This compiler will not work with older Riot.js versions. It's designed to work with Riot.js > 4.0.0. For Riot.js < 4.0.0 please check the v3 branch

npm i @riotjs/compiler -D

The riot compiler can compile only strings:

import { compile } from '@riotjs/compiler'
const { code, map } = compile('<p>{hello}</p>')

You can compile your tags also using the new registerPreprocessor and registerPostprocessor APIs for example:

import {
  compiler,
  registerPreprocessor,
  registerPostprocessor,
} from '@riotjs/compiler'
import pug from 'pug'
import * as babel from '@babel/core'
// process your tag template before it will be compiled
registerPreprocessor('template', 'pug', function (code, { options }) {
  const { file } = options
  console.log('your file path is:', file)
  return {
    code: pug.render(code),
    // no sourcemap here
    map: null,
  }
})
// your compiler output will pass from here
registerPostprocessor(function (code, { options }) {
  const { file } = options
  console.log('your file path is:', file)
  // notice that babel.transformSync returns {code, map}
  return babel.transformSync(code)
})
const { code, map } = compile('<p>{hello}</p>', {
  // specify the template preprocessor
  template: 'pug',
})

• string: is your tag source code
• options: the options should contain the file key identifying the source of the string to compile and the template preprocessor to use as string

Note: specific preprocessors like the css or the javascript ones can be enabled simply specifying the type attribute in the tag source code for example

<my-tag>
  <style type="scss">
    // ...
  </style>
</my-tag>

• type: either one of template css or javascript
• id: unique preprocessor identifier
• preprocessorFn: function receiving the code as first argument and the current options as second

• postprocessorFn: function receiving the compiler output as first argument and the current options as second