code: function add({
    id, path, types: t, key, value,
  }) {
    const programPath = path.findParent(p => p.isProgram());
    const keyMapNode = getKeyMapNode({ id, programPath, types: t });
  
    keyMapNode.properties.push(t.objectProperty(
      t.identifier(key), t.stringLiteral(value),
    ));
  }
docs: /*
  * id: identifier of the keymap
  * path: path of the current node
  * types: @babel/types
  * key: key of entry
  * value: value of entry