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A feature-usage scanner can recognize Vue, Svelte, and Astro without putting framework-specific rules into its shared analysis logic—but the exact implementation depends on the scanner’s extension points. The project details behind the headline are not identified here, so it would be misleading to claim that a particular scanner was changed or that its core was left untouched. Astro’s documented renderer and integration APIs offer a concrete example of the extension pattern and the decisions a scanner implementation needs to make.

What “supporting a framework” needs to mean

Recognizing a framework is more than noticing a filename. A useful scanner needs to discover the relevant files, interpret their syntax or configuration appropriately, and report feature usage in a form the rest of the tool understands. Which steps belong in an adapter—and which belong in shared analysis—depends on the scanner’s design.

A practical boundary is to let framework-specific adapters identify and interpret their inputs, then pass normalized results to a stable shared analysis interface. This is an architectural recommendation, not a verified description of the unnamed scanner. Astro documents a related pattern: its renderers are integrations that teach Astro to detect and render component syntax it does not handle natively. Astro Renderer API

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Use an extension boundary for framework-specific handling

Astro’s integration model illustrates how a host can expose an extension point rather than hard-code every framework into its central machinery. Astro integrations can add functionality and hook into the build process and development server; its official integrations include Vue and Svelte. Working with integrations

For a scanner, the analogous design is an adapter or plugin interface with a clear contract: how the framework is selected, what files it accepts, and what normalized findings it returns. Keep shared analysis responsible for common behavior, and isolate framework-specific parsing or recognition. Whether this can be done without changing the scanner’s core cannot be established without its code or change record.

Decide how the scanner identifies Vue, Svelte, and Astro

File extensions are a useful signal, but not always enough. Astro’s framework guide says Astro recognizes framework components based on file extension and that an Astro project can combine components from different frameworks, including Vue and Svelte. It also warns that projects using multiple JSX frameworks may require additional configuration. Front-end frameworks

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A scanner should therefore make its discovery rules explicit rather than assume one project equals one framework. A robust design can consider file extensions alongside project configuration and, where necessary, content. Mixed-framework fixtures help expose cases where one extension or global setting would misclassify files.

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Check compatibility by framework version

Framework support can change across integration versions, so a scanner’s compatibility claims need a version boundary. The cited Astro documentation labels @astrojs/svelte as version 9.0.0 and says it enables Svelte 5; it directs users who need Svelte 3 or 4 to @astrojs/svelte@5.

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