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node_modules/spawn-wrap/lib/mungers/env.js

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+'use strict';
+
+const isWindows = require("is-windows")
+const path = require("path")
+const homedir = require("../homedir")
+
+const pathRe = isWindows() ? /^PATH=/i : /^PATH=/;
+
+/**
+ * Updates the environment variables to intercept `node` commands and pass down options.
+ *
+ * @param workingDir {string} Absolute system-dependent path to the directory containing the shim files.
+ * @param options {import("../munge").InternalSpawnOptions} Original internal spawn options.
+ * @return {import("../munge").InternalSpawnOptions} Updated internal spawn options.
+ */
+function mungeEnv(workingDir, options) {
+  let pathEnv
+
+  const envPairs = options.envPairs.map((ep) => {
+    if (pathRe.test(ep)) {
+      // `PATH` env var: prefix its value with `workingDir`
+      // `5` corresponds to the length of `PATH=`
+      pathEnv = ep.substr(5)
+      const k = ep.substr(0, 5)
+      return k + workingDir + path.delimiter + pathEnv
+    } else {
+      // Return as-is
+      return ep;
+    }
+  });
+
+  if (pathEnv === undefined) {
+    envPairs.push((isWindows() ? 'Path=' : 'PATH=') + workingDir)
+  }
+  if (options.originalNode) {
+    const key = path.basename(workingDir).substr('.node-spawn-wrap-'.length)
+    envPairs.push('SW_ORIG_' + key + '=' + options.originalNode)
+  }
+
+  envPairs.push('SPAWN_WRAP_SHIM_ROOT=' + homedir)
+
+  if (process.env.SPAWN_WRAP_DEBUG === '1') {
+    envPairs.push('SPAWN_WRAP_DEBUG=1')
+  }
+
+  return {...options, envPairs};
+}
+
+module.exports = mungeEnv