Implement console.groupCollapsed (#1452)

This implementation of groupCollapsed is intentionally different
from the spec defined by whatwg. See the conversation in #1355
and #1363.

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/console_group_warn.ts b/tests/console_group_warn.ts
new file mode 100644
index 000000000..8ab871338
--- /dev/null
+++ b/tests/console_group_warn.ts
@@ -0,0 +1,20 @@
+console.warn("1");
+console.group();
+console.warn("2");
+console.group();
+console.warn("3");
+console.groupEnd();
+console.warn("4");
+console.groupEnd();
+console.warn("5");
+
+console.groupCollapsed();
+console.warn("6");
+console.group();
+console.warn("7");
+console.groupEnd();
+console.warn("8");
+console.groupEnd();
+
+console.warn("9");
+console.warn("10");