alexion
6081e3e325
Imported as a linear vendor commit so forge rebases do not replay the upstream root tree. git-subtree-dir: third_party/pi git-subtree-split: 71023aec1546d6d677a65669c5665c0927ce0dd0
31 lines
1.0 KiB
TypeScript
31 lines
1.0 KiB
TypeScript
import type { Ctx } from "./types.ts";
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export interface Registry<V> {
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readonly name: string;
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readonly conflict: "error" | "last";
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/** Type carrier only; never set. */
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readonly value?: V;
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}
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/** `conflict: "error"` rejects two objects registering one key; `"last"` keeps the later registration. */
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export const defineRegistry = <V>(name: string, options: { conflict?: "error" | "last" } = {}): Registry<V> => ({
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name,
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conflict: options.conflict ?? "error",
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});
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export type RegistryTable<V> = ReadonlyMap<string, V>;
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export interface RegistryView<V> {
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/** Table of `ctx.codeVersion`, or of the current code version without ctx. */
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table(ctx?: Ctx): RegistryTable<V>;
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get(key: string, ctx?: Ctx): V | undefined;
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/** Called with the current table immediately and whenever a new table is installed. */
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subscribe(listener: (table: RegistryTable<V>, codeVersion: number) => void): () => void;
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}
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export interface Registration {
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readonly registry: Registry<unknown>;
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readonly key: string;
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readonly value: unknown;
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}
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