swc: [@swc/core@1.3.7 + ] index out of bounds: the len is 1 but the index is 1

Describe the bug

thread '<unnamed>' panicked at 'index out of bounds: the len is 1 but the index is 1', /Users/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/swc_common-0.29.6/src/syntax_pos/hygiene.rs

env: typescript v4.8.4

in @swc/core v1.3.6 ok

Input code

// 
class HuluCssModules extends Visitor {
  visitImportDeclaration(expression) {
     return expression;
  }      
}

exports.default = HuluCssModules;



### Config

```json
{
            test: /\.(js|mjs|jsx|ts|tsx)$/,
            exclude: /node_modules/,
            use: {
                loader: require.resolve('swc-loader'),
                options: {
                    parseMap: true,
                    sync: true,
                    jsc: {
                        parser: {
                            syntax: 'typescript',
                            tsx: true
                        },
                        transform: {
                            react: {
                                runtime: 'automatic',
                                throwIfNamespace: true,
                                development: devMode,
                                useBuiltins: false,
                                refresh: true
                            }
                        }
                    },
                    plugin: (m) => new HuluCssModules().visitProgram(m)
                }
            }
        }



### Playground link

_No response_

### Expected behavior

compile no error

### Actual behavior

_No response_

### Version

v1.3.10

### Additional context

_No response_

About this issue

Original URL
State: closed
Created 2 years ago
Comments: 33 (14 by maintainers)

Commits related to this issue

Remove plugin use for now There is a bug when using a plugin: https://github.com/swc-project/swc/issues/6255 — committed to rene-leanix/swc-jest-preset-angular by rene-leanix a year ago

Most upvoted comments

So what is actually the issue here? I’m seeing the “index out of bounds” in my build and came here to find a fix or at least a workaround. I read “this encourages wrong usage”, so I would like to know what I’m doing wrong. I also read “Fix would be trivial” so I assume a root cause is found, but I don’t see it, is is the default exports? How would a PR to fix this look like?

bxt on Dec 5, 2022

For anyone still encountering the issue: it may not be the issue from @swc/core itself; it may be due to the plugins.

I tried the 1.3.58 version of @swc/core, and there is no export {xxx}; in my project, but I still got the “index out of bounds” message. But when I pasted my code to the SWC playground, it worked well. There’s also no issue when I use 1.3.7 version in the playground.

Then I removed all plugins in my project and found it worked… After several tries, I found that both options.plugin and options.jsc.experimental.plugins can cause this issue.

I’m not familiar with Rust so I didn’t find the root cause, but removing all SWC plugins is an acceptable solution for me.

RexSkz on May 17, 2023

JS plugins will be removed in v2, and it’s deprecated.

kdy1 on Jun 23, 2023

I get this with a blank plugin in JS just extending Visitor (class MyPlugin extends Visitor { }). How does this “encourage wrong usage”? The only way to not cause this error (on my machine) is to not use any JS plugins.

CanadaHonk on Jun 8, 2023

I didn’t close it because I would accept PR

kdy1 on Nov 30, 2022

Just to add also

this cause the error

import {  display  } from './display'


const randomId = () => { 
  return display()
}

export { display }
export { randomId }

Solution

import {  display  } from './display'

export const randomId = () => { 
  return display()
}

export { display } from './display'

aelbore on Nov 30, 2022

@rene-leanix transform(Module) will also be removed when we can make a breaking change.

kdy1 on Jun 23, 2023

Thanks no worries for now i will use version <= 1.3.6 👍

aelbore on Nov 12, 2022

@aelbore Not sure. Fix would be trivial but I don’t want to use my time for this

kdy1 on Nov 12, 2022