fix(transform): enable `enum_eval` for `transformSync` and vite TS transform by Dunqing · Pull Request #9325 · rolldown/rolldown

Dunqing · 2026-05-08T01:42:45Z

Summary

Fixes the bug where transformSync, the vite TS transform plugin, and the bundler (when define triggers a program mutation) emitted a corrupt reverse-mapping line for string-enum alias members. For input

enum Theme {
  Light = "Light",
  Dark = "Dark",
  Default = Theme.Light,
}

rolldown produced

Theme[Theme["Default"] = Theme.Light] = "Default";

which overwrites Theme["Light"]'s reverse mapping with "Default". Expected (matching tsc):

Theme["Default"] = "Light";

Cause

The oxc TS transformer's enum lowering looks up each member's constant value via Scoping::get_enum_member_value (crates/oxc_transformer/src/typescript/enum.rs:310). That table is only populated when the SemanticBuilder is built with with_enum_eval(true). When it isn't, every member returns None, so the transformer takes the non-string-init branch and emits the Foo[Foo["x"] = init] = "x" reverse-mapping form regardless of whether init is statically a string.

The bundler's initial build (crates/rolldown/src/utils/pre_process_ecma_ast.rs:66) already enables enum_eval, but four other call sites that hand a Scoping to Transformer::build_with_scoping did not:

transformSync (crates/rolldown_common/src/utils/enhanced_transform.rs) — initial build and the fallback used after ReplaceGlobalDefines consumes the scoping.
The vite TS transform plugin (crates/rolldown_plugin_vite_transform/src/lib.rs).
The bundler's recreate_scoping (crates/rolldown/src/utils/pre_process_ecma_ast.rs:238), which feeds the transformer when the define plugin has consumed the original scoping.

Fix

Add .with_enum_eval(true) to all four call sites:

crates/rolldown_common/src/utils/enhanced_transform.rs — initial build before transformer.
crates/rolldown_common/src/utils/enhanced_transform.rs — fallback rebuild when ReplaceGlobalDefines consumed the original scoping.
crates/rolldown_plugin_vite_transform/src/lib.rs — vite TS transform plugin.
crates/rolldown/src/utils/pre_process_ecma_ast.rs — recreate_scoping, the fallback used by step 3 (transformer) when define has consumed scoping. Later callers of recreate_scoping (inject / DCE / PreProcessor) run after enums have been lowered to IIFEs, so the eval pass is a no-op there.

Closes #9312

Test plan

Added two transformSync regression tests in packages/rolldown/tests/utils/transform.test.ts (string-enum alias forward-only, numeric-enum alias reverse-mapping retained).
Added a bundler fixture under crates/rolldown/tests/rolldown/issues/9312/ covering define + string-enum-alias.
All 24 existing enum-related Rust integration tests pass.
All 38 define-related tests pass.
cargo clippy -p rolldown_common -p rolldown_plugin_vite_transform -- -D warnings clean.
Verified the issue's exact transformSync repro (string, numeric, mixed enums) matches tsc output.

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Dunqing · 2026-05-08T12:41:35Z

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codspeed-hq · 2026-05-11T08:27:23Z

Merging this PR will not alter performance

✅ 4 untouched benchmarks
⏩ 10 skipped benchmarks¹

_{Comparing fix/transform-sync-enum-eval (d0b9526) with main (8ada1f7)²}

10 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. ↩
No successful run was found on main (5fb6a8e) during the generation of this report, so 8ada1f7 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

graphite-app · 2026-05-12T08:32:29Z

Merge activity

May 12, 8:32 AM UTC: Dunqing added this pull request to the Graphite merge queue.
May 12, 8:41 AM UTC: Merged by the Graphite merge queue.

