feat(unstable/fmt): move yaml formatting behind unstable flag (#24848)

This moves YAML formatting behind an unstable flag for Deno 1.46. This
will make it opt-in to start and then we can remove the flag to make it
on by default in version of Deno after that.

This can be specified by doing `deno fmt --unstable-yaml` or by
specifying the following in a deno.json file:

```json
{
  "unstable": ["fmt-yaml"]
}
```

1 files changed, 17 insertions, 1 deletions

diff --git a/cli/lsp/language_server.rs b/cli/lsp/language_server.rs
index 62cbd58dd..314c9ec14 100644
--- a/cli/lsp/language_server.rs
+++ b/cli/lsp/language_server.rs
@@ -92,6 +92,7 @@ use crate::args::CaData;
 use crate::args::CacheSetting;
 use crate::args::CliOptions;
 use crate::args::Flags;
+use crate::args::UnstableFmtOptions;
 use crate::factory::CliFactory;
 use crate::file_fetcher::FileFetcher;
 use crate::graph_util;
@@ -1361,6 +1362,16 @@ impl Inner {
         .clone();
       fmt_options.use_tabs = Some(!params.options.insert_spaces);
       fmt_options.indent_width = Some(params.options.tab_size as u8);
+      let maybe_workspace = self
+        .config
+        .tree
+        .data_for_specifier(&specifier)
+        .map(|d| &d.member_dir.workspace);
+      let unstable_options = UnstableFmtOptions {
+        yaml: maybe_workspace
+          .map(|w| w.has_unstable("fmt-yaml"))
+          .unwrap_or(false),
+      };
       let document = document.clone();
       move || {
         let format_result = match document.maybe_parsed_source() {
@@ -1378,7 +1389,12 @@ impl Inner {
               .map(|ext| file_path.with_extension(ext))
               .unwrap_or(file_path);
             // it's not a js/ts file, so attempt to format its contents
-            format_file(&file_path, document.content(), &fmt_options)
+            format_file(
+              &file_path,
+              document.content(),
+              &fmt_options,
+              &unstable_options,
+            )
           }
         };
         match format_result {