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feat: add ErrorProps to generated types #16272

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Merged
dummdidumm merged 1 commit into from
Jul 8, 2026
Merged

feat: add ErrorProps to generated types #16272

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5 changes: 5 additions & 0 deletions .changeset/brave-canyons-crash.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'@sveltejs/kit': minor
---

feat: add `ErrorProps` to generated types
15 changes: 5 additions & 10 deletions packages/kit/src/core/sync/write_types/index.js
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Expand Up @@ -231,7 +231,9 @@ function update_types(config, routes, route, root, to_delete = new Set()) {
'type OptionalUnion<U extends Record<string, any>, A extends keyof U = U extends U ? keyof U : never> = U extends unknown ? { [P in Exclude<A, keyof U>]?: never } & U : never;',

// Re-export `Snapshot` from @sveltejs/kit — in future we could use this to infer <T> from the return type of `snapshot.capture`
'export type Snapshot<T = any> = Kit.Snapshot<T>;'
'export type Snapshot<T = any> = Kit.Snapshot<T>;',

'export type ErrorProps = { error: App.Error };'

@dummdidumm dummdidumm Jul 8, 2026

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Is there a way to make it only appear for +error.svelte files?

@Rich-Harris Rich-Harris Jul 8, 2026

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Not without having multiple files per route (./$types.d.ts, ./$error-types.d.ts, ./$layout-types.d.ts), but we already decided against that when we created PageProps alongside LayoutProps

);
}

Expand Down Expand Up @@ -263,15 +265,8 @@ function update_types(config, routes, route, root, to_delete = new Set()) {

if (route.leaf.server) {
exports.push(
'export type Action<OutputData extends Record<string, any> | void = Record<string, any> | void> = Kit.Action<RouteParams, OutputData, RouteId>'
);
exports.push(
'export type Actions<OutputData extends Record<string, any> | void = Record<string, any> | void> = Kit.Actions<RouteParams, OutputData, RouteId>'
);
}

if (route.leaf.server) {
exports.push(
'export type Action<OutputData extends Record<string, any> | void = Record<string, any> | void> = Kit.Action<RouteParams, OutputData, RouteId>',
'export type Actions<OutputData extends Record<string, any> | void = Record<string, any> | void> = Kit.Actions<RouteParams, OutputData, RouteId>',
'export type PageProps = { params: RouteParams; data: PageData; form: ActionData }'
);
} else {
Expand Down
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