**Description:**
- `Pass`: `FnMut(&mut Program)`.
**Breaking Changes:**
- `chain!`: Use a tuple instead. You can replace all `chain!(` with `(` with IDE feature and it will work.
- `chain!` with 13 or more args: Use nested tuples for items after 13th element.
**Related issue:**
- Related to https://github.com/swc-project/swc/issues/9601
**Description:**
This PR addresses the issue described in https://github.com/swc-project/swc/issues/8713
**BREAKING CHANGE:**
Will break unit tests that use `fold_module`/`visit_module`/`visit_mut_module` if the visitor is intended to work for both modules and scripts instead of using `fold_program`/`visit_program`/`visit_mut_program`.
When creating visitors, you should use `fold_program`/`visit_program`/`visit_mut_program` if you simply want to visit the top-level node.
When creating tests, the input source code will be parsed using `parse_program` by default. If you need to parse it as a `Module`, you can use `module: Some(true)` in `FixtureTestConfig` (or with `test!(module, ..)`), which will parse it as a `Program::Module`, or `Some(false)` for `Program::Script`. `None` will use `parse_program` (`parse_program` will auto-detect the underlying type).
**Description:**
`EsConfig` and `TsConfig` sound like a general configuration for the whole language, while actually it's only about parsing.
To avoid a breaking change, I created type aliases that will work without changing the code, while warning the users.
**Related issue:**
- Closes#9089.
