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import type { Predicate } from "./is.ts";import { inspect } from "./inspect.ts";
/** * A type that has metadata. */export type WithMetadata<T> = {  __unknownutil_metadata: T;};
/** * Get typeof the metadata */export type GetMetadata<T> = T extends WithMetadata<infer M> ? M : never;
/** * Get metadata from the given value */export function getMetadata<T>(v: unknown): T | undefined {  if (v == null) return undefined;  // deno-lint-ignore no-explicit-any  return (v as any).__unknownutil_metadata;}
/** * Metadata of a predicate factory function. */export type PredicateFactoryMetadata = {  name: string;  args: unknown[];};
/** * Set metadata to a predicate factory function. */export function setPredicateFactoryMetadata<  P extends Predicate<unknown>,  M extends PredicateFactoryMetadata,>(  pred: P,  metadata: M,): P & WithMetadata<M> {  let cachedName: string | undefined;  return Object.defineProperties(pred, {    __unknownutil_metadata: {      value: metadata,      configurable: true,    },    name: {      get: () => {        if (cachedName) return cachedName;        const { name, args } = metadata;        cachedName = `${name}(${args.map((v) => inspect(v)).join(", ")})`;        return cachedName;      },    },  }) as P & WithMetadata<M>;}
/** * Get metadata from a predicate factory function. */export function getPredicateFactoryMetadata<M extends PredicateFactoryMetadata>(  v: WithMetadata<M>,): M {  return getMetadata(v) as M;}