init

mc_test/node_modules/cross-env/src/command.js

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+const path = require('path')
+const isWindows = require('./is-windows')
+
+module.exports = commandConvert
+
+/**
+ * Converts an environment variable usage to be appropriate for the current OS
+ * @param {String} command Command to convert
+ * @param {Object} env Map of the current environment variable names and their values
+ * @param {boolean} normalize If the command should be normalized using `path`
+ * after converting
+ * @returns {String} Converted command
+ */
+function commandConvert(command, env, normalize = false) {
+  if (!isWindows()) {
+    return command
+  }
+  const envUnixRegex = /\$(\w+)|\${(\w+)}/g // $my_var or ${my_var}
+  const convertedCmd = command.replace(envUnixRegex, (match, $1, $2) => {
+    const varName = $1 || $2
+    // In Windows, non-existent variables are not replaced by the shell,
+    // so for example "echo %FOO%" will literally print the string "%FOO%", as
+    // opposed to printing an empty string in UNIX. See kentcdodds/cross-env#145
+    // If the env variable isn't defined at runtime, just strip it from the command entirely
+    return env[varName] ? `%${varName}%` : ''
+  })
+  // Normalization is required for commands with relative paths
+  // For example, `./cmd.bat`. See kentcdodds/cross-env#127
+  // However, it should not be done for command arguments.
+  // See https://github.com/kentcdodds/cross-env/pull/130#issuecomment-319887970
+  return normalize === true ? path.normalize(convertedCmd) : convertedCmd
+}