1 files changed, 9 insertions, 7 deletions
diff --git a/u/process/env.ts b/u/process/env.ts
index e80ec4a..c3ae800 100644
--- a/u/process/env.ts
+++ b/u/process/env.ts
@@ -1,10 +1,12 @@
 import { Either, type IEither } from "@emprespresso/utils";
 
 export const getRequiredEnv = (name: string): IEither<Error, string> =>
-  Either.fromFailable(() => {
-    const value = Deno.env.get(name); // could throw when no permission.
-    if (!value) {
-      throw new Error(`environment variable "${name}" is required D:`);
-    }
-    return value;
-  });
+  Either
+    .fromFailable<Error, string | undefined>(() => Deno.env.get(name)) // could throw when no permission.
+    .flatMap((v) =>
+      (v &&
+        Either.right(v)) ||
+      Either.left(
+        new Error(`environment variable "${name}" is required D:`),
+      )
+    );