Netail Anything else you would need to finish up #8034?

Test Plan

Test added.

Docs

Inline comments.

changeset-bot · 2025-11-26T15:57:49Z

⚠️ No Changeset found

Latest commit: 1f87ec1

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coderabbitai · 2025-11-26T16:00:54Z

Walkthrough

This PR enhances RegExp literal handling in the type information system across multiple modules. It introduces a new RegexpLiteral struct with separate pattern and flags fields, replacing the previous simple text representation. A parsing helper extracts pattern and flags from regex literal tokens. The formatting output changes from a minimal "regex:" representation to a complete "/pattern/flags" format. Related updates occur in local inference logic and type data structures, with test coverage added for regex literals with flags.

Possibly related PRs

chore: add regex globals #8166: Modifies JS regex handling in the type info module, including updates to Literal::RegExp representation and associated test coverage.

Suggested labels

L-JavaScript, A-Type-Inference

Suggested reviewers

Netail

Pre-merge checks and finishing touches

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: adding flags support to regex literals, which is directly reflected in the codebase modifications across multiple files.
Description check	✅ Passed	The description is related to the changeset, mentioning it's a follow-up to #8166 that adds flags to regex literals, with test plan and documentation noted.

✨ Finishing touches

📝 Generate docstrings

🧪 Generate unit tests (beta)

Create PR with unit tests
Post copyable unit tests in a comment

📜 Recent review details

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between ac0fb2d and 1f87ec1.

⛔ Files ignored due to path filters (1)

crates/biome_js_type_info/tests/snapshots/infer_type_of_regex_with_flags.snap is excluded by !**/*.snap and included by **

📒 Files selected for processing (5)

crates/biome_js_type_info/src/format_type_info.rs (1 hunks)
crates/biome_js_type_info/src/local_inference.rs (3 hunks)
crates/biome_js_type_info/src/type_data.rs (2 hunks)
crates/biome_js_type_info/src/type_data/literal.rs (1 hunks)
crates/biome_js_type_info/tests/local_inference.rs (1 hunks)

🧰 Additional context used

📓 Path-based instructions (3)

**/*.rs

📄 CodeRabbit inference engine (CONTRIBUTING.md)

**/*.rs: Use the Rust dbg!() macro for debugging output during test execution, and pass the --show-output flag to cargo test to display debug output.
Use snapshot testing with the insta crate for testing in Rust projects. Accept or reject snapshots using cargo insta accept, cargo insta reject, or cargo insta review.
Write doc comments as doc tests in Rust using code blocks with assertions that will be executed during the testing phase.
Use rustdoc inline documentation for rules, assists, and their options. Create corresponding documentation PRs for other documentation updates against the next branch of the website repository.
Set the version metadata field in linter rule implementations to 'next' for newly created rules. Update this field to the new version number when releasing a minor or major version.

Files:

crates/biome_js_type_info/src/format_type_info.rs
crates/biome_js_type_info/tests/local_inference.rs
crates/biome_js_type_info/src/type_data.rs
crates/biome_js_type_info/src/local_inference.rs
crates/biome_js_type_info/src/type_data/literal.rs

crates/biome_js_type_info/**/*.rs

📄 CodeRabbit inference engine (crates/biome_js_type_info/CONTRIBUTING.md)

crates/biome_js_type_info/**/*.rs: No module may copy or clone data from another module in the module graph, not even behind an Arc
Use TypeReference instead of Arc for types that reference other types to avoid stale cache issues when modules are replaced
Store type data in linear vectors instead of using recursive data structures with Arc for improved data locality and performance
Use TypeReference variants (Qualifier, Resolved, Import, Unknown) to represent different phases of type resolution
Use TypeData::Unknown to indicate when type inference falls short or is not implemented
Distinguish between TypeData::Unknown and TypeData::UnknownKeyword to measure inference effectiveness versus explicit user-provided unknown types
When using ResolvedTypeData, track the ResolverId to ensure subsequent resolver calls use the correct context
Always apply the correct ResolverId when retrieving raw type data from ResolvedTypeData.as_raw_data() to prevent panics during subsequent resolution calls

