[1.0.0-beta.55] - 2025-12-17

✨ Post-Minification Banner & Footer

• New postBanner and postFooter options allow adding content to chunks after minification, ensuring your comments won't be stripped by the minifier:

export default {
  output: {
    minify: true,
    postBanner: '/* My Library v1.0.0 */', // Always preserved
  },
};

🚀 Features

• add validation errors for incompatible inlineDynamicImports options (feat: add validation errors for incompatible inlineDynamicImports options #7539) by @copilot
• rolldown_plugin_vite_reporter: truncate long importer lists in ineffective dynamic import warnings (feat(rolldown_plugin_vite_reporter): truncate long importer lists in ineffective dynamic import warnings #7528) by @copilot
• export memfs from rolldown/experimental for browser builds (feat: export memfs from rolldown/experimental for browser builds #7490) by @copilot
• implement postBanner and postFooter (feat: implement postBanner and postFooter #7487) by @sevenc-nanashi
• port getLogFilter helper from Rollup for advanced log filtering (feat: port getLogFilter helper from Rollup for advanced log filtering #6890) by @taearls
• dev: initialize rolldown_plugin_lazy_compilation (feat(dev): initialize rolldown_plugin_lazy_compilation #7488) by @hyf0
• enable experimental.transform_hires_sourcemap: 'boundary' by default (feat: enable experimental.transform_hires_sourcemap: 'boundary' by default #7478) by @sapphi-red
• apply merge CJS namespace optimizations more generally (feat: apply merge CJS namespace optimizations more generally #7475) by @sapphi-red

🐛 Bug Fixes

• avoid panic on invalid values for output.exports, output.format, output.hash_characters (fix: avoid panic on invalid values for output.exports, output.format, output.hash_characters #7542) by @sapphi-red
• handle __proto__ export for module namespace correctly (fix: handle __proto__ export for module namespace correctly #7534) by @sapphi-red
• handle __proto__ export correctly (fix: handle __proto__ export correctly #7533) by @sapphi-red
• rolldown_plugin_vite_resolve: acquire resolver lock before package json resolution (fix(rolldown_plugin_vite_resolve): acquire resolver lock before package json resolution #7524) by @sapphi-red
• disable syntax transform optimization for minify: 'dce-only' (fix: disable syntax transform optimization for minify: 'dce-only' #7520) by @sapphi-red
• arrow function expression keep names (fix: arrow function expression keep names #7519) by @IWANABETHATGUY
• skip symbols that are imported from other module when deconflicting module symbols (fix: skip symbols that are imported from other module when deconflicting module symbols #7510) by @IWANABETHATGUY
• preserve class names in assignment expressions with keepNames option (fix: preserve class names in assignment expressions with keepNames option #7491) by @IWANABETHATGUY
• accessor with decorators should be kept (fix: accessor with decorators should be kept #7499) by @copilot
• rolldown_plugin_vite_reporter: support Infinity for chunk_limit (fix(rolldown_plugin_vite_reporter): support Infinity for chunk_limit #7497) by @shulaoda
• change filename template validation errors from UNHANDLEABLE_ERROR to INVALID_OPTION (fix: change filename template validation errors from UNHANDLEABLE_ERROR to INVALID_OPTION #7472) by @copilot
• no entry found for key error when merging CJS namespace exports (fix: no entry found for key error when merging CJS namespace exports #7474) by @sapphi-red
• generate output with syntax error when wrapped esm module using tla syntax (fix: generate output with syntax error when wrapped esm module using tla syntax #7468) by @IWANABETHATGUY

🚜 Refactor

• dev: rename experimental.hmr to experimental.devMode (refactor(dev): rename experimental.hmr to experimental.devMode #7527) by @hyf0
• pass addon option to rust as it is (refactor: pass addon option to rust as it is #7526) by @hyf0
• remove unused stmtinfo meta flag (refactor: remove unused stmtinfo meta flag #7518) by @IWANABETHATGUY

📚 Documentation

• clarify closeBundle behavior (docs: clarify closeBundle behavior #7525) by @sapphi-red

🧪 Testing

• add tests for static string postBanner and postFooter (test: add tests for static string postBanner and postFooter #7516) by @copilot
• disable pluginTimings in Rust integration tests to avoid snapshot noise (test: disable pluginTimings in Rust integration tests to avoid snapshot noise #7485) by @shulaoda
• port Rollup JSX tests to crates/rolldown/tests/rollup (test: port Rollup JSX tests to crates/rolldown/tests/rollup #7480) by @sapphi-red
• re-triage some esbuild JSX preserve tests (test: re-triage some esbuild JSX preserve tests #7479) by @sapphi-red
• disable pluginTimings by default to avoid snapshot noise (test: disable pluginTimings by default to avoid snapshot noise #7471) by @shulaoda

⚙️ Miscellaneous Tasks

• mark feature that will not be supported as ignored in rollup test status (chore: mark feature that will not be supported as ignored in rollup test status #7535) by @sapphi-red
• support banner/footer/intro/outro for config variants (chore: support banner/footer/intro/outro for config variants #7532) by @sapphi-red
• dce/dce_of_decorators esbuild test is now passing (chore: dce/dce_of_decorators esbuild test is now passing #7531) by @sapphi-red
• deps: update github-actions (major) (chore(deps): update github-actions (major) #7495) by @renovate[bot]
• deps: update npm packages (chore(deps): update npm packages #7493) by @renovate[bot]
• add a check to verify failedReasons are updated (chore: add a check to verify failedReasons are updated #7521) by @sapphi-red
• deps: update test262 submodule for tests (chore(deps): update test262 submodule for tests #7523) by @sapphi-red
• deps: update taiki-e/install-action action to v2.63.2 (chore(deps): update taiki-e/install-action action to v2.63.2 #7496) by @renovate[bot]
• deps: update oxc apps (chore(deps): update oxc apps #7511) by @renovate[bot]
• deps: update oxc to v0.103.0 (chore(deps): update oxc to v0.103.0 #7513) by @camc314
• fix format in .github/instructions/bug-investigation.instructions.md (chore: fix format in .github/instructions/bug-investigation.instructions.md #7506) by @sapphi-red
• add instructions for REPL decoding (chore: add instructions for REPL decoding #7502) by @sapphi-red
• deps: update github-actions (chore(deps): update github-actions #7492) by @renovate[bot]
• deps: cargo-shear v1.9.0 (chore(deps): cargo-shear v1.9.0 #7483) by @Boshen
• deps: update dependency oxlint-tsgolint to v0.9.0 (chore(deps): update dependency oxlint-tsgolint to v0.9.0 #7484) by @renovate[bot]
• deps: update dependency oxlint-tsgolint to v0.8.6 (chore(deps): update dependency oxlint-tsgolint to v0.8.6 #7470) by @renovate[bot]
• add syntax validation for test output chunks that are not executed (chore: add syntax validation for test output chunks that are not executed #7466) by @IWANABETHATGUY
• deps: update dependency rust to v1.92.0 (chore(deps): update dependency rust to v1.92.0 #7467) by @renovate[bot]
• deps: update test262 submodule for tests (chore(deps): update test262 submodule for tests #7457) by @sapphi-red

❤️ New Contributors

• @sevenc-nanashi made their first contribution in #7487
• @taearls made their first contribution in #6890