feat: TC39 decorator proposal support (#22040)

This commit adds support for [TC39 Decorator
Proposal](https://github.com/tc39/proposal-decorators).

These decorators are only available in transpiled sources - ie.
non-JavaScript files (because of lack of support in V8).

This entails that "experimental TypeScript decorators" are not available
by default
and require to be configured, with a configuration like this:
```
{
  "compilerOptions": {
    "experimentalDecorators": true
  }
}
```


Closes https://github.com/denoland/deno/issues/19160

---------

Signed-off-by: Bartek Iwańczuk <biwanczuk@gmail.com>
Co-authored-by: crowlkats <crowlkats@toaxl.com>
Co-authored-by: Divy Srivastava <dj.srivastava23@gmail.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/cli/tests/testdata/run/runtime_decorators.ts b/cli/tests/testdata/run/runtime_decorators.ts
index 5da109110..40a26bbd4 100644
--- a/cli/tests/testdata/run/runtime_decorators.ts
+++ b/cli/tests/testdata/run/runtime_decorators.ts
@@ -1,5 +1,5 @@
 // deno-lint-ignore-file
-function A() {
+function a() {
   console.log("@A evaluated");
   return function (
     target: any,
@@ -15,7 +15,7 @@ function A() {
   };
 }
 
-function B() {
+function b() {
   console.log("@B evaluated");
   return function (
     target: any,
@@ -32,8 +32,8 @@ function B() {
 }
 
 class C {
-  @A()
-  @B()
+  @a()
+  @b()
   static test() {
     console.log("C.test() called");
   }