Regression in 5.110.0 with `esbuild-loader`: "ERROR: "minify" must be a boolean"

### Have you used AI?

No

### Which part of webpack is affected?

optimization (tree-shaking, splitChunks, concatenation)

### Bug Description

When trying to build JS with the `EsbuildPlugin` from `esbuild-loader`, the following error is displayed:
```
ERROR: "minify" must be a boolean
```

This happens with the following configuration:

```js
const { EsbuildPlugin } = require("esbuild-loader");

module.exports = {
  mode: "production",
  entry: "./index.js",
  optimization: {
    minimizer: [
      new EsbuildPlugin({
        // minify: true, // <-- fix commented out
        target: "es2015",
        css: true,
      }),
    ],
  },
};

```

### Link to Minimal Reproduction and steps to reproduce

```bash
$ mkdir webpack-eslint-loader-bug && cd webpack-eslint-loader-bug
$ npm init -y
$ npm i -D webpack@5.110.0 webpack-cli esbuild esbuild-loader
$ echo 'console.log("Hello");' > index.js
$ cat <<-CONF > webpack.config.js
const { EsbuildPlugin } = require("esbuild-loader");

module.exports = {
  mode: "production",
  entry: "./index.js",
  optimization: {
    minimizer: [
      new EsbuildPlugin({
        // minify: true,
        target: "es2015",
        css: true,
      }),
    ],
  },
};
CONF
$ sed -i -E 's/("scripts": \{)/\1\n    "build": "webpack",/' package.json
$ npm run build
```

### Expected Behavior

The build to work correctly.

### Actual Behavior

Error: `ERROR: "minify" must be a boolean`

### Environment

```shell
System:
 - OS: (irrelevant)
 - CPU: (irrelevant)
 - Memory: (irrelevant)
Binaries:
 - Node: 24.18.1 - /usr/local/bin/node
 - Yarn: 1.22.19 - /usr/local/bin/yarn
 - npm: 11.16.0 - /usr/local/bin/npm
Browsers:
 - Chrome: (irrelevant)
 - Firefox: (irrelevant)
 - Firefox Developer Edition: (irrelevant)
Packages:
 - esbuild-loader: ^4.5.0 => 4.5.0 
 - webpack: ^5.110.0 => 5.110.0 
 - webpack-cli: ^7.2.3 => 7.2.3
```

### Is this a regression?

Yes (please specify version below)

### Last Working Version

v5.109.2

(broken in v5.110.0)

### Additional Context

If you uncomment the `minify: true,` configuration in the sample configuration it works.

It also works with webpack v5.109.2.

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Uh oh!

Regression in 5.110.0 with `esbuild-loader`: "ERROR: "minify" must be a boolean" #21879

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Uh oh!

Regression in 5.110.0 with esbuild-loader: "ERROR: "minify" must be a boolean" #21879

Description

Have you used AI?

Which part of webpack is affected?

Bug Description

Link to Minimal Reproduction and steps to reproduce

Expected Behavior

Actual Behavior

Environment

Is this a regression?

Last Working Version

Additional Context

Activity

Metadata

Metadata

Assignees

Labels

Type

Fields

Projects

Milestone

Relationships

Development

Issue actions

Regression in 5.110.0 with `esbuild-loader`: "ERROR: "minify" must be a boolean" #21879