feat: add postinstall script

src/postinstall.ts

@@ -0,0 +1,20 @@
+import { execSync } from 'child_process';
+import { platform as _platform, arch as _arch } from 'os';
+import { handleError } from './lib/error-handler';
+
+const platform = _platform();
+const arch = _arch();
+
+const lookupTable: { [key: string]: string } = {
+  'win32-x64': 'npm install --os=win32 --cpu=x64 sharp',
+  'linux-x64': 'npm install --os=linux --cpu=x64 sharp',
+  'darwin-x64': 'npm install --os=darwin --cpu=x64 sharp'
+};
+
+const key = `${platform}-${arch}`;
+const command = lookupTable[key] || 'npm install sharp';
+
+handleError(() => {
+  execSync(command, { stdio: 'inherit' });
+  console.log('Sharp successfully installed.');
+});