blee/strfry-policies
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Type tweaks

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Alex Gleason 2023-03-25 08:24:47 -05:00
parent 2330349ad6
commit c6c7b759e6
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1 changed files with 4 additions and 4 deletions
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src/pipeline.ts
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@ -5,16 +5,16 @@ type PolicyTuple<P extends Policy = Policy> = [policy: P, opts?: InferPolicyOpts
/** Infer opts from the policy. */ /** Infer opts from the policy. */
type InferPolicyOpts<P> = P extends Policy<infer Opts> ? Opts : never; type InferPolicyOpts<P> = P extends Policy<infer Opts> ? Opts : never;
/** Helper type for proper type inference of PolicyTuples in the pipeline. */ /** Helper type for proper type inference of PolicyTuples. */
// https://stackoverflow.com/a/75806165 // https://stackoverflow.com/a/75806165
// https://stackoverflow.com/a/54608401 // https://stackoverflow.com/a/54608401
type PolicySpread<T extends any[]> = { type Policies<T extends any[]> = {
[K in keyof T]: PolicyTuple<T[K]> | Policy<T[K]>; [K in keyof T]: PolicyTuple<T[K]> | Policy<T[K]>;
}; };
/** Processes messages through multiple policies, bailing early on rejection. */ /** Processes messages through multiple policies, bailing early on rejection. */
async function pipeline<T extends any[]>(msg: InputMessage, policies: [...PolicySpread<T>]): Promise<OutputMessage> { async function pipeline<T extends unknown[]>(msg: InputMessage, policies: [...Policies<T>]): Promise<OutputMessage> {
for (const item of policies) { for (const item of policies as (Policy | PolicyTuple)[]) {
const [policy, opts] = toTuple(item); const [policy, opts] = toTuple(item);
const result = await policy(msg, opts); const result = await policy(msg, opts);
if (result.action !== 'accept') { if (result.action !== 'accept') {