feat(snapshotting): Add module-based preview filtering#260
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cameroncooke merged 1 commit intoApr 29, 2026
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Allow consumers to include or exclude previews by module name via new `snapshotPreviewModules()` and `excludedSnapshotPreviewModules()` overrides on the `PreviewFilters` protocol, mirrored by `SNAPSHOT_PREVIEW_MODULES` and `EXCLUDED_SNAPSHOT_PREVIEW_MODULES` launch environment variables. Module names are matched exactly against the prefix of each preview type name (e.g. "MyModule" in "MyModule.MyView_Previews"), giving multi-module projects a coarse-grained filter without enumerating individual previews. Add a MultiModuleDemo example covering the new filters and unit tests for the module matching helpers.
NicoHinderling
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Apr 28, 2026
cameroncooke
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Add
snapshotPreviewModules()andexcludedSnapshotPreviewModules()overrides on thePreviewFiltersprotocol, plus matchingSNAPSHOT_PREVIEW_MODULES/EXCLUDED_SNAPSHOT_PREVIEW_MODULESlaunch environment variables, so multi-module projects can opt previews in or out by module without enumerating every preview type.Module names are matched exactly against the leading component of each preview type's fully-qualified name (e.g.
MyModuleinMyModule.MyView_Previews), giving a coarse-grained filter that mirrors how Swift namespaces previews. Inclusion and exclusion lists compose with the existing per-preview filters, and an empty list means "no filter" so existing consumers see no behavior change.A new
Examples/MultiModuleDemoproject exercises the filters across three SwiftUI modules and pairs withModuleFilterAssertionTeststo verify the matching helpers under the documented launch-env scenarios. The README is updated to describe the new APIs and env vars.Refs EME-1043