rollup-plugin-require-context2/src/helper/resolve-require-code.js

rollup-plugin for webpack requrie-context

const Path = require('path');

let uid = 0;

function getUID() {
  return uid++;
}


function genImportCode(name, path) {
  return `import ${name} from '${path}';\n`;
}

function genPropsCode(key, value) {
  return `'${key}': ${value},\n`;
}

module.exports = function genRequireCode(baseDirname, modules) {
  const uid = getUID();
  let importCode = '';
  let moduleProps = '';

  modules.forEach((file, index) => {
    const moduleName = `require_context_module_${uid}_${index}`;

    const moduleAbsolutePath = Path.resolve(baseDirname, file).replace(/\\/g, '/');
    // fix for windows, if the key contains \ in path
    // Object.keys method will sadly drop the \.
    const filePath = file.replace(/\\/g, '/');
    importCode += genImportCode(moduleName, moduleAbsolutePath);
    moduleProps += genPropsCode(filePath, moduleName);
  });
  const requireFnCode = (`
  (function() {
    var map = {
      ${moduleProps}
    };
    var req = function req(key) {
      return map[key] || (function() { throw new Error("Cannot find module '" + key + "'.") }());
    }
    req.keys = function() {
      return Object.keys(map);
    }
    return req;
  })()
`);

  return {
    importCode,
    requireFnCode
  };
}