banner

• Type: optional banner: string | (chunk) => string | Promise<string>

Defined in: options/output-options.ts:226

A string to prepend to the bundle before renderChunk hook.

See output.intro, output.postBanner as well.

WARNING

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

• Use output.postBanner instead, which are added after minification, or
• Use one of these comment formats:
  • Comments starting with /*! (e.g., /*! My banner */)
  • Comments containing @license (e.g., /* @license My banner */)
  • Comments containing @preserve (e.g., /* @preserve My banner */)
  • 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.