From de6d0c66d3762db52dce180abe0bf3709b02bd51 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B8rn?= <rster2002dev@gmail.com>
Date: Tue, 22 Jun 2021 15:33:50 +0200
Subject: [PATCH] Add a more descriptive message for the error generated by an
 empty shorthand attribute (#6217)

Added error message "empty-attribute-shorthand" for when the shorthand attribute is empty,
giving a more explicit error for #6086
---
 src/compiler/parse/state/tag.ts                        |  7 +++++++
 .../samples/error-empty-attribute-shorthand/error.json | 10 ++++++++++
 .../error-empty-attribute-shorthand/input.svelte       |  1 +
 3 files changed, 18 insertions(+)
 create mode 100644 test/parser/samples/error-empty-attribute-shorthand/error.json
 create mode 100644 test/parser/samples/error-empty-attribute-shorthand/input.svelte

diff --git a/src/compiler/parse/state/tag.ts b/src/compiler/parse/state/tag.ts
index 799124b2bd..1a18bd3115 100644
--- a/src/compiler/parse/state/tag.ts
+++ b/src/compiler/parse/state/tag.ts
@@ -330,6 +330,13 @@ function read_attribute(parser: Parser, unique_names: Set<string>) {
 			parser.allow_whitespace();
 			parser.eat('}', true);
 
+			if (name === null) {
+				parser.error({
+					code: 'empty-attribute-shorthand',
+					message: 'Attribute shorthand cannot be empty'
+				}, start);
+			}
+
 			check_unique(name);
 
 			return {
diff --git a/test/parser/samples/error-empty-attribute-shorthand/error.json b/test/parser/samples/error-empty-attribute-shorthand/error.json
new file mode 100644
index 0000000000..f465b3468a
--- /dev/null
+++ b/test/parser/samples/error-empty-attribute-shorthand/error.json
@@ -0,0 +1,10 @@
+{
+    "code": "empty-attribute-shorthand",
+    "message": "Attribute shorthand cannot be empty",
+    "start": {
+        "line": 1,
+        "column": 6,
+        "character": 6
+    },
+    "pos": 6
+}
\ No newline at end of file
diff --git a/test/parser/samples/error-empty-attribute-shorthand/input.svelte b/test/parser/samples/error-empty-attribute-shorthand/input.svelte
new file mode 100644
index 0000000000..2e137c8c6d
--- /dev/null
+++ b/test/parser/samples/error-empty-attribute-shorthand/input.svelte
@@ -0,0 +1 @@
+<span {}></span>
\ No newline at end of file