Create some files

src/install/index.ts

@@ -0,0 +1,17 @@
+import { setFailed } from '@actions/core'
+import { getInputs } from '../inputs'
+import runSelfInstaller from './run'
+
+export { runSelfInstaller }
+
+export async function install() {
+  const { error, status } = await runSelfInstaller(getInputs())
+
+  if (error) return setFailed(error)
+
+  if (status) {
+    return setFailed(`Something does wrong, self-installer exits with code ${status}`)
+  }
+}
+
+export default install

src/install/run.ts

@@ -0,0 +1,18 @@
+import { spawnSync } from 'child_process'
+import { downloadSelfInstaller } from '../self-installer'
+import { Inputs } from '../inputs'
+
+export async function runSelfInstaller(inputs: Inputs) {
+  return spawnSync('node', {
+    env: {
+      PNPM_VERSION: inputs.version,
+      PNPM_DEST: inputs.dest,
+      PNPM_BIN_DEST: inputs.binDest,
+      PNPM_REGISTRY: inputs.registry,
+    },
+    input: await downloadSelfInstaller(),
+    stdio: 'inherit',
+  })
+}
+
+export default runSelfInstaller