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Narrowing Element based on arg usage #1030

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Narrowing Element based on arg usage #1030

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1176bdb
Failing tests for generic component signature that should narrow the …
NullVoxPopuli Jan 6, 2026
6ec6848
Add more failing tests
NullVoxPopuli Jan 7, 2026
8d18711
More tests, more exploration
NullVoxPopuli Jan 8, 2026
d83fb2d
SVG test was invalid, fixed
NullVoxPopuli Jan 9, 2026
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17 changes: 13 additions & 4 deletions packages/template/-private/dsl/resolve.d.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import { DirectInvokable, InvokableInstance, Invoke, InvokeDirect } from '../integration';
import { DirectInvokable, InvokableInstance, Invoke, InvokeDirect, UnwrapNamedArgs } from '../integration';
import { ResolveOrReturn } from './types';

/*
Expand Down Expand Up @@ -32,9 +32,18 @@ import { ResolveOrReturn } from './types';
*/

export declare function resolve<T extends DirectInvokable>(item: T): T[typeof InvokeDirect];
export declare function resolve<Args extends unknown[], Instance extends InvokableInstance>(
item: (abstract new (...args: Args) => Instance) | null | undefined,
): (...args: Parameters<Instance[typeof Invoke]>) => ReturnType<Instance[typeof Invoke]>;
export declare function resolve<
Args extends any[],
Instance extends InvokableInstance>(
item: (abstract new (...args: Args) => Instance) | null | undefined,
):
(...args: Parameters<NoInfer<Instance>[typeof Invoke]>) => ReturnType<NoInfer<Instance>[typeof Invoke]>;


export declare function resolveComponent<Instance extends InvokableInstance, Args = Parameters<Instance[typeof Invoke]>>(
item: (abstract new (...args: Args) => Instance) | null | undefined,
args: Args
): <Args extends UnwrapNamedArgs<infer _Args>>(...args: _Args) => ReturnType<Instance[typeof Invoke]>;

/*
* A mustache like `{{this.foo}}` might either return a plain value like a string
Expand Down
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