feat(prettier): format hashbang (#1406)

crates/oxc_prettier/src/format/mod.rs

@@ -54,8 +54,25 @@ where
 
 impl<'a> Format<'a> for Program<'a> {
     fn format(&self, p: &mut Prettier<'a>) -> Doc<'a> {
-        block::print_block_body(p, &self.body, Some(&self.directives), false, true)
-            .unwrap_or(ss!(""))
+        let mut parts = p.vec();
+        if let Some(hashbang) = &self.hashbang {
+            parts.push(hashbang.format(p));
+            if p.is_next_line_empty(hashbang.span.end - 1) {
+                parts.push(hardline!());
+            }
+        }
+        if let Some(doc) =
+            block::print_block_body(p, &self.body, Some(&self.directives), false, true)
+        {
+            parts.push(doc);
+        }
+        Doc::Array(parts)
+    }
+}
+
+impl<'a> Format<'a> for Hashbang {
+    fn format(&self, p: &mut Prettier<'a>) -> Doc<'a> {
+        Doc::Str(self.span.source_text(p.source_text))
     }
 }
 

crates/oxc_prettier/src/format/statement.rs

@@ -4,7 +4,6 @@ use crate::{doc::Doc, hardline, Prettier};
 use oxc_span::GetSpan;
 
 use super::Format;
-use crate::util::is_next_line_empty;
 
 pub(super) fn print_statement_sequence<'a, F: Format<'a> + GetSpan>(
     p: &mut Prettier<'a>,
@@ -32,7 +31,7 @@ pub(super) fn print_statement_sequence<'a, F: Format<'a> + GetSpan>(
         if i < stmts.len() - 1 {
             parts.push(hardline!());
 
-            if is_next_line_empty(p.source_text, stmt.span()) {
+            if p.is_next_line_empty(stmt.span().end) {
                 parts.push(hardline!());
             }
         }

crates/oxc_prettier/src/lib.rs

@@ -8,7 +8,6 @@ mod format;
 mod macros;
 mod options;
 mod printer;
-mod util;
 
 use std::{iter::Peekable, vec};
 
@@ -63,4 +62,8 @@ impl<'a> Prettier<'a> {
         let trailing_comma = self.options.trailing_comma;
         trailing_comma.is_all() || (trailing_comma.is_es5() && !level_all)
     }
+
+    pub(crate) fn is_next_line_empty(&self, end: u32) -> bool {
+        self.source_text[end as usize..].chars().nth(1).is_some_and(|c| c == '\n')
+    }
 }

crates/oxc_prettier/src/util.rs

@@ -1,5 +0,0 @@
-use oxc_span::Span;
-
-pub fn is_next_line_empty(source_text: &str, span: Span) -> bool {
-    source_text.chars().nth((span.end as usize) + 1).is_some_and(|c| c == '\n')
-}

tasks/prettier_conformance/prettier.snap.md

@@ -1,4 +1,4 @@
-Compatibility: 98/881 (11.12%)
+Compatibility: 100/881 (11.35%)
 
 # Failed
 
@@ -939,10 +939,6 @@ Compatibility: 98/881 (11.12%)
 * sequence-expression/ignore.js
 * sequence-expression/parenthesized.js
 
-### shebang
-* shebang/shebang-newline.js
-* shebang/shebang.js
-
 ### source-phase-imports
 * source-phase-imports/default-binding.js
 * source-phase-imports/import-source-attributes-declaration.js