Files:

crates/biome_js_type_info/src/format_type_info.rs
crates/biome_js_type_info/tests/local_inference.rs
crates/biome_js_type_info/src/type_data.rs
crates/biome_js_type_info/src/local_inference.rs
crates/biome_js_type_info/src/type_data/literal.rs

crates/biome_js_type_info/**/local_inference.rs

📄 CodeRabbit inference engine (crates/biome_js_type_info/CONTRIBUTING.md)

Implement local inference in dedicated modules to derive type definitions from expressions without context of surrounding scopes

Files:

crates/biome_js_type_info/tests/local_inference.rs
crates/biome_js_type_info/src/local_inference.rs

🧠 Learnings (26)

📚 Learning: 2025-11-24T18:05:27.784Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_formatter/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:27.784Z
Learning: Applies to crates/biome_js_formatter/**/*.rs : When formatting AST nodes, use mandatory tokens from the AST instead of hardcoding token strings (e.g., use `node.l_paren_token().format()` instead of `token("(")`)

Applied to files:

crates/biome_js_type_info/src/format_type_info.rs
crates/biome_js_type_info/src/local_inference.rs

📚 Learning: 2025-11-24T18:05:20.343Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_formatter/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:20.343Z
Learning: Applies to crates/biome_formatter/**/biome_*_formatter/src/context.rs : Define `<Language>FormatContext` struct in a `context.rs` file containing `comments` and `source_map` fields, implementing `FormatContext` and `CstFormatContext` traits

Applied to files:

crates/biome_js_type_info/src/format_type_info.rs

📚 Learning: 2025-11-24T18:05:27.784Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_formatter/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:27.784Z
Learning: Applies to crates/biome_js_formatter/**/*.rs : Import the `FormatNode` trait and implement it for your Node when creating formatters in biome_js_formatter

Applied to files:

crates/biome_js_type_info/src/format_type_info.rs
crates/biome_js_type_info/src/local_inference.rs

📚 Learning: 2025-11-24T18:05:42.338Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_type_info/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:42.338Z
Learning: Applies to crates/biome_js_type_info/**/*.rs : Use `TypeReference` variants (`Qualifier`, `Resolved`, `Import`, `Unknown`) to represent different phases of type resolution

Applied to files:

crates/biome_js_type_info/src/format_type_info.rs
crates/biome_js_type_info/tests/local_inference.rs
crates/biome_js_type_info/src/type_data.rs
crates/biome_js_type_info/src/local_inference.rs

📚 Learning: 2025-11-24T18:05:42.337Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_type_info/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:42.337Z
Learning: Applies to crates/biome_js_type_info/**/*.rs : Use `TypeReference` instead of `Arc` for types that reference other types to avoid stale cache issues when modules are replaced

Applied to files:

crates/biome_js_type_info/src/format_type_info.rs
crates/biome_js_type_info/tests/local_inference.rs
crates/biome_js_type_info/src/type_data.rs
crates/biome_js_type_info/src/local_inference.rs
crates/biome_js_type_info/src/type_data/literal.rs

📚 Learning: 2025-11-24T18:05:42.338Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_type_info/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:42.338Z
Learning: Applies to crates/biome_js_type_info/**/flattening.rs : Implement type flattening to simplify `TypeofExpression` variants once all component types are resolved

Applied to files:

crates/biome_js_type_info/src/format_type_info.rs
crates/biome_js_type_info/tests/local_inference.rs
crates/biome_js_type_info/src/type_data.rs
crates/biome_js_type_info/src/local_inference.rs

📚 Learning: 2025-11-24T18:05:42.338Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_type_info/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:42.338Z
Learning: Applies to crates/biome_js_type_info/**/*.rs : Distinguish between `TypeData::Unknown` and `TypeData::UnknownKeyword` to measure inference effectiveness versus explicit user-provided unknown types

Applied to files:

crates/biome_js_type_info/src/format_type_info.rs
crates/biome_js_type_info/tests/local_inference.rs
crates/biome_js_type_info/src/type_data.rs
crates/biome_js_type_info/src/local_inference.rs

