feat(parser): add more helps to parser errors

[sapphi-red]

Added more helps to parser errors to make it easier to understand how the error can be resolved.

[sapphi-red]

• feat(parser): add more helps to parser errors #15186 👈 (View in Graphite)
• fix(tasks/coverage): skip some babel tests on Windows as well #15185
• main

---

How to use the Graphite Merge Queue

Add either label to this PR to merge it via the merge queue:

• 0-merge - adds this PR to the back of the merge queue
• hotfix - for urgent hot fixes, skip the queue and merge this PR next

You must have a Graphite account in order to use the merge queue. Sign up using this link.

An organization admin has enabled the Graphite Merge Queue in this repository.

Please do not merge from GitHub as this will restart CI on PRs being processed by the merge queue.

This stack of pull requests is managed by Graphite. Learn more about stacking.

[Boshen]

I like this.

[codspeed-hq]

CodSpeed Performance Report

Merging #15186 will not alter performance

_{Comparing 10-31-feat_parser_add_more_helps_to_parser_errors (0b45396) with main (85fb8e8)¹}

Summary

✅ 37 untouched

Footnotes

1. No successful run was found on main (205aab6) during the generation of this report, so 85fb8e8 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[Copilot]

Pull Request Overview

This pull request enhances error messages throughout the parser by adding helpful suggestions to diagnostic messages. The main goal is to improve the developer experience by providing actionable guidance when parsing errors occur.

Key changes:

• Added help messages to over 30+ different error diagnostics
• Fixed typo: "thew" → "the" in new.target error messages
• Fixed typo: "missinginitializer" → "missing_initializer" in function name
• Fixed typo: "Try insert" → "Try inserting" for semicolon insertion help
• Added REGEXP_FLAGS_LIST constant for consistent flag validation messaging
• Enhanced several error diagnostics with contextual labels for better clarity

Reviewed Changes

Copilot reviewed 10 out of 16 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
crates/oxc_parser/src/diagnostics.rs	Added help messages to 30+ error diagnostics and improved message clarity
crates/oxc_semantic/src/checker/javascript.rs	Added help messages for 'arguments' usage errors and new.target errors, fixed typo
crates/oxc_parser/src/js/class.rs	Enhanced extends/implements clause error messages with dual labels
crates/oxc_parser/src/js/declaration.rs	Fixed function name typo
crates/oxc_ast/src/ast/literal.rs	Added REGEXP_FLAGS_LIST constant for validation messages
tasks/coverage/snapshots/*.snap	Updated snapshots to reflect new error messages
napi/parser/test/parse.test.ts	Updated test expectations for new error messages

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Boshen]

Merge activity

• Oct 31, 7:10 AM UTC: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Oct 31, 7:10 AM UTC: Boshen added this pull request to the Graphite merge queue.
• Oct 31, 7:16 AM UTC: Merged by the Graphite merge queue.