swc_ecma_transforms_base 49.0.1

rust port of babel and closure compiler.
Documentation 
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use swc_atoms::atom;
use swc_ecma_parser::Syntax;

use super::*;
use crate::hygiene::Config;

// struct TsHygiene {
//     top_level_mark: Mark,
// }

// impl VisitMut for TsHygiene {
//     fn visit_mut_ident(&mut self, i: &mut Ident) {
//         if SyntaxContext::empty().apply_mark(self.top_level_mark) ==
// i.ctxt {             println!("ts_hygiene: {} is top-level", i.sym);
//             return;
//         }

//         let ctxt = format!("{:?}", i.ctxt).replace("#", "");
//         i.sym = format!("{}__{}", i.sym, ctxt).into();
//         i.span = i.span.with_ctxt(SyntaxContext::empty());
//     }

//     fn visit_mut_member_expr(&mut self, n: &mut MemberExpr) {
//         n.obj.visit_mut_with(self);
//         if n.computed {
//             n.prop.visit_mut_with(self);
//         }
//     }

//     fn visit_mut_prop_name(&mut self, n: &mut PropName) {
//         match n {
//             PropName::Computed(n) => {
//                 n.visit_mut_with(self);
//             }
//             _ => {}
//         }
//     }

//     fn visit_mut_ts_qualified_name(&mut self, q: &mut TsQualifiedName) {
//         q.left.visit_mut_with(self);
//     }
// }

fn run_test_with_config<F, V>(
    syntax: Syntax,
    tr: F,
    src: &str,
    to: &str,
    config: impl FnOnce() -> crate::hygiene::Config,
) where
    F: FnOnce() -> V,
    V: Pass,
{
    crate::tests::test_transform(syntax, |_| tr(), src, to, true, config);
}

#[test]
fn test_mark_for() {
    ::testing::run_test(false, |_, _| {
        let mark1 = Mark::fresh(Mark::root());
        let mark2 = Mark::fresh(mark1);
        let mark3 = Mark::fresh(mark2);
        let mark4 = Mark::fresh(mark3);

        let folder1 = Resolver::new(
            Scope::new(ScopeKind::Block, mark1, None),
            InnerConfig {
                handle_types: true,
                unresolved_mark: Mark::fresh(Mark::root()),
                top_level_mark: mark1,
            },
        );
        let mut folder2 = Resolver::new(
            Scope::new(ScopeKind::Block, mark2, Some(&folder1.current)),
            InnerConfig {
                handle_types: true,
                unresolved_mark: Mark::fresh(Mark::root()),
                top_level_mark: mark2,
            },
        );
        folder2
            .current
            .declared_symbols
            .insert(atom!("foo"), DeclKind::Var);

        let mut folder3 = Resolver::new(
            Scope::new(ScopeKind::Block, mark3, Some(&folder2.current)),
            InnerConfig {
                handle_types: true,
                unresolved_mark: Mark::fresh(Mark::root()),
                top_level_mark: mark3,
            },
        );
        folder3
            .current
            .declared_symbols
            .insert(atom!("bar"), DeclKind::Var);
        assert_eq!(folder3.mark_for_ref(&atom!("bar")), Some(mark3));

        let mut folder4 = Resolver::new(
            Scope::new(ScopeKind::Block, mark4, Some(&folder3.current)),
            InnerConfig {
                handle_types: true,
                unresolved_mark: Mark::fresh(Mark::root()),
                top_level_mark: mark4,
            },
        );
        folder4
            .current
            .declared_symbols
            .insert(atom!("foo"), DeclKind::Var);

        assert_eq!(folder4.mark_for_ref(&atom!("foo")), Some(mark4));
        assert_eq!(folder4.mark_for_ref(&atom!("bar")), Some(mark3));
        Ok(())
    })
    .unwrap();
}

#[test]
fn issue_1279_1() {
    run_test_with_config(
        Default::default(),
        || resolver(Mark::new(), Mark::new(), false),
        "class Foo {
            static f = 1;
            static g = Foo.f;
        }",
        "
        let Foo = class Foo {
            static f = 1;
            static g = Foo.f;
        };
        ",
        || Config {
            keep_class_names: true,
            ..Default::default()
        },
    );
}

#[test]
fn issue_1279_2() {
    run_test_with_config(
        Default::default(),
        || resolver(Mark::new(), Mark::new(), false),
        "class Foo {
            static f = 1;
            static g = Foo.f;
            method() {
                class Foo {
                    static nested = 1;
                    static nested2 = Foo.nested;
                }
            }
        }",
        "
        let Foo = class Foo {
            static f = 1;
            static g = Foo.f;
            method() {
                let Foo = class Foo {
                    static nested = 1;
                    static nested2 = Foo.nested;
                };
            }
        };
        ",
        || Config {
            keep_class_names: true,
            ..Default::default()
        },
    );
}

#[test]
fn issue_2516() {
    run_test_with_config(
        Default::default(),
        || resolver(Mark::new(), Mark::new(), false),
        "class A {
            static A = class {}
          }",
        "
        let A = class A {
            static A = class {}
          };
        ",
        || Config {
            keep_class_names: true,
            ..Default::default()
        },
    );
}