deno-which

Finds the path to the specified command. Works in Deno and Node.js.

# Deno
> deno add @david/which

# Node.js
> npm install @dsherret/which

import { which, whichSync } from "@dsherret/which";

const pathToCurl = await which("curl");

Custom Environment

If you want to use this with an fake or in memory environment, then you can provide a custom environment as the second parameter.

For example:

const pathToCurl = await which("curl", {
  isWindows: true,
  async stat(filePath: string): Promise<{ isFile: boolean }> {
    // implement this
  },
  statSync(filePath: string): { isFile: boolean } {
    // implement this
  },
  // lstat/readLink are used as a fallback on Windows when stat throws
  // with EACCES, to resolve Windows Store app execution aliases (and
  // user-created symlinks pointing at them)
  async lstat(
    filePath: string,
  ): Promise<{ isFile: boolean; isSymlink: boolean }> {
    // implement this
  },
  lstatSync(filePath: string): { isFile: boolean; isSymlink: boolean } {
    // implement this
  },
  async readLink(filePath: string): Promise<string> {
    // implement this
  },
  readLinkSync(filePath: string): string {
    // implement this
  },
  env(key: string): string | undefined {
    // implement getting an environment variable
  },
  // optional method for requesting broader permissions for a folder
  requestPermission(folderPath: string): void {
    Deno.permissions.requestSync({
      name: "read",
      path: folderPath,
    });
  },
});