…ansform (#9325) Related: oxc-project/oxc#22252 ## Summary Fixes the bug where `transformSync`, the vite TS transform plugin, and the bundler (when `define` triggers a program mutation) emitted a corrupt reverse-mapping line for string-enum alias members. For input ```ts enum Theme { Light = "Light", Dark = "Dark", Default = Theme.Light, } ``` rolldown produced ```js Theme[Theme["Default"] = Theme.Light] = "Default"; ``` which overwrites `Theme["Light"]`'s reverse mapping with `"Default"`. Expected (matching `tsc`): ```js Theme["Default"] = "Light"; ``` ## Cause The oxc TS transformer's enum lowering looks up each member's constant value via `Scoping::get_enum_member_value` (`crates/oxc_transformer/src/typescript/enum.rs:310`). That table is only populated when the `SemanticBuilder` is built with `with_enum_eval(true)`. When it isn't, every member returns `None`, so the transformer takes the non-string-init branch and emits the `Foo[Foo["x"] = init] = "x"` reverse-mapping form regardless of whether `init` is statically a string. The bundler's initial build (`crates/rolldown/src/utils/pre_process_ecma_ast.rs:66`) already enables `enum_eval`, but four other call sites that hand a `Scoping` to `Transformer::build_with_scoping` did not: - `transformSync` (`crates/rolldown_common/src/utils/enhanced_transform.rs`) — initial build and the fallback used after `ReplaceGlobalDefines` consumes the scoping. - The vite TS transform plugin (`crates/rolldown_plugin_vite_transform/src/lib.rs`). - The bundler's `recreate_scoping` (`crates/rolldown/src/utils/pre_process_ecma_ast.rs:238`), which feeds the transformer when the define plugin has consumed the original scoping. ## Fix Add `.with_enum_eval(true)` to all four call sites: - `crates/rolldown_common/src/utils/enhanced_transform.rs` — initial build before transformer. - `crates/rolldown_common/src/utils/enhanced_transform.rs` — fallback rebuild when `ReplaceGlobalDefines` consumed the original scoping. - `crates/rolldown_plugin_vite_transform/src/lib.rs` — vite TS transform plugin. - `crates/rolldown/src/utils/pre_process_ecma_ast.rs` — `recreate_scoping`, the fallback used by step 3 (transformer) when define has consumed scoping. Later callers of `recreate_scoping` (inject / DCE / PreProcessor) run after enums have been lowered to IIFEs, so the eval pass is a no-op there. Closes #9312 ## Test plan - [x] Added two `transformSync` regression tests in `packages/rolldown/tests/utils/transform.test.ts` (string-enum alias forward-only, numeric-enum alias reverse-mapping retained). - [x] Added a bundler fixture under `crates/rolldown/tests/rolldown/issues/9312/` covering define + string-enum-alias. - [x] All 24 existing enum-related Rust integration tests pass. - [x] All 38 define-related tests pass. - [x] `cargo clippy -p rolldown_common -p rolldown_plugin_vite_transform -- -D warnings` clean. - [x] Verified the issue's exact `transformSync` repro (string, numeric, mixed enums) matches `tsc` output.

…9326) ## Summary Centralize the `with_enum_eval(true)` invariant required for any `Scoping` that will be passed to `Transformer::build_with_scoping`. After #9325 the same option needed to be set at five call sites; missing it at any one of them recreates the string-enum-alias bug. Wrapping it in a single helper makes the invariant a property of the function name instead of a footgun spread across crates. ## Cause Five call sites that hand a `Scoping` to the transformer were each spelling out `SemanticBuilder::new().with_enum_eval(true)` (or worse, omitting the flag and silently producing the buggy reverse-mapping form for string-enum aliases). Adding a new transformer entry point in the future would require remembering this same invariant. ## Fix Add `pub fn semantic_builder_for_transform()` in `crates/rolldown_ecmascript/src/ecma_ast/helpers.rs`, re-exported from `rolldown_ecmascript::*`. The doc comment on the helper captures the WHY (`get_enum_member_value` is only populated when `enum_eval` is on; without it, string-enum aliases get the corrupt `Foo[Foo["x"] = init] = "x"` form). Migrate all five call sites to start from the helper: - `crates/rolldown/src/utils/pre_process_ecma_ast.rs` — initial bundler build (chains `with_check_syntax_error`). - `crates/rolldown/src/utils/pre_process_ecma_ast.rs::recreate_scoping` — post-define fallback (chains `with_stats`). - `crates/rolldown_common/src/utils/enhanced_transform.rs` — initial build for `transformSync`. - `crates/rolldown_common/src/utils/enhanced_transform.rs` — fallback rebuild after `ReplaceGlobalDefines`. - `crates/rolldown_plugin_vite_transform/src/lib.rs` — vite TS transform plugin. The post-transformer rebuild for `InjectGlobalVariables` (`enhanced_transform.rs:406`) is intentionally left as a bare `SemanticBuilder::new()` — enum_eval is semantically irrelevant after enums have been lowered. Adds `rolldown_ecmascript = { workspace = true }` to `crates/rolldown_plugin_vite_transform/Cargo.toml` so the plugin can reach the helper. ## Test plan - [x] No new test surface — covered by the regression tests already in #9325 (Rust fixture `/issues/9312/`, TS unit tests in `packages/rolldown/tests/utils/transform.test.ts`). - [x] All 24 enum-related Rust tests, 38 define-related tests, and 49 `transform.test.ts` cases pass. - [x] `cargo clippy -p rolldown_ecmascript -p rolldown_common -p rolldown_plugin_vite_transform -- -D warnings` clean.

