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Rslib
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      • lib.format

      • Type: 'esm' | 'cjs' | 'umd' | 'mf' | 'iife'
      • Default: 'esm'
      • CLI: --format <format> (e.g. --format umd)

      Specify the output format for the generated JavaScript output files.

      For different output formats, Rslib uses the following default value of output.library.type provided by Rspack:

      Info

      You can enable Rspack experimental ESM output by setting lib.experiments.advancedEsm to emit ESM output that is high-quality, more friendly to static analysis, and supports code splitting.

      See Output Format and Module Federation for more details.

      Note

      The umd, mf and iife formats only work when bundle is set to true.