feat(codegen): add new lines to TSTypeParameterDeclaration (#5853)

crates/oxc_codegen/src/gen.rs

@@ -2790,9 +2790,29 @@ impl<'a> Gen for TSClassImplements<'a> {
 
 impl<'a> Gen for TSTypeParameterDeclaration<'a> {
     fn gen(&self, p: &mut Codegen, ctx: Context) {
-        p.print_str("<");
+        let is_multi_line = self.params.len() >= 2;
-        p.print_list(&self.params, ctx);
+        p.print_char(b'<');
-        p.print_str(">");
+        if is_multi_line {
+            p.indent();
+        }
+        for (index, item) in self.params.iter().enumerate() {
+            if index != 0 {
+                p.print_comma();
+            }
+            if is_multi_line {
+                p.print_soft_newline();
+                p.print_indent();
+            } else if index != 0 {
+                p.print_soft_space();
+            }
+            item.print(p, ctx);
+        }
+        if is_multi_line {
+            p.print_soft_newline();
+            p.dedent();
+            p.print_indent();
+        }
+        p.print_char(b'>');
     }
 }
 

crates/oxc_codegen/tests/integration/snapshots/ts.snap

@@ -180,3 +180,33 @@ export @x declare abstract class C {}
 div<T>``
 ----------
 div<T>``;
+
+########## 30
+export type Component<Props = any> = Foo;
+----------
+export type Component<Props = any> = Foo;
+
+########## 31
+
+export type Component<
+  Props = any,
+  RawBindings = any,
+  D = any,
+  C extends ComputedOptions = ComputedOptions,
+  M extends MethodOptions = MethodOptions,
+  E extends EmitsOptions | Record<string, any[]> = {},
+  S extends Record<string, any> = any,
+> =
+  | ConcreteComponent<Props, RawBindings, D, C, M, E, S>
+  | ComponentPublicInstanceConstructor<Props>
+
+----------
+export type Component<
+	Props = any,
+	RawBindings = any,
+	D = any,
+	C extends ComputedOptions = ComputedOptions,
+	M extends MethodOptions = MethodOptions,
+	E extends EmitsOptions | Record<string, any[]> = {},
+	S extends Record<string, any> = any
+> = ConcreteComponent<Props, RawBindings, D, C, M, E, S> | ComponentPublicInstanceConstructor<Props>;

crates/oxc_codegen/tests/integration/ts.rs

@@ -37,6 +37,20 @@ fn ts() {
         "d = x satisfies y;",
         "export @x declare abstract class C {}",
         "div<T>``",
+        "export type Component<Props = any> = Foo;",
+        "
+export type Component<
+  Props = any,
+  RawBindings = any,
+  D = any,
+  C extends ComputedOptions = ComputedOptions,
+  M extends MethodOptions = MethodOptions,
+  E extends EmitsOptions | Record<string, any[]> = {},
+  S extends Record<string, any> = any,
+> =
+  | ConcreteComponent<Props, RawBindings, D, C, M, E, S>
+  | ComponentPublicInstanceConstructor<Props>
+"
     ];
 
     snapshot("ts", &cases);