fix(check): do not suggest running with `--unstable` (#23092)

Closes #23079

5 files changed, 36 insertions, 0 deletions

diff --git a/tests/specs/check/unstable_suggestion/__test__.jsonc b/tests/specs/check/unstable_suggestion/__test__.jsonc
new file mode 100644
index 000000000..28fe022be
--- /dev/null
+++ b/tests/specs/check/unstable_suggestion/__test__.jsonc
@@ -0,0 +1,11 @@
+{
+  "steps": [{
+    "args": "check main.ts",
+    "output": "main.out",
+    "exitCode": 1
+  }, {
+    "args": "check no_default_lib.ts",
+    "output": "no_default_lib.out",
+    "exitCode": 1
+  }]
+}
diff --git a/tests/specs/check/unstable_suggestion/main.out b/tests/specs/check/unstable_suggestion/main.out
new file mode 100644
index 000000000..ba8b2800c
--- /dev/null
+++ b/tests/specs/check/unstable_suggestion/main.out
@@ -0,0 +1,10 @@
+Check file:///[WILDLINE]main.ts
+error: TS2551 [ERROR]: Property 'dlopen' does not exist on type 'typeof Deno'. Did you mean 'open'? 'Deno.dlopen' is an unstable API. Did you mean 'open'? If not, try changing the 'lib' compiler option to include 'deno.unstable' or add a triple-slash directive to the top of your entrypoint (main file): /// <reference lib="deno.unstable" />
+Deno.dlopen("path/to/lib", {});
+     ~~~~~~
+    at file:///[WILDLINE]/main.ts:5:6
+
+    'open' is declared here.
+      export function open(
+                      ~~~~
+        at asset:///lib.deno.ns.d.ts:[WILDLINE]
diff --git a/tests/specs/check/unstable_suggestion/main.ts b/tests/specs/check/unstable_suggestion/main.ts
new file mode 100644
index 000000000..02a5cfbdf
--- /dev/null
+++ b/tests/specs/check/unstable_suggestion/main.ts
@@ -0,0 +1,5 @@
+/// <reference no-default-lib="true" />
+/// <reference lib="deno.ns" />
+
+// unstable apis removed here, so should error
+Deno.dlopen("path/to/lib", {});
diff --git a/tests/specs/check/unstable_suggestion/no_default_lib.out b/tests/specs/check/unstable_suggestion/no_default_lib.out
new file mode 100644
index 000000000..1ec2ae3e5
--- /dev/null
+++ b/tests/specs/check/unstable_suggestion/no_default_lib.out
@@ -0,0 +1,5 @@
+Check file:///[WILDLINE]/no_default_lib.ts
+error: TS2304 [ERROR]: Cannot find name 'Deno'. Do you need to change your target library? Try changing the 'lib' compiler option to include 'deno.ns' or add a triple-slash directive to the top of your entrypoint (main file): /// <reference lib="deno.ns" />
+console.log(Deno);
+            ~~~~
+    at file:///[WILDLINE]/no_default_lib.ts:5:13
diff --git a/tests/specs/check/unstable_suggestion/no_default_lib.ts b/tests/specs/check/unstable_suggestion/no_default_lib.ts
new file mode 100644
index 000000000..2b3aa6dfc
--- /dev/null
+++ b/tests/specs/check/unstable_suggestion/no_default_lib.ts
@@ -0,0 +1,5 @@
+/// <reference no-default-lib="true" />
+/// <reference lib="es5" />
+/// <reference lib="dom" />
+
+console.log(Deno);