TypeScript transformer to rename imports (like babel-plugin-import-rename)

transformer.js

const ts = require('typescript');

const IMPORT_RE = /(.*)\.pcss$/;
const REPLACE_TO = '$1.css';

module.exports = function () {
  return function (context) {
    function visitor(node) {
      const isImport = ts.isImportDeclaration(node);
      const moduleName = isImport && node.moduleSpecifier ? node.moduleSpecifier.text : null;
      const match = moduleName && IMPORT_RE.test(moduleName);

      IMPORT_RE.lastIndex = 0;

      if (!match) {
        return ts.visitNodes(node, visitor, context);
      }

      return ts.createImportDeclaration(
        undefined,
        undefined,
        undefined,
        ts.createLiteral(moduleName.replace(IMPORT_RE, REPLACE_TO)),
      );
    }

    return function transform(sourceFile) {
      return ts.visitEachChild(sourceFile, visitor, context)
    }
  }
}