webpack-preprocessor-loader

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webpack-preprocessor-loader

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Webpack preprocessor loader

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# Webpack preprocessor loader

Helps to disable parts of the code depending on preprocessor directives.

Use `//#` to start a directive

Supported directives:
```
  ifdef  - If defined, start a new block
  ifndef - If not defined, start a new block
  else   - If the directive was false, use the else block
  endif  - Ends a block
  define - Defines a define variable
  undef  - Undefines a define variable
```

To use define variable substitution use:
  `DEFINED_VARIABLE_NAME`

I hope you will find this useful. If you have problems, please open an issue and I will try to help you as best I can.

## Usage instructions
### Install:
`npm install --save-dev https://github.com/Ramzeus/webpack-preprocessor-loader.git`

### Add to webpack config:
Add it by using `loader: require.resolve('webpack-preprocessor-loader'),`

You can configure the predefined defines by using options like this:
```
options: {
  defines: {
    MY_DEFINE: 'Some Value',
    DEBUG: ''
  }
}
```

### Configuration example:
```
module: {
    rules: [
      {
        test: /\.(ts|js)x?$/,
        loaders: [
          // In this example I use a typescript loader
          // The loaders are run in reverse order,
          // so first the code will filter thru webpack-preprocessor-loader
          // and the thru the typescript loader, or whatever you want to use
          {
            loader: 'awesome-typescript-loader',
            options:{
              configFileName: 'tsconfig.json'
            }
          },
          {
            loader: require.resolve('webpack-preprocessor-loader'),
            options: {
              defines: {
                MY_DEFINE: 'Some value',
                DEBUG: ''
              }
            }
          }
        ],
        exclude: [/node_modules/],
      }
    ]
  },
}
```

## Code example
```
//#ifdef PLATFORM_A
import { stuff } from './platform-specific-code/platform_a'
//#else
import { other_stuff } from './platform-specific-code/platform_b'
//#endif
```
```
  //#ifdef __EXEC_ENV_BROWSER
  const { PlatformHandlerBrowser } = await import("./browser/platform-handler-browser");
  return new PlatformHandlerBrowser();
  //#endif
  //#ifdef __EXEC_ENV_NODE
  const { PlatformHandlerNode } = await import('./node/platform-handler-node');
  return new PlatformHandlerNode();
  //#endif
  //#ifdef __EXEC_ENV_QT
  const { PlatformHandlerQt } = await import("./qt/platform-handler-qt");
  return new PlatformHandlerQt();
  //#endif
  ```

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