Class: Condenser::BabelProcessor

Inherits:
NodeProcessor show all
Defined in:
lib/condenser/processors/babel_processor.rb

Instance Attribute Summary collapse

Attributes inherited from NodeProcessor

#npm_path

Instance Method Summary collapse

Methods inherited from NodeProcessor

#binary, call, #exec_runtime, #exec_runtime_error, #exec_syntax_error, #name, #npm_install, #npm_module_path, setup

Constructor Details

#initialize(dir = nil, **options) ⇒ BabelProcessor

Returns a new instance of BabelProcessor.



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# 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

Instance Attribute Details

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/condenser/processors/babel_processor.rb', line 5

def options
  @options
end

Instance Method Details

#call(environment, input) ⇒ Object 



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# 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);
          },

          ExportDeclaration(path, state) {
            hasExports = true;
            if (path.node.source) {
              imports.push(path.node.source.value);
            }
          },

          ExportDefaultDeclaration(path, state) {
            defaultExport = 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) ⇒ Object

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.



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# File 'lib/condenser/processors/babel_processor.rb', line 150

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