# ChangeLog: v1.3.81

* [**CHANGELOG.md**](https://github.com/swc-project/swc/blob/15d3900f6074e86a052836b7d03490f5067a55e3/CHANGELOG.md#1381---2023-08-30)
    
* [**Full ChangeLog**](https://github.com/swc-project/swc/milestone/438?closed=1)
    

---

# Bugfixes

## for codegen of `yield`

* [https://github.com/swc-project/swc/pull/7858](https://github.com/swc-project/swc/pull/7858)
    

The fix was quite trivial.

## for explicit resource management

* [https://github.com/swc-project/swc/pull/7881](https://github.com/swc-project/swc/pull/7881)
    

Previously, the transforms for explicit resource management proposal were not applied.

## for block scoping

* [https://github.com/swc-project/swc/pull/7888](https://github.com/swc-project/swc/pull/7888)
    

The fix was quite trivial.

## for `jsc.paths`

* [https://github.com/swc-project/swc/pull/7892](https://github.com/swc-project/swc/pull/7892)
    

SWC now does not create an absolute path on Windows. Previously, if the JavaScript package passed a non-UNC absolute path as `jsc.baseUrl`, SWC used absolute paths in the output.

## for miniifer

* [https://github.com/swc-project/swc/pull/7876](https://github.com/swc-project/swc/pull/7876)
    

The code change is ridiculous, but it fixed a bug.

# New features

## Support for import attributes

* [https://github.com/swc-project/swc/pull/7868](https://github.com/swc-project/swc/pull/7868)
    

You can enable this for EcmaScript by setting `jsc.parser.importAttributes` to `true` , and for TypeScript this is unconditionally enabled.

# Performance improvements

## `memchr` update

* [https://github.com/swc-project/swc/pull/7891](https://github.com/swc-project/swc/pull/7891)
    

SWC will now use SIMD on arm64, including Apple Silicon for `memchr`.

# Experiments

## New experimental option

### `disableBuiltinTransformsForInternalTesting`

* [https://github.com/swc-project/swc/pull/7873](https://github.com/swc-project/swc/pull/7873)
    

I added `jsc.experimental.disableBuiltinTransformsForInternalTesting` to allow applying only Wasm plugins to input files.

```javascript
       const { code } = await swc.transform(
            `
        const hello: Type = () => {
            console.log('hello');
        };
        `,
            {
                jsc: {
                    parser: {
                        syntax: "typescript",
                    },
                    experimental: {
                        disableBuiltinTransformsForInternalTesting: true,
                    },
                },
                minify: false,
            }
        );
```

## `swc-info`

* [https://github.com/swc-project/swc/pull/7871](https://github.com/swc-project/swc/pull/7871)
    
* [https://github.com/swc-project/swc/pull/7872](https://github.com/swc-project/swc/pull/7872)
    

You can run `npx swc-info@latest -y` to provide the necessary information to the team while reporting an issue.

```bash
    Operating System:
        Platform: darwin
        Arch: arm64
        Machine Type: arm64
        Version: Darwin Kernel Version 22.5.0: Thu Jun  8 22:22:20 PDT 2023; root:xnu-8796.121.3~7/RELEASE_ARM64_T6000
        CPU: (10 cores)
            Models: Apple M1 Max

    Binaries:
        Node: 18.16.0
        npm: 9.5.1
        Yarn: 1.22.19
        pnpm: 8.3.1

    Relevant Packages:
        @swc/core: 1.3.18
        @swc/helpers: 0.4.11
        @swc/types: N/A
        typescript: 4.8.4

    SWC Config:
        output: N/A
        .swcrc path: N/A

    Next.js info:
        output: N/A

```