Output Footer

:::warning

When using output.footer with minification enabled, the footer content may be stripped out unless it is formatted as a legal comment. To ensure your footer persists through minification, do either:

• Use output.postFooter instead, which is added after minification, or
• Use one of these comment formats:
  • Comments starting with /*! (e.g., /*! My footer */)
  • Comments containing @license (e.g., /* @license My footer */)
  • Comments containing @preserve (e.g., /* @preserve My footer */)
  • Comments starting with //! (for single-line comments)

The latter way's behavior is controlled by the output.legalComments option, which defaults to 'inline' and preserves these special comment formats.

:::

Examples

Expose the default export as module.exports for CJS output with all named exports as properties

export default {
  output: {
    format: 'cjs',
    exports: 'named',
    footer: (chunk) => {
      if (chunk.isEntry) {
        return `
module.exports = exports.default;
module.exports.default = module.exports;
module.exports.foo = module.exports.default.foo;`;
      }
      return '';
    },
  },
};