📚 Learning: 2025-11-24T18:05:27.784Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_formatter/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:27.784Z
Learning: Applies to crates/biome_js_formatter/**/*.rs : For tokens that are not mandatory, use helper functions instead of hardcoding

Applied to files:

crates/biome_js_type_info/src/format_type_info.rs

📚 Learning: 2025-11-24T18:05:20.343Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_formatter/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:20.343Z
Learning: Applies to crates/biome_formatter/**/biome_*_formatter/tests/language.rs : Implement `TestFormatLanguage` trait in `tests/language.rs` for the formatter's test language

Applied to files:

crates/biome_js_type_info/src/format_type_info.rs

📚 Learning: 2025-11-24T18:05:42.338Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_type_info/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:42.338Z
Learning: Applies to crates/biome_js_type_info/**/*.rs : Store type data in linear vectors instead of using recursive data structures with `Arc` for improved data locality and performance

Applied to files:

crates/biome_js_type_info/src/format_type_info.rs
crates/biome_js_type_info/src/type_data.rs

📚 Learning: 2025-11-24T18:05:42.338Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_type_info/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:42.338Z
Learning: Applies to crates/biome_js_type_info/**/local_inference.rs : Implement local inference in dedicated modules to derive type definitions from expressions without context of surrounding scopes

Applied to files:

crates/biome_js_type_info/tests/local_inference.rs
crates/biome_js_type_info/src/type_data.rs
crates/biome_js_type_info/src/local_inference.rs

📚 Learning: 2025-11-24T18:05:42.338Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_type_info/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:42.338Z
Learning: Applies to crates/biome_js_type_info/**/*.rs : Use `TypeData::Unknown` to indicate when type inference falls short or is not implemented

Applied to files:

crates/biome_js_type_info/tests/local_inference.rs
crates/biome_js_type_info/src/type_data.rs
crates/biome_js_type_info/src/local_inference.rs

📚 Learning: 2025-11-24T18:05:42.338Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_type_info/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:42.338Z
Learning: Applies to crates/biome_js_type_info/**/js_module_info/collector.rs : Implement module-level (thin) inference to resolve `TypeReference::Qualifier` variants by looking up declarations in module scopes and handling import statements

Applied to files:

crates/biome_js_type_info/tests/local_inference.rs
crates/biome_js_type_info/src/type_data.rs
crates/biome_js_type_info/src/local_inference.rs

📚 Learning: 2025-11-24T18:05:42.338Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_type_info/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:42.338Z
Learning: Applies to crates/biome_js_type_info/**/scoped_resolver.rs : Implement full inference to resolve `TypeReference::Import` variants across the entire module graph

Applied to files:

crates/biome_js_type_info/tests/local_inference.rs
crates/biome_js_type_info/src/type_data.rs
crates/biome_js_type_info/src/local_inference.rs

📚 Learning: 2025-11-24T18:05:42.338Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_type_info/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:42.338Z
Learning: Applies to crates/biome_js_type_info/**/*.rs : When using `ResolvedTypeData`, track the `ResolverId` to ensure subsequent resolver calls use the correct context

Applied to files:

crates/biome_js_type_info/tests/local_inference.rs
crates/biome_js_type_info/src/type_data.rs

📚 Learning: 2025-11-24T18:03:52.013Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:03:52.013Z
Learning: Applies to **/*.rs : Use the Rust `dbg!()` macro for debugging output during test execution, and pass the `--show-output` flag to `cargo test` to display debug output.

Applied to files:

crates/biome_js_type_info/tests/local_inference.rs

📚 Learning: 2025-11-24T18:05:42.338Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_js_type_info/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:05:42.338Z
Learning: Applies to crates/biome_js_type_info/**/*.rs : Always apply the correct `ResolverId` when retrieving raw type data from `ResolvedTypeData.as_raw_data()` to prevent panics during subsequent resolution calls

Applied to files:

crates/biome_js_type_info/tests/local_inference.rs
crates/biome_js_type_info/src/type_data.rs

📚 Learning: 2025-08-20T16:24:59.781Z

Learnt from: arendjr
Repo: biomejs/biome PR: 7266
File: crates/biome_js_type_info/src/type.rs:94-102
Timestamp: 2025-08-20T16:24:59.781Z
Learning: In crates/biome_js_type_info/src/type.rs, the flattened_union_variants() method returns TypeReference instances that already have the correct module IDs applied to them. These references should be used directly with resolver.resolve_reference() without applying additional module ID transformations, as variant references may originate from nested unions in different modules.

