# rollup-plugin-jscc
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Conditional compilation and compile-time variable replacement for [Rollup](http://rollupjs.org/).
rollup-plugin-jscc is **not** a transpiler, it is a wrapper of [jscc](https://github.com/aMarCruz/jscc), a tiny and powerful, language agnostic file preprocessor that uses JavaScript to transform text based on expressions at compile time.
With jscc, you have:
- Conditional inclusion/exclusion of blocks, based on compile-time variables\*
- Compile-time variables with all the power of JavaScript expressions
- Replacement of variables in the sources, by its value _at compile-time_
- Sourcemap support, useful for JavaScript sources.
- TypeScript v3 definitions
\* This feature allows you the conditional declaration of ES6 imports (See the [example](#example)).
Since jscc is a preprocessor, rollup-plugin-jscc is implemented as a _file loader_, so it runs before any transpiler and is invisible to them. This behavior allows you to use it in a wide range of file types but, if necessary, it can be used as a Rollup _transformer_ instead of a loader.
_**NOTE**_
The removal of non-jscc comments is not included, but you can use [rollup-plugin-cleanup](https://github.com/aMarCruz/rollup-plugin-cleanup), which brings compaction and normalization of lines in addition to the conditional removal of JS comments.
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Thanks for your support!
## Install
```bash
npm i rollup-plugin-jscc -D
# or
yarn add rollup-plugin-jscc -D
```
rollup-plugin-jscc requires rollup v2.0 and node.js v10.12 or later.
### Usage
rollup.config.js
```js
import { rollup } from 'rollup'
import jscc from 'rollup-plugin-jscc'
export default {
input: 'src/main.js',
plugins: [
jscc({
values: { _APPNAME: 'My App', _DEBUG: 1 },
}),
],
//...other options
}
```
in your source:
```js
/*#if _DEBUG
import mylib from 'mylib-debug';
//#else */
import mylib from 'mylib'
//#endif
mylib.log('Starting $_APPNAME v$_VERSION...')
```
output:
```js
import mylib from 'mylib-debug'
mylib.log('Starting My App v1.0.0...')
```
That's it.
\* jscc has two predefined memvars: `_FILE` and `_VERSION`, in addition to giving access to the environment variables through the nodejs [`proccess.env`](https://nodejs.org/api/process.html#process_process_env) object.
## Options
Plain JavaScript object, with all properties optional.
| Name | Type | Description |
| --- | --- | --- |
| asloader | boolean | If `false`, run the plugin as a `transformer`, otherwise run as `loader` (the default). |
| escapeQuotes | string | String with the type of quotes to escape in the output of strings: 'single', 'double' or 'both'.
**Default** nothing. |
| keepLines | boolean | Preserves the empty lines of directives and blocks that were removed.
Use this option with `sourceMap:false` if you are interested only in keeping the line numbering.
**Default** `false` |
| mapHires | boolean | Make a hi-res source-map, if `sourceMap:true` (the default).
**Default** `true` |
| prefixes | string | RegExp |
Array<string|RegExp> | The start of a directive. That is the characters before the '#', usually the start of comments.
**Default** `['//', '/*', '