feat: unsetEnv -> add function (#21)

Author: Serhii Khoma

src/Node/Process.js

@@ -54,6 +54,12 @@ exports.setEnv = function (var_) {
   };
 };
 
+exports.unsetEnv = function (var_) {
+  return function () {
+    delete process.env[var_];
+  };
+};
+
 exports.exit = function (code) {
   return function () {
     process.exit(code);

src/Node/Process.purs

@@ -13,6 +13,7 @@ module Node.Process
   , getEnv
   , lookupEnv
   , setEnv
+  , unsetEnv
   , pid
   , platform
   , exit
@@ -119,6 +120,10 @@ lookupEnv k = FO.lookup k <$> getEnv
 -- | Set an environment variable.
 foreign import setEnv :: String -> String -> Effect Unit
 
+-- | Delete an environment variable.
+-- | Use case: to hide secret environment variable from child processes.
+foreign import unsetEnv :: String -> Effect Unit
+
 pid :: Pid
 pid = process.pid