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Make it possible to type context and props for LoadInput and LoadOutput #1447

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merged 6 commits into from
May 31, 2021
Merged

Make it possible to type context and props for LoadInput and LoadOutput #1447

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2bb165d
Make it possible to type context and props for LoadInput and LoadOutput
May 14, 2021
c8f60a2
convert to two args (input, output) with named params
May 18, 2021
14b843b
adjust changelog
dummdidumm May 18, 2021
fe8e343
make input/output types public; convert them to positional generics
May 25, 2021
0da7e3e
Merge branch 'master' into load-type-generics
May 27, 2021
837e032
Merge branch 'master' into load-type-generics
dummdidumm May 31, 2021
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5 changes: 5 additions & 0 deletions .changeset/tricky-rockets-agree.md
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@@ -0,0 +1,5 @@
---
'@sveltejs/kit': patch
---

Make it possible to type context, page params and props for LoadInput and LoadOutput
4 changes: 2 additions & 2 deletions packages/kit/types/endpoint.d.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import { Headers, ParameterizedBody } from './helper';
import { Headers, MaybePromise, ParameterizedBody } from './helper';

export type ServerRequest<Locals = Record<string, any>, Body = unknown> = {
method: string;
Expand Down Expand Up @@ -29,4 +29,4 @@ export type EndpointOutput = {

export type RequestHandler<Locals = Record<string, any>, Body = unknown> = (
request: ServerRequest<Locals, Body>
) => void | EndpointOutput | Promise<EndpointOutput>;
) => void | MaybePromise<EndpointOutput>;
5 changes: 5 additions & 0 deletions packages/kit/types/helper.d.ts
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Expand Up @@ -17,3 +17,8 @@ export type ParameterizedBody<Body = unknown> = Body extends FormData
// 'set-cookie' is a `string[]` (or at least `string | string[]`)
// but this can't happen until TypeScript 4.3
export type Headers = Record<string, string>;

export type MaybePromise<T> = T | Promise<T>;
export type InferValue<T, Key extends keyof T, Default> = T extends Record<Key, infer Val>
? Val
: Default;
8 changes: 4 additions & 4 deletions packages/kit/types/hooks.d.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import { BaseBody, Headers } from './helper';
import { BaseBody, Headers, MaybePromise } from './helper';
import { ServerRequest } from './endpoint';

export type Incoming = {
Expand All @@ -18,10 +18,10 @@ export type ServerResponse = {
};

export type GetSession<Locals = Record<string, any>, Session = any> = {
(request: ServerRequest<Locals>): Session | Promise<Session>;
(request: ServerRequest<Locals>): MaybePromise<Session>;
};

export type Handle<Locals = Record<string, any>> = (input: {
request: ServerRequest<Locals>;
render: (request: ServerRequest<Locals>) => ServerResponse | Promise<ServerResponse>;
}) => ServerResponse | Promise<ServerResponse>;
render: (request: ServerRequest<Locals>) => MaybePromise<ServerResponse>;
}) => MaybePromise<ServerResponse>;
40 changes: 28 additions & 12 deletions packages/kit/types/page.d.ts
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Original file line number Diff line number Diff line change
@@ -1,30 +1,46 @@
export type LoadInput = {
page: Page;
import { MaybePromise, InferValue } from './helper';

export type LoadInput<
T extends { context?: Record<string, any>; pageParams?: Record<string, string> } = {}
> = {
page: Page<InferValue<T, 'pageParams', Record<string, string>>>;
fetch: (info: RequestInfo, init?: RequestInit) => Promise<Response>;
session: any;
context: Record<string, any>;
context: InferValue<T, 'context', Record<string, any>>;
};

export type ErrorLoadInput = LoadInput & {
export type ErrorLoadInput<
T extends { context?: Record<string, any>; pageParams?: Record<string, string> } = {}
> = LoadInput<T> & {
status: number;
error: Error;
};

export type LoadOutput = {
export type LoadOutput<
T extends { context?: Record<string, any>; props?: Record<string, any> } = {}
> = {
status?: number;
error?: string | Error;
redirect?: string;
props?: Record<string, any> | Promise<Record<string, any>>;
context?: Record<string, any>;
props?: InferValue<T, 'props', Record<string, any>>;
context?: InferValue<T, 'context', Record<string, any>>;
maxage?: number;
};

/* Publicized Types */
export type Load = (input: LoadInput) => LoadOutput | Promise<LoadOutput>;
export type ErrorLoad = (input: ErrorLoadInput) => LoadOutput | Promise<LoadOutput>;
export type Page = {
// Publicized Types
export type Load<
Input extends { context?: Record<string, any>; pageParams?: Record<string, string> } = {},
Output extends { context?: Record<string, any>; props?: Record<string, any> } = {}
> = (input: LoadInput<Input>) => MaybePromise<LoadOutput<Output>>;

export type ErrorLoad<
Input extends { context?: Record<string, any>; pageParams?: Record<string, string> } = {},
Output extends { context?: Record<string, any>; props?: Record<string, any> } = {}
> = (input: ErrorLoadInput<Input>) => MaybePromise<LoadOutput<Output>>;

export type Page<Params extends Record<string, string> = Record<string, string>> = {
host: string;
path: string;
params: Record<string, string>;
params: Params;
query: URLSearchParams;
};