feat: modernize mobile sdk build pipeline (#877)

* Add tsup config and postbuild shims

* cr feedback

packages/mobile-sdk-alpha/scripts/postBuild.mjs

@@ -0,0 +1,76 @@
+import { mkdirSync, readFileSync, writeFileSync } from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+import { shimConfigs } from './shimConfigs.js';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const DIST = path.resolve(__dirname, '..', 'dist');
+
+// Read version from package.json
+const packageJsonPath = path.resolve(__dirname, '..', 'package.json');
+const packageJson = JSON.parse(readFileSync(packageJsonPath, 'utf8'));
+
+// Write package.json files for module type resolution
+try {
+  // Ensure directories exist before writing files
+  mkdirSync(path.join(DIST, 'esm'), { recursive: true });
+  mkdirSync(path.join(DIST, 'cjs'), { recursive: true });
+
+  writeFileSync(path.join(DIST, 'esm', 'package.json'), JSON.stringify({ type: 'module' }, null, 4));
+  writeFileSync(path.join(DIST, 'cjs', 'package.json'), JSON.stringify({ type: 'commonjs' }, null, 4));
+} catch (error) {
+  console.error('Failed to write module type package.json files:', error.message);
+  console.error('Target paths:', {
+    esm: path.join(DIST, 'esm', 'package.json'),
+    cjs: path.join(DIST, 'cjs', 'package.json'),
+  });
+  process.exit(1);
+}
+
+// Create a package.json in dist root for Metro
+const distPackageJson = {
+  name: '@selfxyz/mobile-sdk-alpha',
+  version: packageJson.version,
+  type: 'module',
+  exports: {
+    '.': './esm/index.js',
+    './browser': './esm/browser.js',
+  },
+};
+try {
+  writeFileSync(path.join(DIST, 'package.json'), JSON.stringify(distPackageJson, null, 4));
+} catch (error) {
+  console.error('Failed to write dist package.json:', error.message);
+  console.error('Target path:', path.join(DIST, 'package.json'));
+  process.exit(1);
+}
+
+// Helper to create shims for Metro
+function createShim(shimPath, targetPath, name) {
+  try {
+    const shimDir = path.join(DIST, shimPath);
+    mkdirSync(shimDir, { recursive: true });
+
+    const cjsTargetPath = targetPath.replace('/esm/', '/cjs/').replace('.js', '.cjs');
+    const dtsTarget = targetPath.replace('.js', '');
+
+    writeFileSync(
+      path.join(shimDir, 'index.js'),
+      `// Shim file to help Metro resolve @selfxyz/mobile-sdk-alpha/${name}\nmodule.exports = require('${cjsTargetPath}');`,
+    );
+    writeFileSync(
+      path.join(shimDir, 'index.d.ts'),
+      `// Shim file to help Metro resolve @selfxyz/mobile-sdk-alpha/${name} types\nexport * from "${dtsTarget}";`,
+    );
+  } catch (error) {
+    console.error(`Failed to create shim for ${name}:`, error.message);
+    console.error('Shim path:', path.join(DIST, shimPath));
+    process.exit(1);
+  }
+}
+
+// Create all shims from configuration
+shimConfigs.forEach(({ shimPath, targetPath, name }) => {
+  createShim(shimPath, targetPath, name);
+});

packages/mobile-sdk-alpha/scripts/shimConfigs.js

@@ -0,0 +1,2 @@
+// Shim configurations for Metro compatibility
+export const shimConfigs = [{ shimPath: 'browser', targetPath: '../esm/browser.js', name: 'browser' }];