Swiftui Modernize

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name: swiftui-modernize description: Modernize existing macOS SwiftUI code by replacing deprecated APIs with verified current production patterns. license: MIT

Bundled resource root

Let <swiftui-plugin-root> be the absolute plugin directory two levels above this SKILL.md. Resolve that path before running commands or opening shared references. When these instructions say swiftui-ctx, invoke <swiftui-plugin-root>/scripts/swiftui-ctx; do not assume the command is on PATH.

swiftui-modernize — fix deprecated/stale SwiftUI

Operates on code that already exists: it finds deprecated and outdated SwiftUI and migrates it to what shipping macOS apps use today, using swiftui-ctx as the source of truth. (Writing new code → swiftui-examples. Scaffolding a whole pattern → macos-app-patterns.)

swiftui-ctx = <swiftui-plugin-root>/scripts/swiftui-ctx (or swiftui-ctx on PATH). It self-builds + self-locates the catalog.

The rule

Do not guess whether an API is current. Check it. A call that compiles can still be deprecated — the catalog knows (it's flagged across 200–1,100 real repos). Announce: "Using swiftui-modernize to verify against production."

Workflow

1. Find candidates. Scan the target file/diff for SwiftUI symbols (modifiers, types, wrappers).
2. Check each. swiftui-ctx deprecated <api> → it returns deprecated: true/false, the replacement, and a note. Run swiftui-ctx deprecated (no arg) once to see the full deprecated-in-the-wild list to scan against.
3. Get the real migration. For each deprecated hit, swiftui-ctx lookup <replacement> → the modern idiom + file --smart a real example, then rewrite.
4. Report, don't silently change: list each old → new with the permalink evidence, then apply.

The common migrations are tabulated in references/migrations.md (read it for the fast path).

Behavioral rules

• Never leave a deprecated API in place once flagged — migrate it or call out why you can't.
• Prefer the replacement the tool gives; confirm the new call's shape via lookup <replacement> consensus.
• Modernity isn't only deprecation: prefer @Observable over ObservableObject, NavigationStack/Split over NavigationView, the Settings scene + MenuBarExtra for macOS — swiftui-ctx lookup shows current adoption.
• Pair with sosumi.ai (the doc: link) to confirm the replacement's signature before rewriting.

Errors → actions

3 not-found → swiftui-ctx search "<broader>". 5 no catalog → STOP, tell the user, don't fabricate a migration.

References

File	Read when
references/migrations.md	You want the common deprecated→modern macOS SwiftUI migration table up front.