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import {  Cache,  extname,} from "./deps.ts";
export interface CrossOptions {  name: string;  urls: { [os in typeof Deno.build.os]?: string };  policy?: CachePolicy;  cache?: string;}
export interface SingleOptions {  name: string;  url: string;  policy?: CachePolicy;  cache?: string;}
export type Options = CrossOptions | SingleOptions;
export enum CachePolicy {  NONE,  STORE,}
interface UnstableCore {  ops: () => { [key: string]: number };  setAsyncHandler(rid: number, handler: (response: Uint8Array) => void): void;  dispatch(    rid: number,    // deno-lint-ignore no-explicit-any    msg: any,    buf?: ArrayBufferView,  ): Uint8Array | undefined;}
export class PlugError extends Error {  constructor(message: string) {    super(message);
    this.name = "PlugError";    this.stack = undefined;  }}
export class PlugImportError extends Error {  constructor(message: string) {    super(message);
    this.name = "PlugImportError";    this.stack = undefined;  }}
export async function prepare(options: Options): Promise<number> {  const directory = options.cache ?? Cache.options.directory;  const policy = options.policy === CachePolicy.NONE    ? Cache.RELOAD_POLICY    : undefined;  Cache.configure({ directory });
  let url;  if ("urls" in options) {    url = options.urls[os];    if (!url) {      throw new PlugImportError(`URL for "${os}" platform was not provided.`);    }  } else {    url = options.url;  }
  const pref = prefixes[os];  const ext = extensions[os];
  url = Object.values(extensions).includes(extname(url))    ? url    : `${url}${(url.endsWith("/") ? "" : "/")}${pref}${options.name}${ext}`;
  const plug = Cache.namespace("plug");  const file = await plug.fetch(url, policy);
  return Deno.openPlugin(file.path);}
export function getOpId(op: string): number {  const id = core.ops()[op];
  if (!(id > 0)) {    throw new PlugError(`Bad op id for "${op}"`);  }
  return id;}
// deno-lint-ignore ban-ts-comment// @ts-ignoreexport const core = Deno.core as UnstableCore;export const os = Deno.build.os;export const extensions: { [os in typeof Deno.build.os]: string } = {  darwin: ".dylib",  linux: ".so",  windows: ".dll",};export const prefixes: { [os in typeof Deno.build.os]: string } = {  darwin: "lib",  linux: "lib",  windows: "",};