fix(formatter): improve formatting for default type on type parameters (#15893)

Follow-up prettier/prettier#18041

Author: Dunqing

crates/oxc_formatter/src/write/type_parameters.rs

@@ -7,7 +7,7 @@ use crate::{
     ast_nodes::{AstNode, AstNodes},
     format_args,
     formatter::{
-        Buffer, Format, FormatError, FormatResult, Formatter, GroupId,
+        Buffer, Format, FormatError, FormatResult, Formatter, GroupId, group_id,
         prelude::*,
         separated::FormatSeparatedIter,
         trivia::{DanglingIndentMode, FormatDanglingComments},
@@ -53,7 +53,17 @@ impl<'a> FormatWrite<'a> for AstNode<'a, TSTypeParameter<'a>> {
             )?;
         }
         if let Some(default) = &self.default() {
-            write!(f, [space(), "=", space(), default])?;
+            let group_id = f.group_id("default");
+            write!(
+                f,
+                [
+                    space(),
+                    "=",
+                    group(&indent(&soft_line_break_or_space())).with_group_id(Some(group_id)),
+                    line_suffix_boundary(),
+                    indent_if_group_breaks(&default, group_id)
+                ]
+            )?;
         }
         Ok(())
     }

tasks/prettier_conformance/snapshots/prettier.ts.snap.md

@@ -1,4 +1,4 @@
-ts compatibility: 559/601 (93.01%)
+ts compatibility: 562/601 (93.51%)
 
 # Failed
 
@@ -38,9 +38,6 @@ ts compatibility: 559/601 (93.01%)
 | typescript/non-null/optional-chain.ts | 💥 | 72.22% |
 | typescript/object-multiline/multiline.ts | 💥✨ | 23.21% |
 | typescript/property-signature/consistent-with-flow/comments.ts | 💥 | 80.00% |
-| typescript/type-params/18041.ts | 💥 | 43.75% |
-| typescript/type-params/constraints-and-default-2.ts | 💥 | 97.60% |
-| typescript/type-params/constraints-and-default.ts | 💥 | 87.32% |
 | typescript/union/inlining.ts | 💥 | 97.78% |
 | typescript/union/union-parens.ts | 💥 | 92.59% |
 | typescript/union/comments/18106.ts | 💥 | 90.48% |