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feat: TC39 decorator proposal support (#22040)

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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>
This commit is contained in:
Bartek Iwańczuk 2024-01-24 14:16:23 +01:00 • committed by GitHub
parent aac0ad32bd
commit b66f5ed00e
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16 changed files with 145 additions and 32 deletions
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26
cli/args/mod.rs
View file

@ -158,10 +158,8 @@ pub fn ts_config_to_emit_options(
_ => (false, false, false, false),
};
deno_ast::EmitOptions {
// TODO(bartlomieju): change it to default to `false` and only enable
// if tsconfig.json enabled experimental decorators
use_ts_decorators: true,
use_decorators_proposal: false,
use_ts_decorators: options.experimental_decorators,
use_decorators_proposal: !options.experimental_decorators,
emit_metadata: options.emit_decorator_metadata,
imports_not_used_as_values,
inline_source_map: options.inline_source_map,
@ -1088,10 +1086,26 @@ impl CliOptions {
&self,
config_type: TsConfigType,
) -> Result<TsConfigForEmit, AnyError> {
deno_config::get_ts_config_for_emit(
let result = deno_config::get_ts_config_for_emit(
config_type,
self.maybe_config_file.as_ref(),
)
);
match result {
Ok(mut ts_config_for_emit) => {
if matches!(self.flags.subcommand, DenoSubcommand::Bundle(..)) {
// For backwards compatibility, force `experimentalDecorators` setting
// to true.
*ts_config_for_emit
.ts_config
.0
.get_mut("experimentalDecorators")
.unwrap() = serde_json::Value::Bool(true);
}
Ok(ts_config_for_emit)
}
Err(err) => Err(err),
}
}
pub fn resolve_inspector_server(&self) -> Option<InspectorServer> {