test(minifier): fix broken tests (#8722)

crates/oxc_ecmascript/src/side_effects/may_have_side_effects.rs

@@ -4,14 +4,15 @@ use oxc_ast::ast::*;
 ///
 /// Ported from [closure-compiler](https://github.com/google/closure-compiler/blob/f3ce5ed8b630428e311fe9aa2e20d36560d975e2/src/com/google/javascript/jscomp/AstAnalyzer.java#L94)
 pub trait MayHaveSideEffects {
-    fn is_global_reference(&self, ident: &IdentifierReference<'_>) -> bool {
-        matches!(ident.name.as_str(), "undefined" | "NaN" | "Infinity")
-    }
+    fn is_global_reference(&self, ident: &IdentifierReference<'_>) -> bool;
 
     fn expression_may_have_side_efffects(&self, e: &Expression<'_>) -> bool {
         match e {
             // Reference read can have a side effect.
-            Expression::Identifier(ident) => self.is_global_reference(ident),
+            Expression::Identifier(ident) => match ident.name.as_str() {
+                "NaN" | "Infinity" | "undefined" => !self.is_global_reference(ident),
+                _ => true,
+            },
             Expression::NumericLiteral(_)
             | Expression::BooleanLiteral(_)
             | Expression::StringLiteral(_)

crates/oxc_minifier/src/peephole/remove_dead_code.rs

@@ -751,7 +751,7 @@ mod test {
         test("try {} catch (e) { foo() } finally { var x = bar() }", "{ var x = bar() }");
         test("try {} finally { let x = foo() }", "{ let x = foo() }");
         test("try {} catch (e) { foo() } finally { let x = bar() }", "{ let x = bar();}");
-        test("try {} catch () { } finally {}", "");
+        test("try {} catch (e) { } finally {}", "");
     }
 
     #[test]
@@ -800,7 +800,7 @@ mod test {
     #[test]
     fn test_remove_empty_static_block() {
         test("class Foo { static {}; foo }", "class Foo { foo }");
-        test_same("class Foo { static { foo() }");
+        test_same("class Foo { static { foo() } }");
     }
 
     #[test]

crates/oxc_minifier/src/peephole/statement_fusion.rs

@@ -290,7 +290,7 @@ mod test {
         // Never fuse a statement into a block that contains let/const/class declarations, or you risk
         // colliding variable names. (unless the AST is normalized).
         test("a; {b;}", "a,b");
-        test("a; {b; var a = 1;}", "{b; var a = 1;}");
+        test("a; {b; var a = 1;}", "{a, b; var a = 1;}");
         test_same("a; { b; let a = 1; }");
         test_same("a; { b; const a = 1; }");
         test_same("a; { b; class a {} }");

crates/oxc_minifier/src/peephole/substitute_alternate_syntax.rs

@@ -940,7 +940,7 @@ mod test {
         test("function f(){return undefined;}", "function f(){}");
         test("function f(){if(a()){return undefined;}}", "function f(){if(a())return}");
         test_same("function a(undefined) { return undefined; }");
-        test_same("function f(){return foo()");
+        test_same("function f(){return foo()}");
 
         // `return undefined` has a different semantic in async generator function.
         test("function foo() { return undefined }", "function foo() { }");
@@ -1414,7 +1414,7 @@ mod test {
     #[test]
     fn test_fold_arrow_function_return() {
         test("const foo = () => { return 'baz' }", "const foo = () => 'baz'");
-        test("const foo = () => { foo; return 'baz' }", "const foo = () => 'baz'");
+        test("const foo = () => { foo; return 'baz' }", "const foo = () => (foo, 'baz')");
     }
 
     #[test]

crates/oxc_minifier/src/tester.rs

@@ -1,6 +1,6 @@
 use oxc_allocator::Allocator;
 use oxc_codegen::{CodeGenerator, CodegenOptions};
-use oxc_parser::Parser;
+use oxc_parser::{ParseOptions, Parser};
 use oxc_span::SourceType;
 
 use crate::{CompressOptions, Compressor};
@@ -18,7 +18,15 @@ pub fn test(source_text: &str, expected: &str) {
 pub fn run(source_text: &str, options: Option<CompressOptions>) -> String {
     let allocator = Allocator::default();
     let source_type = SourceType::mjs();
-    let mut program = Parser::new(&allocator, source_text, source_type).parse().program;
+    let ret = Parser::new(&allocator, source_text, source_type)
+        .with_options(ParseOptions {
+            allow_return_outside_function: true,
+            ..ParseOptions::default()
+        })
+        .parse();
+    assert!(!ret.panicked, "{source_text}");
+    assert!(ret.errors.is_empty(), "{source_text}");
+    let mut program = ret.program;
     if let Some(options) = options {
         Compressor::new(&allocator, options).build(&mut program);
     }