# babel-plugin-transform-es2015-block-scoped-functions > Babel plugin to ensure function declarations at the block level are block scoped. ## Installation ```sh npm install --save-dev babel-plugin-transform-es2015-block-scoped-functions ``` ## Usage ### Via `.babelrc` (Recommended) **.babelrc** ```json { "plugins": ["transform-es2015-block-scoped-functions"] } ``` ### Via CLI ```sh babel --plugins transform-es2015-block-scoped-functions script.js ``` ### Via Node API ```javascript require("babel-core").transform("code", { plugins: ["transform-es2015-block-scoped-functions"] }); ```