feat(prettier): print big int with lowercase (#1351)

crates/oxc_prettier/src/format/mod.rs

@@ -613,7 +613,13 @@ impl<'a> Format<'a> for NumberLiteral<'a> {
 
 impl<'a> Format<'a> for BigintLiteral {
     fn format(&self, p: &mut Prettier<'a>) -> Doc<'a> {
-        Doc::Str(self.span.source_text(p.source_text))
+        let text = self.span.source_text(p.source_text);
+        // Perf: avoid a memory allocation from `to_ascii_lowercase`.
+        if text.contains(|c: char| c.is_lowercase()) {
+            p.str(&text.to_ascii_lowercase())
+        } else {
+            Doc::Str(text)
+        }
     }
 }
 

tasks/prettier_conformance/prettier.snap.md

@@ -1,4 +1,4 @@
-Compatibility: 8/173 (4.62%)
+Compatibility: 9/173 (5.20%)
 
 # Failed
 
@@ -13,7 +13,6 @@ Compatibility: 8/173 (4.62%)
 * async
 * async-do-expressions
 * babel-plugins
-* big-int
 * binary-expressions
 * binary_math
 * bind-expressions