perf(linter/plugins): provide loc via prototype#14552
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Pull Request Overview
Optimizes AST node loc property access by moving from individual object getters to prototype-based access, reducing performance overhead from ~300% to ~20%.
- Replace individual
locgetters on each AST node with a prototype-based approach - Add
NodeProtowith a singlelocgetter that all AST nodes inherit from - Modify code generation to insert
__proto__: NodeProtoinstead of individual getters
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#14355 added a getter for `loc` to all AST nodes in Oxlint's JS-side AST. Unfortunately it turned out to have been a massive perf hit. Reduce the cost by adding `loc` field to nodes via prototype, rather than adding a getter to each object individually. This does not entirely remove the cost of `loc`, but reduces it from about 300% perf hit to around ~20% (measured by Oxlint's performance linting VS Code repo with a simple JS plugin).
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#14355 added a getter for `loc` to all AST nodes in Oxlint's JS-side AST. Unfortunately it turned out to have been a massive perf hit. Reduce the cost by adding `loc` field to nodes via prototype, rather than adding a getter to each object individually. This does not entirely remove the cost of `loc`, but reduces it from about 300% perf hit to around ~20% (measured by Oxlint's performance linting VS Code repo with a simple JS plugin).
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## [1.23.0] - 2025-10-13 ### 🚀 Features - 452d128 linter: Node/no_process_env (#14536) (Kenneth Skovhus) - a9e1261 linter: Implement react-refresh/only-export-components (#14122) (Rintaro Itokawa) - a8d542b linter/no-duplicate-imports: Support `allowSeparateTypeImports` option (#14527) (camc314) - 75a529c linter: Add run info about what functions rules implement (#13839) (camchenry) - 4fbdef2 language_server: Support `fmt.configPath` configuration (#14502) (Sysix) - 4d3ce2e language_server: Autodetect root `.oxfmtrc.json` (#14466) (Sysix) ### 🐛 Bug Fixes - fb4a20d language_server: Add whitespace for `// oxlint-disable-next-line` fix (#14356) (Sysix) - 6fce7f4 oxlint/changelog: Remove duplicate changelog entries (#14528) (camc314) - 74e52f3 linter/plugins: Resolve JS plugins with ESM condition names (#14541) (magic-akari) - 9965676 linter/exhaustive-deps: Ignore empty strings passed to `additionalHooks` option (#14464) (Redas) - d0a8e3e linter: `vue/no_required_prop_with_default` called `Option::unwrap()` on a `None` value (#14491) (Sysix) - 1192ea2 linter: Correct `nextjs/no-typos` path handling (#14480) (shulaoda) - 2796b16 tsgolint: Pipe tsgolints stderr (#14477) (camc314) ### 🚜 Refactor - 6440cde linter: Remove lifetime of `Message` (#14481) (Sysix) - f599bef language_server: Move `Message` to `DiagnosticReport` transformation to one place (#14447) (Sysix) - 4f301de napi/parser, linter/plugins: Improve formatting of generated code (#14554) (overlookmotel) - 68c0252 napi/parser, linter/plugins: Shorten generated raw transfer deserializer code (#14553) (overlookmotel) - 20e884e linter: Store `LintService` in `LintRunner` (#14471) (Sysix) - 9e9c5ba linter: Simplify built-in lint plugin checks (#14518) (camchenry) - 1986e0f linter/no-ex-assign: Use let-else chain (#14526) (camc314) - ce9bcf0 linter/no-func-assign: Use let-else chain (#14525) (camc314) - a9cea7c language_server: Use `FxHashSet` for `ServerLinter::extended_paths` (#14517) (Sysix) - ea5838e linter/no-import-assign: Use let-else chain (#14524) (camc314) - f977700 language_server: Pass `LintOptions` to `Worker::refresh_server_linter` (#14510) (Sysix) - 54b001f linter/no-new-require: Improve diagnostic message clarity (#14511) (shulaoda) - 650ea68 linter: Improve nextjs/no-typos rule (#14476) (shulaoda) ### 📚 Documentation - 198f2e9 linter: Fix code example for `branches-sharing-code` (#14514) (camc314) - d776a17 linter: Improve `nextjs/no-typos` rule documentation (#14470) (shulaoda) ### ⚡ Performance - b44a30e language_server: Transform `Message` to `DiagnosticReport` with one call (#14448) (Sysix) - 31766fd linter/plugins: Provide `loc` via prototype (#14552) (overlookmotel) - aec0c08 linter: Allow analyzing node types in match blocks with guards (#14459) (camchenry) - 9044187 linter: Skip running node-specific rule if file contains no relevant nodes (#14457) (camchenry) - 422f54e linter: Only run rule run functions if implemented (#14454) (camchenry) - 2c228ae liner: Use top-level match for `no_obj_calls` (#14523) (camchenry) - c49d891 linter: Use match for `no_negated_condition` (#14522) (camchenry) - e222fc2 linter: Use match for `no_multi_assign` (#14521) (camchenry) - 4440516 linter: Refactor rules to take advantage of node type skipping (#14519) (camchenry) - 78261d6 linter: Refactor `no-invalid-fetch-options` to be more easily analyzed (#14458) (camchenry) ### 🧪 Testing - 8d8881d linter/plugins: Expand tests for module resolution of plugins (#14559) (overlookmotel) - 33b6cde language_server: Add basic tests for `WorkspaceWorker::did_change_configuration` (#14531) (Sysix) - bfe1ecd language_server: Add tests for `WorkspaceWorker::init_watchers` (#14516) (Sysix) Co-authored-by: camc314 <18101008+camc314@users.noreply.github.com>
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#14355 added a getter for
locto all AST nodes in Oxlint's JS-side AST. Unfortunately it turned out to have been a massive perf hit.Reduce the cost by adding
locfield to nodes via prototype, rather than adding a getter to each object individually.This does not entirely remove the cost of
loc, but reduces it from about 300% perf hit to around ~20% (measured by Oxlint's performance linting VS Code repo with a simple JS plugin).