@shulaoda

## [1.0.1] - 2026-05-13 ### 🚀 Features - experimental/lazy-barrel: advice on oversized barrel modules (#9236) by @shulaoda - rolldown: inline optional-chain enum access (#9379) by @Dunqing - chunk-optimization: dedupe already-loaded dynamic deps (#9305) by @IWANABETHATGUY - binding: call moduleParsed hook in ParallelJsPlugin (#9318) by @jaehafe ### 🐛 Bug Fixes - transform: enable `enum_eval` for `transformSync` and vite TS transform (#9325) by @Dunqing - error: remove severity prefix from diagnostic messages (#9262) by @Kyujenius - deps: pin pnpm to 10.23.0 to work around catalog mismatch on Netlify (#9364) by @shulaoda - ci: pin mimalloc-safe to 0.1.58 (#9361) by @shulaoda - dev/lazy: fix exports of lazy requests in lazy chunks (#9249) by @h-a-n-a - rolldown_plugin_vite_resolve: handle errors in `resolveSubpathImports` callback (#9355) by @sapphi-red - rolldown_plugin_lazy_compilation: use loadExports for fetched proxy to preserve original export names (#9132) by @h-a-n-a - common: include offending index in HybridIndexVec panic message (#9296) by @SAY-5 ### 🚜 Refactor - ecmascript: extract semantic_builder_for_transform helper (#9326) by @Dunqing - test: extract reusable static-import-cycle helper (#9332) by @IWANABETHATGUY ### 📚 Documentation - clarify scope of `topLevelVar` (#9380) by @IWANABETHATGUY - meta/design: add ast-mutation design doc (#9338) by @hyf0 - feat: add ai policy in contribution guide (#9315) by @mdong1909 ### ⚡ Performance - binding: enable mimalloc v3 to reduce idle memory (#9349) by @shulaoda ### 🧪 Testing - mcs: cover require() in `$initial` group (#9376) by @hyf0 - add regression for CJS facade chunk merge into entry (#9351) by @IWANABETHATGUY ### ⚙️ Miscellaneous Tasks - switch prepare-release to manual dispatch with version input (#9383) by @shulaoda - migrate `@rolldown/pluginutils` to `rolldown/plugins` (#9317) by @shulaoda - deps: pin libmimalloc-sys2 to 0.1.54 (#9372) by @shulaoda - replace `igorskyflyer/action-readfile` with `cat` (#9369) by @sapphi-red - deps: update test262 submodule for tests (#9371) by @rolldown-guard[bot] - use app token for test dep update PRs (#9368) by @sapphi-red - replace some actions with gh commands (#9367) by @sapphi-red - replace action-semantic-pull-request with inline regex (#9366) by @sapphi-red - remove pull_request_target workflows (#9188) by @Boshen - deps: upgrade oxc to 0.130.0 (#9360) by @shulaoda - deps: update github actions (major) (#9348) by @renovate[bot] - deps: update github actions (#9341) by @renovate[bot] - deps: update rust crates (#9344) by @renovate[bot] - deps: update crate-ci/typos action to v1.46.1 (#9357) by @renovate[bot] - deps: update npm packages (#9343) by @renovate[bot] - deps: update pnpm to v10.33.4 (#9347) by @renovate[bot] - deps: update dependency rolldown-plugin-dts to ^0.25.0 (#9346) by @renovate[bot] - .claude: add rolldown-repl encoder, rename decode skill (#9352) by @IWANABETHATGUY - deps: update crate-ci/typos action to v1.46.0 (#9345) by @renovate[bot] - deps: update napi to v3.8.6 (#9342) by @renovate[bot] - deps: update dependency vite-plus to v0.1.20 (#9340) by @renovate[bot] - enable rollup chunking-form test (#9335) by @IWANABETHATGUY - typo: fix typo in watcher options comment (#9324) by @thescripted ### ❤️ New Contributors * @Kyujenius made their first contribution in [#9262](#9262) * @SAY-5 made their first contribution in [#9296](#9296) * @thescripted made their first contribution in [#9324](#9324) Co-authored-by: shulaoda <[email protected]>

