addNamedReactImport(specifier) {
    const info = ReactImports.get(this);
    ReactImports.set(this, Object.assign({}, info, {
      namedReactImports: (info.namedReactImports || []).concat(specifier),
    }));
  }
Add a named React import specifier to the scope

@param {ASTNode} specifier The AST Node of a named React import
@returns {void}