Add node modules and compiled JavaScript from main

.gitignore

@@ -1,5 +1,3 @@
-node_modules
 
 .DS_Store
 .idea
-lib/

lib/exec-child.js

@@ -0,0 +1,39 @@
+if (require.main !== module) {
+  throw new Error('This file should not be required');
+}
+
+var childProcess = require('child_process');
+var fs = require('fs');
+
+var paramFilePath = process.argv[2];
+
+var serializedParams = fs.readFileSync(paramFilePath, 'utf8');
+var params = JSON.parse(serializedParams);
+
+var cmd = params.command;
+var execOptions = params.execOptions;
+var pipe = params.pipe;
+var stdoutFile = params.stdoutFile;
+var stderrFile = params.stderrFile;
+
+var c = childProcess.exec(cmd, execOptions, function (err) {
+  if (!err) {
+    process.exitCode = 0;
+  } else if (err.code === undefined) {
+    process.exitCode = 1;
+  } else {
+    process.exitCode = err.code;
+  }
+});
+
+var stdoutStream = fs.createWriteStream(stdoutFile);
+var stderrStream = fs.createWriteStream(stderrFile);
+
+c.stdout.pipe(stdoutStream);
+c.stderr.pipe(stderrStream);
+c.stdout.pipe(process.stdout);
+c.stderr.pipe(process.stderr);
+
+if (pipe) {
+  c.stdin.end(pipe);
+}