class Condenser::BabelProcessor

Attributes

options[RW]

Public Class Methods

new(dir = nil, options = {}) click to toggle source
Calls superclass method Condenser::NodeProcessor::new
# File lib/condenser/processors/babel_processor.rb, line 7
def initialize(dir = nil, options = {})
  super(dir)
  
  options[:plugins] ||= [
    ["@babel/plugin-transform-runtime", { corejs: 3, useESModules: true }]
  ]
  options[:presets] ||= [
    ['@babel/preset-env', {
      modules: false,
      targets: { browsers: '> 1% and not dead' }
    }]
  ]

  packages = options.slice(:plugins, :presets).values.reduce(&:+).map { |p| p.is_a?(Array) ? p[0] : p}
  packages.unshift('@babel/core')
  if packages.include?('@babel/plugin-transform-runtime')
    runtime = options[:plugins].find { |i| i.is_a?(Array) ? i[0] == '@babel/plugin-transform-runtime' : i == '@babel/plugin-transform-runtime' }
    packages << if runtime.is_a?(Array) && runtime[1][:corejs]
      if runtime[1][:corejs].is_a?(Hash)
        "@babel/runtime-corejs#{runtime[1][:corejs][:version]}"
      else
        "@babel/runtime-corejs#{runtime[1][:corejs]}"
      end
    else
      '@babel/runtime'
    end
  end
  
  npm_install(*packages)
  
  options[:plugins].map! do |plugin|
    if plugin.is_a?(Array)
      plugin[0] = npm_module_path(plugin[0])
      plugin
    else
      npm_module_path(plugin)
    end
  end
  
  options[:presets].map! do |plugin|
    if plugin.is_a?(Array)
      plugin[0] = npm_module_path(plugin[0])
      plugin
    else
      npm_module_path(plugin)
    end
  end

  @options = {
    ast:        false,
    compact:    false,
    sourceMap:  false
  }.merge(options)
end

Public Instance Methods

call(environment, input) click to toggle source
# File lib/condenser/processors/babel_processor.rb, line 62
  def call(environment, input)
    opts = {
      # 'moduleRoot' => nil,
      'filename' => input[:filename],
      'moduleId' => input[:filename].sub(/(\..+)+/, ''),
      'cwd' => '/assets/',
      'filenameRelative' => input[:filename],
      'sourceFileName' => input[:filename]
      # 'sourceMapTarget' => input[:filename]
      # 'inputSourceMap'
    }.merge(@options).select { |k,v| !v.nil? }
    
    if match = input[:source].match(/\A(\/\/[^\n]*(\n|\z))*/)
      directives = match.to_s.split(/\n/).map { |l| l.delete_prefix("//").strip }
      directives.each do |directive|
        if directive.start_with?('depends_on')
          input[:process_dependencies] << directive.sub(/\Adepends_on\s+/, '')
        end
      end
    end
    
    
    result = exec_runtime(<<-JS)
      const babel = require("#{File.join(npm_module_path('@babel/core'))}");
      const source = #{JSON.generate(input[:source])};
      const options = #{JSON.generate(opts).gsub(/"@?babel[\/-][^"]+"/) { |m| "require(#{m})"}};
      
      let imports = [];
      let defaultExport = false;
      let hasExports = false;
      options['plugins'].push(function({ types: t }) {
        return {
          visitor: {
            ImportDeclaration(path, state) {
              imports.push(path.node.source.value);
            },
            ExportDefaultDeclaration(path, state) {
              hasExports = true;
              defaultExport = true;
            },
            ExportDefaultSpecifier(path, state) {
              hasExports = true;
              defaultExport = true;
            },
            ExportAllDeclaration(path, state) {
              hasExports = true;
            },
            ExportNamedDeclaration(path, state) {
              hasExports = true;
            },
            ExportSpecifier(path, state) {
              hasExports = true;
            },
          }
        };
      });
      
      
      try {
        const result = babel.transform(source, options);
        result.imports = imports;
        result.exports = hasExports;
        result.defaultExport = defaultExport;
        console.log(JSON.stringify(result));
      } catch(e) {
        console.log(JSON.stringify({'error': [e.name, e.message, e.stack]}));
        process.exit(0);
      }
    JS
    
    if result['error']
      if result['error'][0] == 'SyntaxError'
        raise exec_syntax_error(result['error'][1], "/assets/#{input[:filename]}")
      else
        raise exec_runtime_error(result['error'][0] + ': ' + result['error'][1])
      end
    else
      input[:source] = result['code']
      input[:map] = result['map']
      input[:export_dependencies] = result['imports'].map do |i|
        i.end_with?('.js') ? i : "#{i}.js"
      end
      input[:default_export] = result['defaultExport']
      input[:exports] = result['exports']
    end
  end
split_subpath(path, subpath) click to toggle source

Internal: Get relative path for root path and subpath.

path - String path subpath - String subpath of path

Returns relative String path if subpath is a subpath of path, or nil if subpath is outside of path.

# File lib/condenser/processors/babel_processor.rb, line 156
def split_subpath(path, subpath)
  return "" if path == subpath
  path = File.join(path, ''.freeze)
  if subpath.start_with?(path)
    subpath[path.length..-1]
  else
    nil
  end
end