Applied to files:

crates/biome_js_type_info/src/type_data.rs

📚 Learning: 2025-11-24T18:06:03.536Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_parser/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:06:03.536Z
Learning: Applies to crates/biome_parser/**/language_kind.rs : Add a new variant to `LanguageKind` enum in `language_kind.rs` file and implement all methods for the new language variant

Applied to files:

crates/biome_js_type_info/src/type_data.rs
crates/biome_js_type_info/src/type_data/literal.rs

📚 Learning: 2025-11-24T18:06:03.536Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_parser/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:06:03.536Z
Learning: Applies to crates/biome_parser/**/src/**/*.rs : Use `ParseSeparatedList` and `ParseNodeList` for parsing lists with error recovery to avoid infinite loops

Applied to files:

crates/biome_js_type_info/src/local_inference.rs

📚 Learning: 2025-11-24T18:06:03.536Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_parser/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:06:03.536Z
Learning: Applies to crates/biome_parser/**/src/**/*.rs : Implement a token source struct that wraps the lexer and implements `TokenSourceWithBufferedLexer` and `LexerWithCheckpoint` for lookahead and re-lexing capabilities

Applied to files:

crates/biome_js_type_info/src/local_inference.rs

📚 Learning: 2025-11-24T18:04:42.146Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:04:42.146Z
Learning: Applies to crates/biome_analyze/**/biome_*_analyze/lib/src/**/!(mod).rs : Rule implementation should use 'Type Query = Ast<NodeType>' to query the AST/CST for specific node types

Applied to files:

crates/biome_js_type_info/src/local_inference.rs

📚 Learning: 2025-11-24T18:04:42.146Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:04:42.146Z
Learning: Applies to crates/biome_analyze/**/biome_*_analyze/lib/src/**/!(mod).rs : Rules should use the semantic query 'Type Query = Semantic<NodeType>' to access semantic information like bindings and references

Applied to files:

crates/biome_js_type_info/src/local_inference.rs

📚 Learning: 2025-11-24T18:06:03.536Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_parser/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:06:03.536Z
Learning: Applies to crates/biome_parser/**/src/**/*.rs : Use `ConditionalParsedSyntax` for syntax that is only valid in specific contexts (e.g., strict mode, file types, language versions) and call `or_invalid_to_bogus()` to convert to a bogus node if not supported

Applied to files:

crates/biome_js_type_info/src/local_inference.rs

📚 Learning: 2025-11-24T18:04:42.146Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_analyze/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:04:42.146Z
Learning: Applies to crates/biome_analyze/**/biome_*_analyze/lib/src/**/!(mod).rs : Use 'declare_node_union!' macro to query multiple node types at once instead of repeating rule implementations for similar nodes

Applied to files:

crates/biome_js_type_info/src/local_inference.rs

📚 Learning: 2025-11-24T18:06:03.536Z

Learnt from: CR
Repo: biomejs/biome PR: 0
File: crates/biome_parser/CONTRIBUTING.md:0-0
Timestamp: 2025-11-24T18:06:03.536Z
Learning: Applies to crates/biome_parser/**/language_kind.rs : Add a new language prefix to the `LANGUAGE_PREFIXES` constant in `language_kind.rs` file

Applied to files:

crates/biome_js_type_info/src/type_data/literal.rs

🧬 Code graph analysis (2)

crates/biome_js_type_info/src/format_type_info.rs (2)

crates/biome_formatter/src/builders.rs (3)

token (251-259)

space (606-608)

text (279-283)

crates/biome_js_type_info/src/type_data/literal.rs (1)

text (44-46)

crates/biome_js_type_info/tests/local_inference.rs (2)

crates/biome_js_type_info/tests/utils.rs (1)

assert_type_data_snapshot (22-55)

crates/biome_js_type_info/src/local_inference.rs (3)

from_any_js_expression (425-602)

from_any_js_expression (2173-2180)

from_any_js_expression (2343-2425)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (12)

