From 8cc7a4ea92da9f16759294b84a32adb3aa40227b Mon Sep 17 00:00:00 2001
From: Tomasz Pluskiewicz <tpluscode@users.noreply.github.com>
Date: Mon, 15 Jan 2024 15:58:35 +0100
Subject: [PATCH] fix: ignore prefixes

---
 .changeset/fast-rings-tie.md | 5 +++++
 packages/env/lib/Dataset.ts  | 6 +++++-
 2 files changed, 10 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/fast-rings-tie.md

diff --git a/.changeset/fast-rings-tie.md b/.changeset/fast-rings-tie.md
new file mode 100644
index 0000000..03f68ae
--- /dev/null
+++ b/.changeset/fast-rings-tie.md
@@ -0,0 +1,5 @@
+---
+"@zazuko/env": patch
+---
+
+`Dataset#serialize` would fail with some parsers when unrecognized prefix was used
diff --git a/packages/env/lib/Dataset.ts b/packages/env/lib/Dataset.ts
index 8b6c6d3..ecb753c 100644
--- a/packages/env/lib/Dataset.ts
+++ b/packages/env/lib/Dataset.ts
@@ -105,7 +105,11 @@ export function createConstructor(env: Environment<FormatsFactory>): DatasetCtor
             return { ...map, [prefix[0]]: prefix[1] }
           }
 
-          return { ...map, [prefix]: knownPrefixes[prefix] }
+          if (prefix in knownPrefixes) {
+            return { ...map, [prefix]: knownPrefixes[prefix] }
+          }
+
+          return map
         }, {}),
       }))
     }