support download on install

README.md

@@ -23,6 +23,13 @@ npm i -g runme
 runme list
 ```
 
+By default this package downloads the [Runme CLI](https://github.com/stateful/runme) when the interface is used for the first time. You can download it after running `npm install` by setting the `RUNME_DOWNLOAD_ON_INSTALL` environment flag. You can also modify the Runme version that is being installed by setting `RUNME_VERSION`, e.g.:
+
+```sh
+RUNME_DOWNLOAD_ON_INSTALL=1 RUNME_VERSION=1.0.0 npm install runme
+npx runme --version
+```
+
 ## Usage
 
 The module exposes the following methods:

package.json

@@ -35,6 +35,7 @@
     "clean": "rimraf dist",
     "compile": "tsc -p ./tsconfig.json",
     "copy": "cp src/cjs/package.json dist/cjs/package.json",
+    "postinstall": "node ./postInstall.js",
     "release": "release-it --github.release --ci --npm.skipChecks --no-git.requireCleanWorkingDir",
     "test": "run-s test:*",
     "test:nodejs": "vitest --config ./vitest.config.ts",

postInstall.js

@@ -0,0 +1,9 @@
+import fs from 'node:fs/promises'
+
+const isCompiled = await fs.access('./dist').then(() => true, () => false)
+if (isCompiled && process.env.RUNME_DOWNLOAD_ON_INSTALL) {
+  const { download } = await import('./dist/installer.js')
+  const version = process.env.RUNME_VERSION || 'latest'
+  console.log(`Download Runme ${version}`)
+  await download(version)
+}