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fix(no-cycle): detect cycles through side-effect imports - #538
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`import './foo'` and `import {} from './foo'` have no specifiers, so
`specifiers.every(...)` was vacuously true and no-cycle skipped them as
type-only imports. A cycle made only of side-effect imports was never
reported.
The unambiguous-module prefilter also missed `import './foo'`, so on the
AST route (e.g. `.ts` files) a module whose only module syntax is a
side-effect import was treated as non-module and its imports were lost.
The lexer route already handled such files.
Fixes #480
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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| Check name | Status | Explanation |
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| Description Check |  |
Check skipped - CodeRabbit’s high-level summary is enabled. |
| Title check | |
The title clearly and concisely describes the main change: fixing no-cycle detection for cycles involving side-effect imports. |
| Linked Issues check | |
Issue #480 requires no-cycle to report the mutual imports in the Svelte reproduction. src/rules/no-cycle.ts now keeps side-effect and empty-specifier imports as runtime imports. `src/utils/unambig… |
| Out of Scope Changes check | |
The source changes, fixtures, tests, and changeset support side-effect cycle detection or its module-detection coverage. The supplied pull request evidence shows no unrelated changes. |
| Docstring Coverage | |
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 7… |
Full details: Linked Issues check
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Explanation
Issue
#480requiresno-cycleto report the mutual imports in the Svelte reproduction.src/rules/no-cycle.tsnow keeps side-effect and empty-specifier imports as runtime imports.src/utils/unambiguous.tsnow recognizes side-effect import syntax for AST module detection. The addedno-cycletests cover JavaScript and TypeScript cycle cases. These changes satisfy the linked coding requirement.
Full details: Docstring Coverage
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Explanation
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 7 files.
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Review comments at @src/utils/unambiguous.ts:
- Line 3: Update the pattern in unambiguous.ts so import statements with
comments before the module specifier, including side-effect imports like import
/* comment */ './foo', pass the prefilter and reach ModuleInfo AST analysis.
Preserve the existing matching behavior for other import and export forms.
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📒 Files selected for processing: 7
.changeset/no-cycle-side-effect-imports.mdsrc/rules/no-cycle.tssrc/utils/unambiguous.tstest/fixtures/cycles/es6/depth-one-side-effect.jstest/fixtures/cycles/typescript-depth-one-side-effect.tstest/rules/no-cycle.spec.tstest/utils/module-info.spec.ts
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…lter `import /* comment */ './foo'` did not pass the prefilter, so on the AST route the file was not treated as a module. Co-Authored-By: Claude Opus 5.5 <[email protected]>
commit: |
Fixes #480
no-cyclenever reported a cycle when the import in the linted file was a side-effect import (import './b'orimport {} from './b'). The repro in #480 is two files that import each other this way.Two causes:
no-cycleskips type-only imports withimporter.specifiers.every(s => s.importKind === 'type'). A side-effect import has no specifiers, soeveryistrueand the import was skipped as type-only. It now needs at least one specifier.isMaybeUnambiguousModuleprefilter didn't matchimport './b', so on the AST route (for example.tsfiles) a module whose only module syntax is a side-effect import was treated as non-module and its imports were lost. The lexer route already treats such files as modules, so this makes the two routes agree.named,namespaceandexportsee these files as modules too now; the full parse still decides, so a file that only mentionsimport '...'in a comment or string is rejected as before.The same
[].every(...)problem was confirmed upstream in import-js/eslint-plugin-import#3147.Projects with cycles made only of side-effect imports will start getting
no-cycleerrors, which is the point of the fix.import {} from './b'now counts as a runtime import, like the comment in the import collection code already says; TypeScript can drop such an import when compiling, so that one may be debatable.Tests: four
no-cycleinvalid cases (side-effect import,import {}, a side-effect cycle on the lexer route, and one through a.tsfile on the AST route) plus a row in the unambiguous regex table. All five fail without the change.I used Claude Code to write this change.
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