Check for webpack binary path before proceeding to start the server

Author: mesaugat

cli.js

@@ -1,11 +1,24 @@
 #!/usr/bin/env node
 
-const path = require('path');
-const { spawn } = require('child_process');
+const fs = require('fs')
+const path = require('path')
+const { spawn } = require('child_process')
 
-const webpackConfig = path.resolve(__dirname, 'webpack.config.js')
+const webpackConfigPath = path.resolve(__dirname, 'webpack.config.js')
+let webpackBinPath = path.resolve(__dirname, 'node_modules/webpack/bin/webpack.js')
 
-spawn(`${__dirname}/node_modules/webpack/bin/webpack.js serve --config ${webpackConfig} --open`, [], {
+if (!fs.existsSync(webpackBinPath)) {
+  // when using newer versions of npx, node modules are not inside swift-react folder
+  webpackBinPath = path.resolve(__dirname, '../webpack/bin/webpack.js')
+}
+
+if (!fs.existsSync(webpackBinPath)) {
+  console.log(`\nCouldn't find webpack binary to start webpack server. Please raise an issue at https://github.com/mesaugat/swift-react/issues`)
+
+  process.exit(1)
+}
+
+spawn(`${webpackBinPath} serve --config ${webpackConfigPath} --open`, [], {
   shell: true,
   stdio: 'inherit'
-});
+})