Class: Condenser::BabelProcessor

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

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from NodeProcessor

#binary, #exec_runtime, #exec_runtime_error, #exec_syntax_error, node_modules_path, #node_modules_path, setup

Constructor Details

#initialize(options = {}) ⇒ BabelProcessor

Returns a new instance of BabelProcessor.



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# File 'lib/condenser/processors/babel_processor.rb', line 11

def initialize(options = {})
  @options = {
    ast: false,
    compact: false,
    plugins: [
      ["#{node_modules_path}/babel-plugin-transform-class-extended-hook", {}],
      ["#{node_modules_path}/@babel/plugin-proposal-class-properties", {}],
      ["#{node_modules_path}/@babel/plugin-transform-runtime", {
        corejs: 3,
        useESModules: true
      }],
    ],
    presets: [["#{File.expand_path('../node_modules', __FILE__)}/@babel/preset-env", {
      "modules": false,
      "targets": { "browsers": "> 1% and not dead" }
      # "useBuiltIns": 'usage',
      # corejs: { version: 3, proposals: true }
    } ]],
    sourceMap: false
  }.merge(options)
end

Class Method Details

.call(environment, input) ⇒ Object

npm install @babel/core @babel/runtime-corejs3 @babel/plugin-transform-runtime @babel/preset-env rollup rollup-plugin-commonjs rollup-plugin-node-resolve @babel/plugin-proposal-class-properties babel-plugin-transform-class-extended-hook



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# File 'lib/condenser/processors/babel_processor.rb', line 7

def self.call(environment, input)
  new.call(environment, input)
end

Instance Method Details

#call(environment, input) ⇒ Object 



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# File 'lib/condenser/processors/babel_processor.rb', line 33

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? }
  
  result = exec_runtime(<<-JS)
    const babel = require("#{File.expand_path('../node_modules', __FILE__)}/@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) ⇒ 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 117

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