message: build: simplify webpack aliasing by embedding __dirname
diff: @@ -138,9 +138,10 @@ function createImportTargets(importTargets, targetName, targetDirectory) {
  "use strict"
  var path = require('path');
  +var dir = path.resolve(__dirname);
  -module.exports = function(PATH_REPLACEMENT) {
  - return ${JSON.stringify(importMap, null, 4).replace(/(: )(".+")(,?)/g, "$1path.resolve(PATH_REPLACEMENT, $2)$3")};
  +module.exports = function() {
  + return ${JSON.stringify(importMap, null, 4).replace(/(: )"rxjs\/_esm(5|2015)\/(.+")(,?)/g, "$1path.join(dir, \"$3)$4")};
  }
  `
  