Replace webpack aliases with relative paths

replace-webpack-alias-with-relative-path.js

// Usage: jscodeshift -t replace-webpack-alias-with-relative-path.js ./kibana/x-pack/plugins ./kibana/src

const path = require('path');
const URI = require('urijs');

function getRelativePath(currentFilePath, dependencyPath) {
  return URI(dependencyPath)
    .relativeTo(currentFilePath)
    .toString();
}

// necessary due to: https://github.com/facebook/jscodeshift/issues/44
function retainFirstComment(transformer) {
  return (file, api) => {
    const j = api.jscodeshift;
    const root = j(file.source);

    const getFirstNode = root => root.find(j.Program).get('body', 0).node;
    const firstNode = getFirstNode(root);
    const { comments } = firstNode;

    const newRoot = transformer(file, api);

    const firstNode2 = getFirstNode(newRoot);
    if (firstNode2 !== firstNode) {
      firstNode2.comments = comments;
    }

    return newRoot.toSource({quote: 'single'});
  };
}

const transformer = retainFirstComment((file, api) => {
  const j = api.jscodeshift;
  const absolutePathToDep = '/Users/sqren/elastic/kibana/src/ui/public/chrome';
  const absolutePathToCurrentFile = path.resolve(process.cwd(), file.path);

  const root = j(file.source);
  const importDeclarations = root.find(j.ImportDeclaration).find(j.Literal);

  root
    .find(j.ImportDeclaration)
    .filter(path => path.value.source.value === 'ui/chrome')
    .forEach(path => {
      const relativePath = getRelativePath(
        absolutePathToCurrentFile,
        absolutePathToDep
      );
      return j(path).replaceWith(
        j.importDeclaration(path.node.specifiers, j.literal(relativePath))
      );
    });

  return root;
});

export default transformer;