fix(parser): report err on missing function body in expression

Author: camc314

crates/oxc_parser/src/js/function.rs

@@ -121,7 +121,11 @@ impl<'a> ParserImpl<'a> {
         let type_parameters = self.parse_ts_type_parameters();
         let (this_param, params) = self.parse_formal_parameters(func_kind, param_kind);
         let return_type = if self.is_ts { self.parse_ts_return_type_annotation() } else { None };
-        let body = if self.at(Kind::LCurly) { Some(self.parse_function_body()) } else { None };
+        let body = if self.at(Kind::LCurly) || func_kind == FunctionKind::Expression {
+            Some(self.parse_function_body())
+        } else {
+            None
+        };
         self.ctx =
             self.ctx.and_in(ctx.has_in()).and_await(ctx.has_await()).and_yield(ctx.has_yield());
         if !self.is_ts && body.is_none() {

tasks/coverage/misc/fail/oxc-14944.ts

@@ -0,0 +1 @@
+const x = function foo();

tasks/coverage/snapshots/parser_misc.snap

@@ -1,7 +1,7 @@
 parser_misc Summary:
 AST Parsed     : 49/49 (100.00%)
 Positive Passed: 49/49 (100.00%)
-Negative Passed: 92/92 (100.00%)
+Negative Passed: 93/93 (100.00%)
 
   × Cannot assign to 'arguments' in strict mode
    ╭─[misc/fail/arguments-eval.ts:1:10]
@@ -2899,6 +2899,13 @@ Negative Passed: 92/92 (100.00%)
  6 │ }
    ╰────
 
+  × Expected `{` but found `;`
+   ╭─[misc/fail/oxc-14944.ts:1:25]
+ 1 │ const x = function foo();
+   ·                         ┬
+   ·                         ╰── `{` expected
+   ╰────
+
   × Unexpected token
    ╭─[misc/fail/oxc-169.js:2:1]
  1 │ 1<(V=82<<t-j0<(V=$<LBI<(V=ut<I<(V=$<LBI<(V=uIV=82<<t-j0<(V=$<LBI<(V=ut<I<(V=$<LBI<(V<II>