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legacy-conventions

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更新日2026年3月28日 18:14

MUST consult before writing any code related to Svelte 4 legacy features. Contains mandatory naming conventions, doc-comment format, and isolation rules for legacy code. Use this skill whenever touching on:directive, bind:this legacy syntax, Svelte 4 deprecated features, code marked LEGACY(svelte4), or when porting/implementing any feature that has both a Svelte 5 and a Svelte 4 variant. Failure to follow these conventions creates tech debt that blocks future cleanup.

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MrWaip

MrWaip/svelte-rs-2

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Legacy Feature Conventions (Svelte 4)

Legacy Svelte 4 syntax (deprecated in Svelte 5, scheduled for removal in Svelte 6) is ported with isolation in mind so it can be cleanly deleted later.

Conventions

Legacy suffix in all type/function names: OnDirectiveLegacy, gen_on_directive_legacy, build_legacy_event_handler.
LEGACY(svelte4): doc-comment on every struct, enum variant, and top-level function:
```
/// LEGACY(svelte4): on:directive syntax. Deprecated in Svelte 5, remove in Svelte 6.
pub struct OnDirectiveLegacy { ... }
```
Short inline comments use the same tag: // LEGACY(svelte4): on:directive handled separately.
Easy removal — keep legacy code in self-contained blocks/functions. Avoid mixing legacy logic into non-legacy code paths. Ideal: grep LEGACY(svelte4) -> delete all hits -> compile -> done.

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name	legacy-conventions
description	MUST consult before writing any code related to Svelte 4 legacy features. Contains mandatory naming conventions, doc-comment format, and isolation rules for legacy code. Use this skill whenever touching on:directive, bind:this legacy syntax, Svelte 4 deprecated features, code marked LEGACY(svelte4), or when porting/implementing any feature that has both a Svelte 5 and a Svelte 4 variant. Failure to follow these conventions creates tech debt that blocks future cleanup.
paths	["*/.rs"]

Legacy Feature Conventions (Svelte 4)

Legacy Svelte 4 syntax (deprecated in Svelte 5, scheduled for removal in Svelte 6) is ported with isolation in mind so it can be cleanly deleted later.

Conventions

Legacy suffix in all type/function names: OnDirectiveLegacy, gen_on_directive_legacy, build_legacy_event_handler.
LEGACY(svelte4): doc-comment on every struct, enum variant, and top-level function:
```
/// LEGACY(svelte4): on:directive syntax. Deprecated in Svelte 5, remove in Svelte 6.
pub struct OnDirectiveLegacy { ... }
```
Short inline comments use the same tag: // LEGACY(svelte4): on:directive handled separately.
Easy removal — keep legacy code in self-contained blocks/functions. Avoid mixing legacy logic into non-legacy code paths. Ideal: grep LEGACY(svelte4) -> delete all hits -> compile -> done.