…ansform (#9325) Related: oxc-project/oxc#22252 ## Summary Fixes the bug where `transformSync`, the vite TS transform plugin, and the bundler (when `define` triggers a program mutation) emitted a corrupt reverse-mapping line for string-enum alias members. For input ```ts enum Theme { Light = "Light", Dark = "Dark", Default = Theme.Light, } ``` rolldown produced ```js Theme[Theme["Default"] = Theme.Light] = "Default"; ``` which overwrites `Theme["Light"]`'s reverse mapping with `"Default"`. Expected (matching `tsc`): ```js Theme["Default"] = "Light"; ``` ## Cause The oxc TS transformer's enum lowering looks up each member's constant value via `Scoping::get_enum_member_value` (`crates/oxc_transformer/src/typescript/enum.rs:310`). That table is only populated when the `SemanticBuilder` is built with `with_enum_eval(true)`. When it isn't, every member returns `None`, so the transformer takes the non-string-init branch and emits the `Foo[Foo["x"] = init] = "x"` reverse-mapping form regardless of whether `init` is statically a string. The bundler's initial build (`crates/rolldown/src/utils/pre_process_ecma_ast.rs:66`) already enables `enum_eval`, but four other call sites that hand a `Scoping` to `Transformer::build_with_scoping` did not: - `transformSync` (`crates/rolldown_common/src/utils/enhanced_transform.rs`) — initial build and the fallback used after `ReplaceGlobalDefines` consumes the scoping. - The vite TS transform plugin (`crates/rolldown_plugin_vite_transform/src/lib.rs`). - The bundler's `recreate_scoping` (`crates/rolldown/src/utils/pre_process_ecma_ast.rs:238`), which feeds the transformer when the define plugin has consumed the original scoping. ## Fix Add `.with_enum_eval(true)` to all four call sites: - `crates/rolldown_common/src/utils/enhanced_transform.rs` — initial build before transformer. - `crates/rolldown_common/src/utils/enhanced_transform.rs` — fallback rebuild when `ReplaceGlobalDefines` consumed the original scoping. - `crates/rolldown_plugin_vite_transform/src/lib.rs` — vite TS transform plugin. - `crates/rolldown/src/utils/pre_process_ecma_ast.rs` — `recreate_scoping`, the fallback used by step 3 (transformer) when define has consumed scoping. Later callers of `recreate_scoping` (inject / DCE / PreProcessor) run after enums have been lowered to IIFEs, so the eval pass is a no-op there. Closes #9312 ## Test plan - [x] Added two `transformSync` regression tests in `packages/rolldown/tests/utils/transform.test.ts` (string-enum alias forward-only, numeric-enum alias reverse-mapping retained). - [x] Added a bundler fixture under `crates/rolldown/tests/rolldown/issues/9312/` covering define + string-enum-alias. - [x] All 24 existing enum-related Rust integration tests pass. - [x] All 38 define-related tests pass. - [x] `cargo clippy -p rolldown_common -p rolldown_plugin_vite_transform -- -D warnings` clean. - [x] Verified the issue's exact `transformSync` repro (string, numeric, mixed enums) matches `tsc` output.

