BREAKING(config): make supported compilerOptions an allow list (#25432)

Deno has been using a deny list, which doesn't make sense because a lot
of these options don't even work.

Closes #25363

1 files changed, 16 insertions, 0 deletions

diff --git a/cli/args/deno_json.rs b/cli/args/deno_json.rs
index cbc33aa0b..e9ab0189f 100644
--- a/cli/args/deno_json.rs
+++ b/cli/args/deno_json.rs
@@ -2,6 +2,7 @@
 
 use std::collections::HashSet;
 
+use deno_config::deno_json::TsConfigForEmit;
 use deno_core::serde_json;
 use deno_semver::jsr::JsrDepPackageReq;
 use deno_semver::jsr::JsrPackageReqReference;
@@ -105,3 +106,18 @@ fn values_to_set<'a>(
   }
   entries
 }
+
+pub fn check_warn_tsconfig(ts_config: &TsConfigForEmit) {
+  if let Some(ignored_options) = &ts_config.maybe_ignored_options {
+    log::warn!("{}", ignored_options);
+  }
+  let serde_json::Value::Object(obj) = &ts_config.ts_config.0 else {
+    return;
+  };
+  if obj.get("experimentalDecorators") == Some(&serde_json::Value::Bool(true)) {
+    log::warn!(
+      "{} experimentalDecorators compiler option is deprecated and may be removed at any time",
+      deno_runtime::colors::yellow("Warning"),
+    );
+  }
+}