flow like the river

BACK_BACK/node_modules/parcel-bundler/lib/utils/pipeSpawn.js

@@ -0,0 +1,33 @@
+"use strict";
+
+const spawn = require('cross-spawn');
+
+const logger = require('@parcel/logger');
+
+function pipeSpawn(cmd, params, opts) {
+  const cp = spawn(cmd, params, Object.assign({
+    env: Object.assign({
+      FORCE_COLOR: logger.color,
+      npm_config_color: logger.color ? 'always' : '',
+      npm_config_progress: true
+    }, process.env, {
+      NODE_ENV: null
+    } // Passing NODE_ENV through causes strange issues with yarn
+    )
+  }, opts));
+  cp.stdout.setEncoding('utf8').on('data', d => logger.writeRaw(d));
+  cp.stderr.setEncoding('utf8').on('data', d => logger.writeRaw(d));
+  return new Promise((resolve, reject) => {
+    cp.on('error', reject);
+    cp.on('close', function (code) {
+      if (code !== 0) {
+        return reject(new Error(cmd + ' failed.'));
+      }
+
+      logger.clear();
+      return resolve();
+    });
+  });
+}
+
+module.exports = pipeSpawn;