…9326) ## Summary Centralize the `with_enum_eval(true)` invariant required for any `Scoping` that will be passed to `Transformer::build_with_scoping`. After #9325 the same option needed to be set at five call sites; missing it at any one of them recreates the string-enum-alias bug. Wrapping it in a single helper makes the invariant a property of the function name instead of a footgun spread across crates. ## Cause Five call sites that hand a `Scoping` to the transformer were each spelling out `SemanticBuilder::new().with_enum_eval(true)` (or worse, omitting the flag and silently producing the buggy reverse-mapping form for string-enum aliases). Adding a new transformer entry point in the future would require remembering this same invariant. ## Fix Add `pub fn semantic_builder_for_transform()` in `crates/rolldown_ecmascript/src/ecma_ast/helpers.rs`, re-exported from `rolldown_ecmascript::*`. The doc comment on the helper captures the WHY (`get_enum_member_value` is only populated when `enum_eval` is on; without it, string-enum aliases get the corrupt `Foo[Foo["x"] = init] = "x"` form). Migrate all five call sites to start from the helper: - `crates/rolldown/src/utils/pre_process_ecma_ast.rs` — initial bundler build (chains `with_check_syntax_error`). - `crates/rolldown/src/utils/pre_process_ecma_ast.rs::recreate_scoping` — post-define fallback (chains `with_stats`). - `crates/rolldown_common/src/utils/enhanced_transform.rs` — initial build for `transformSync`. - `crates/rolldown_common/src/utils/enhanced_transform.rs` — fallback rebuild after `ReplaceGlobalDefines`. - `crates/rolldown_plugin_vite_transform/src/lib.rs` — vite TS transform plugin. The post-transformer rebuild for `InjectGlobalVariables` (`enhanced_transform.rs:406`) is intentionally left as a bare `SemanticBuilder::new()` — enum_eval is semantically irrelevant after enums have been lowered. Adds `rolldown_ecmascript = { workspace = true }` to `crates/rolldown_plugin_vite_transform/Cargo.toml` so the plugin can reach the helper. ## Test plan - [x] No new test surface — covered by the regression tests already in #9325 (Rust fixture `/issues/9312/`, TS unit tests in `packages/rolldown/tests/utils/transform.test.ts`). - [x] All 24 enum-related Rust tests, 38 define-related tests, and 49 `transform.test.ts` cases pass. - [x] `cargo clippy -p rolldown_ecmascript -p rolldown_common -p rolldown_plugin_vite_transform -- -D warnings` clean.

