22 lines
682 B
TypeScript
22 lines
682 B
TypeScript
import type { Context } from "./context.ts";
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export type FeatureValue = boolean | string | number;
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export type FeatureRule = FeatureValue | ((ctx: Context) => FeatureValue | Promise<FeatureValue>);
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export interface FeatureFlags {
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get(name: string, ctx: Context): Promise<FeatureValue | undefined>;
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enabled(name: string, ctx: Context): Promise<boolean>;
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}
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export function defineFeatureFlags(rules: Record<string, FeatureRule>): FeatureFlags {
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return {
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async get(name, ctx) {
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const rule = rules[name];
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return typeof rule === "function" ? rule(ctx) : rule;
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},
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async enabled(name, ctx) {
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return (await this.get(name, ctx)) === true;
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},
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};
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}
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