From 3e7c0a0bc9ac2dbb531484444b918ae8805b6da5 Mon Sep 17 00:00:00 2001
From: Markus Felten <Markus.Felten@gmx.de>
Date: Fri, 5 Apr 2019 19:46:44 +0200
Subject: [PATCH] fix: declare args of firts() as nullable

---
 src/functions.mjs     | 2 +-
 tests/basics-test.mjs | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/functions.mjs b/src/functions.mjs
index 16aacaf5..c4ce1e40 100644
--- a/src/functions.mjs
+++ b/src/functions.mjs
@@ -151,7 +151,7 @@ export const functions = {
   },
 
   first: {
-    arguments: ["object|number"],
+    arguments: ["object|number|undefined"],
     returns: "object?",
     apply: (context, args) => {
       args = args.filter(e => e !== undefined && e.value !== undefined);
diff --git a/tests/basics-test.mjs b/tests/basics-test.mjs
index d80da9bc..0b89c0ad 100644
--- a/tests/basics-test.mjs
+++ b/tests/basics-test.mjs
@@ -104,6 +104,7 @@ test("length (string)", async t => t.is(await expand("${length('abc')}"), 3));
 test("length (array)", async t => t.is(await expand("${length([1,2,3])}"), 3));
 
 test("first", async t => t.is(await expand("${first(1,2,3)}"), 1));
+test.only("first missing", async t => t.is(await expand("${first(env.MISSING,'b')}"), 'b'));
 
 test("split", async t =>
   t.deepEqual(await expand("${split('1,2,3,4',',')}"), ["1", "2", "3", "4"]));