minify.mangle causes variable confusion

[noyobo]

Describe the bug

In the case , output code :

// ....other code
export const styleLoader = ()=>{
    return {
        name: 'style-loader',
        setup (n) {
            n.onLoad({
                filter: /.*/,
                namespace: 'less'
            }, function() {
                var n = t(function*(n) {});
                return function(n) {
                    // n is args variable
                    return n.apply(this, arguments); 
                    // when run the code get an error `n.apply is not a function`
                };
            }());
        }
    };
};

before mangle output code is :

// ....other code
export const styleLoader = ()=>{
    return {
        name: 'style-loader',
        setup (build) {
            build.onLoad({
                filter: /.*/,
                namespace: 'less'
            }, function() {
                var _ref = _asyncToGenerator(function*(args) {});
                return function(args) {
                    // _ref variable is async 
                    return _ref.apply(this, arguments);
                };
            }());
        }
    };
};

Input code

import { OnResolveArgs, PartialMessage, Plugin, PluginBuild } from 'esbuild';
import fs from 'fs';
import path from 'path';

export const styleLoader = (): Plugin => {
  return {
    name: 'style-loader',
    setup(build: PluginBuild) {
      build.onLoad({ filter: /.*/, namespace: 'less' }, async (args) => {
        
      });
    },
  };
};

Config

{
  "jsc": {
    "parser": {
      "syntax": "typescript",
      "tsx": false
    },
    "target": "es2015",
    "loose": false,
    "minify": {
      "compress": false,
      "mangle": {
        "toplevel": false,
        "keep_classnames": false,
        "keep_fnames": false,
        "keep_private_props": false,
        "ie8": false,
        "safari10": false
      }
    }
  },
  "module": {
    "type": "es6"
  },
  "minify": false,
  "isModule": true
}

Playground link

https://play.swc.rs/?version=1.3.24&code=H4sIAAAAAAAAA01QQW7DIBC8%2BxVzw67c5G4rlZpzq1b9AXHWLhIGi8VVI4u%2FBwhRgpCY3WFmB9S8WOex4cv8EFv9R%2B9u4hbf0nkl9Scxy4lirddJmft5XJU%2BI2B0doYgPqVa9JW6uY1cmJEfzUX639JOMBIV%2FWdmsIY92F80fVh5JocD6qYrs3B4w1YBjvzqTIaAkTN1EFnzqrNItJnheG2pc6DuOW1TlEDmdtakWfWGUWlPrsN%2B97JvszEvckjuOj5eILSQfDEDahl%2FprnHua0CQtNnFFKG0FdxXwGJ3Ag3WQEAAA%3D%3D&config=H4sIAAAAAAAAA22P3QrCMAyF3yXXu9gERfYOPoOEmo5q14YmG47Rd7eT%2FSB4leR8h3DODE8x0M7AmITSsskUFN%2FQgk5MYpJjhQpUimTRC%2BVyYOpIi4XkVDfngn2MQquhgt4FZ6flmYk9JxI5EIbO04I0sqeR%2FI5eRHw3HkUC9iS%2Fuv2jcXIjKpUZ%2BUCOrvsuaDG5pt6i5xK%2Bj49hTVAKfktcIB%2BhtzdyW42aBsofcZ6zHCkBAAA%3D

Expected behavior

The mangle results are the same as terser

Actual behavior

variable confusion

Version

1.3.24

Additional context

No response

[kdy1]

I investigated this, and found that externalHelpers is the cause.

https://play.swc.rs/?version=1.3.24&code=H4sIAAAAAAAAA01QQW7DIBC8%2BxVzw67c5G4rlZpzq1b9AXHWLhIGi8VVI4u%2FBwhRgpCY3WFmB9S8WOex4cv8EFv9R%2B9u4hbf0nkl9Scxy4lirddJmft5XJU%2BI2B0doYgPqVa9JW6uY1cmJEfzUX639JOMBIV%2FWdmsIY92F80fVh5JocD6qYrs3B4w1YBjvzqTIaAkTN1EFnzqrNItJnheG2pc6DuOW1TlEDmdtakWfWGUWlPrsN%2B97JvszEvckjuOj5eILSQfDEDahl%2FprnHua0CQtNnFFKG0FdxXwGJ3Ag3WQEAAA%3D%3D&config=H4sIAAAAAAAAA22PQQrCQAxF75J1Fyoo0hO48QwS6q%2BMTmdCEqVFenenUi2Cq4T%2F85O8J12tofpJwmrQqbMhOfdUkw8CazSIU0VuRWo5GsaK0Ds0cTwgCtSodr2jzLBe4CUJ26zW25KKORvmXEVdSKEdphtN7kRhtlicLhGT5VkiHohf6wbIqYlslriD%2FertH000PNhRapbFCth%2Fe%2BOWNaxXH6KxMHX5fJ8%2FKNxviB2Ny9OfNXacByfm8QVyauLJQAEAAA%3D%3D

[swc-bot]

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