decode javascript object as maps

2 files changed, 19 insertions, 1 deletions

diff --git a/src/gleam_stdlib.mjs b/src/gleam_stdlib.mjs
index 112007f..4f54c4d 100644
--- a/src/gleam_stdlib.mjs
+++ b/src/gleam_stdlib.mjs
@@ -673,8 +673,14 @@ export function decode_result(data) {
   return Result.isResult(data) ? new Ok(data) : decoder_error("Result", data);
 }
 
+function decode_object_to_map(data) {
+  return typeof data === 'object' && data !== null && !Array.isArray(data)
+    ? new Ok(new Map(Object.entries(data)))
+    : decoder_error("Map", data);
+}
+
 export function decode_map(data) {
-  return data instanceof Map ? new Ok(data) : decoder_error("Map", data);
+  return data instanceof Map ? new Ok(data) : decode_object_to_map(data);
 }
 
 export function decode_option(data, decoder) {
diff --git a/test/gleam/dynamic_test.gleam b/test/gleam/dynamic_test.gleam
index 0caf8c5..fb425f5 100644
--- a/test/gleam/dynamic_test.gleam
+++ b/test/gleam/dynamic_test.gleam
@@ -744,6 +744,18 @@ pub fn map_test() {
   |> dynamic.from
   |> dynamic.map(dynamic.string, dynamic.int)
   |> should.equal(Error([DecodeError(expected: "Map", found: "Int", path: [])]))
+
+  []
+  |> dynamic.from
+  |> dynamic.map(dynamic.string, dynamic.int)
+  |> should.equal(Error([DecodeError(expected: "Map", found: "List", path: [])]))
+
+  fn() { Nil }
+  |> dynamic.from
+  |> dynamic.map(dynamic.string, dynamic.int)
+  |> should.equal(Error([
+    DecodeError(expected: "Map", found: "Function", path: []),
+  ]))
 }
 
 pub fn shallow_list_test() {