GitHub Check: Test Node.js API
GitHub Check: Bench (biome_js_parser)
GitHub Check: Bench (biome_js_analyze)
GitHub Check: Check Dependencies
GitHub Check: End-to-end tests
GitHub Check: Documentation
GitHub Check: autofix
GitHub Check: Bench (biome_js_formatter)
GitHub Check: Lint project (depot-windows-2022)
GitHub Check: Lint project (depot-ubuntu-24.04-arm-16)
GitHub Check: Test (depot-windows-2022-16)
GitHub Check: Test (depot-ubuntu-24.04-arm-16)

🔇 Additional comments (9)

crates/biome_js_type_info/src/type_data/literal.rs (1)

84-111: Well-documented addition.

The RegexpLiteral struct is cleanly designed with helpful inline documentation. The examples clearly illustrate both regex literal syntax (/hello/i) and RegExp constructor syntax, which is thoughtful for future maintainers.

crates/biome_js_type_info/src/type_data.rs (2)

25-26: LGTM!

Import correctly placed alongside other literal type imports.

651-651: LGTM!

The Literal::RegExp variant now carries the structured RegexpLiteral type, consistent with how other literals are handled.

crates/biome_js_type_info/src/local_inference.rs (4)

25-25: LGTM!

TextRange import added to support the new slicing logic.

31-31: LGTM!

RegexpLiteral import correctly added.

616-617: LGTM!

Clean integration with the new helper function.

2539-2559: Solid parsing logic.

The rfind('/') approach correctly handles escaped slashes within patterns (e.g., /a\/b/g) since \/ comprises two distinct characters. The guard for open_index == close_index is a sensible sanity check.

One minor observation: usize::from(literal.len()) on line 2548 is a no-op since TokenText::len() already returns a TextSize, which converts to usize. However, this is harmless and the explicit conversion arguably aids readability.

crates/biome_js_type_info/tests/local_inference.rs (1)

48-57: LGTM!

Good test coverage for regex literals with flags. Follows the established pattern nicely.

crates/biome_js_type_info/src/format_type_info.rs (1)

819-828: LGTM!

The formatted output now properly displays the full regex literal syntax. Empty flags gracefully produce /pattern/ without trailing noise.

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codspeed-hq · 2025-11-26T16:10:59Z

CodSpeed Performance Report

Merging #8279 will not alter performance

_{Comparing arendjr:add-flags-to-regex-literals (1f87ec1) with main (b51968b)}

Summary

✅ 58 untouched
⏩ 95 skipped¹

95 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

Netail · 2025-11-26T16:24:48Z

Hopefully that's it :)

chore: add flags to regex literals

1f87ec1

arendjr requested review from a team, Netail and siketyan November 26, 2025 15:57

github-actions bot added L-JavaScript Language: JavaScript and super languages A-Type-Inference Area: type inference labels Nov 26, 2025

arendjr merged commit 06f99f4 into biomejs:main Nov 26, 2025
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coderabbitai bot mentioned this pull request Nov 27, 2025

feat(js_analyze): implement useRegexpExec #8034

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l0ngvh pushed a commit to l0ngvh/biome that referenced this pull request Dec 21, 2025

chore: add flags to regex literals (biomejs#8279)

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coderabbitai bot mentioned this pull request Jan 15, 2026

feat(linter): add useUnicodeRegex rule #8773

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chore: add flags to regex literals#8279

chore: add flags to regex literals#8279
arendjr merged 1 commit intobiomejs:mainfrom
arendjr:add-flags-to-regex-literals

arendjr commented Nov 26, 2025

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arendjr commented Nov 26, 2025

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changeset-bot bot commented Nov 26, 2025

⚠️ No Changeset found

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coderabbitai bot commented Nov 26, 2025

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codspeed-hq bot commented Nov 26, 2025

CodSpeed Performance Report

Merging #8279 will not alter performance

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Netail commented Nov 26, 2025

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