@shulaoda

## [1.0.1] - 2026-05-13 ### 🚀 Features - experimental/lazy-barrel: advice on oversized barrel modules (#9236) by @shulaoda - rolldown: inline optional-chain enum access (#9379) by @Dunqing - chunk-optimization: dedupe already-loaded dynamic deps (#9305) by @IWANABETHATGUY - binding: call moduleParsed hook in ParallelJsPlugin (#9318) by @jaehafe ### 🐛 Bug Fixes - transform: enable `enum_eval` for `transformSync` and vite TS transform (#9325) by @Dunqing - error: remove severity prefix from diagnostic messages (#9262) by @Kyujenius - deps: pin pnpm to 10.23.0 to work around catalog mismatch on Netlify (#9364) by @shulaoda - ci: pin mimalloc-safe to 0.1.58 (#9361) by @shulaoda - dev/lazy: fix exports of lazy requests in lazy chunks (#9249) by @h-a-n-a - rolldown_plugin_vite_resolve: handle errors in `resolveSubpathImports` callback (#9355) by @sapphi-red - rolldown_plugin_lazy_compilation: use loadExports for fetched proxy to preserve original export names (#9132) by @h-a-n-a - common: include offending index in HybridIndexVec panic message (#9296) by @SAY-5 ### 🚜 Refactor - ecmascript: extract semantic_builder_for_transform helper (#9326) by @Dunqing - test: extract reusable static-import-cycle helper (#9332) by @IWANABETHATGUY ### 📚 Documentation - clarify scope of `topLevelVar` (#9380) by @IWANABETHATGUY - meta/design: add ast-mutation design doc (#9338) by @hyf0 - feat: add ai policy in contribution guide (#9315) by @mdong1909 ### ⚡ Performance - binding: enable mimalloc v3 to reduce idle memory (#9349) by @shulaoda ### 🧪 Testing - mcs: cover require() in `$initial` group (#9376) by @hyf0 - add regression for CJS facade chunk merge into entry (#9351) by @IWANABETHATGUY ### ⚙️ Miscellaneous Tasks - switch prepare-release to manual dispatch with version input (#9383) by @shulaoda - migrate `@rolldown/pluginutils` to `rolldown/plugins` (#9317) by @shulaoda - deps: pin libmimalloc-sys2 to 0.1.54 (#9372) by @shulaoda - replace `igorskyflyer/action-readfile` with `cat` (#9369) by @sapphi-red - deps: update test262 submodule for tests (#9371) by @rolldown-guard[bot] - use app token for test dep update PRs (#9368) by @sapphi-red - replace some actions with gh commands (#9367) by @sapphi-red - replace action-semantic-pull-request with inline regex (#9366) by @sapphi-red - remove pull_request_target workflows (#9188) by @Boshen - deps: upgrade oxc to 0.130.0 (#9360) by @shulaoda - deps: update github actions (major) (#9348) by @renovate[bot] - deps: update github actions (#9341) by @renovate[bot] - deps: update rust crates (#9344) by @renovate[bot] - deps: update crate-ci/typos action to v1.46.1 (#9357) by @renovate[bot] - deps: update npm packages (#9343) by @renovate[bot] - deps: update pnpm to v10.33.4 (#9347) by @renovate[bot] - deps: update dependency rolldown-plugin-dts to ^0.25.0 (#9346) by @renovate[bot] - .claude: add rolldown-repl encoder, rename decode skill (#9352) by @IWANABETHATGUY - deps: update crate-ci/typos action to v1.46.0 (#9345) by @renovate[bot] - deps: update napi to v3.8.6 (#9342) by @renovate[bot] - deps: update dependency vite-plus to v0.1.20 (#9340) by @renovate[bot] - enable rollup chunking-form test (#9335) by @IWANABETHATGUY - typo: fix typo in watcher options comment (#9324) by @thescripted ### ❤️ New Contributors * @Kyujenius made their first contribution in [#9262](#9262) * @SAY-5 made their first contribution in [#9296](#9296) * @thescripted made their first contribution in [#9324](#9324) Co-authored-by: shulaoda <[email protected]>

Dunqing marked this pull request as ready for review May 8, 2026 10:16

Dunqing requested review from sapphi-red and shulaoda May 8, 2026 10:16

Dunqing changed the title ~~fix(transform): enable enum_eval for transformSync and vite TS transform~~ fix(transform): enable enum_eval for transformSync and vite TS transform May 8, 2026

Dunqing marked this pull request as draft May 8, 2026 10:18

Dunqing force-pushed the fix/transform-sync-enum-eval branch from ff3cbfd to ece7fed Compare May 8, 2026 10:20

Dunqing mentioned this pull request May 8, 2026

refactor(ecmascript): extract semantic_builder_for_transform helper #9326

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Dunqing marked this pull request as ready for review May 11, 2026 08:21

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graphite-app Bot force-pushed the fix/transform-sync-enum-eval branch from d0b9526 to ef5796f Compare May 12, 2026 08:37

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release: v1.0.1 #9384

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[Bug]: transformSync from rolldown/utils does not inline enums in the same file #9235

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fix(transform): enable `enum_eval` for `transformSync` and vite TS transform#9325

fix(transform): enable `enum_eval` for `transformSync` and vite TS transform#9325
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Dunqing commented May 8, 2026 •

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netlify Bot commented May 8, 2026 •

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codspeed-hq Bot commented May 11, 2026 •

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graphite-app Bot commented May 12, 2026 •

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