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backend/node_modules/chokidar-cli/utils.js

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+'use strict';
+
+const {spawn} = require('child_process');
+
+// Try to resolve path to shell.
+// We assume that Windows provides COMSPEC env variable
+// and other platforms provide SHELL env variable
+const SHELL_PATH = process.env.SHELL || process.env.COMSPEC;
+const EXECUTE_OPTION = process.env.COMSPEC !== undefined && process.env.SHELL === undefined ? '/c' : '-c';
+
+// XXX: Wrapping tos to a promise is a bit wrong abstraction. Maybe RX suits
+// better?
+function run(cmd, opts) {
+    if (!SHELL_PATH) {
+        // If we cannot resolve shell, better to just crash
+        throw new Error('$SHELL environment variable is not set.');
+    }
+
+    opts = {
+        pipe: true,
+        cwd: undefined,
+        callback(child) { // eslint-disable-line no-unused-vars
+            // Since we return promise, we need to provide
+            // this callback if one wants to access the child
+            // process reference
+            // Called immediately after successful child process
+            // spawn
+        }, ...opts};
+
+    return new Promise((resolve, reject) => {
+        let child;
+
+        try {
+            child = spawn(SHELL_PATH, [EXECUTE_OPTION, cmd], {
+                cwd: opts.cwd,
+                stdio: opts.pipe ? 'inherit' : null
+            });
+        } catch (error) {
+            return reject(error);
+        }
+
+        opts.callback(child);
+
+        function errorHandler(err) {
+            child.removeListener('close', closeHandler);
+            reject(err);
+        }
+
+        function closeHandler(exitCode) {
+            child.removeListener('error', errorHandler);
+            resolve(exitCode);
+        }
+
+        child.once('error', errorHandler);
+        child.once('close', closeHandler);
+    });
+}
+
+module.exports = {
+    run
+};