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v2.11.0

What's Changed in 2.11.0

• feat: Adds a new getTimeline() method for getting the series of minimum browser changes, either grouped by date or by browser.
• refactor: Substantial refactoring of the data compression process that replaces the full list of browsers from @mdn/browser-compat-data and downstream-browsers.json and features from web-features (in their very pared down form) with a change-list timeline that reflects which versions supported Baseline (newly available) on a given date. Thanks to @​swwind for the idea!
• refactor: Some common functions have been moved to a util.ts module for use in other scripts.
• fix: Removes process.exit() calls when unsupported option combinations are passed to getCompatibleVersions() and getAllVersions() in favour of throwing an Error. There is a small security risk with process.exit() calls that sites accepting unsanitised inputs could be the subject of attacks. Unsupported config options now throw and Error which should allow for more graceful handling. Thanks to @​bnbdr for flagging this as vulnerability CVE-2026-45819 .

Fixes #134

Full Changelog: web-platform-dx/baseline-browser-mapping@v2.10.44...v2.11.0

v2.10.0

What's Changed

• Introduces support for Node 6 by refactoring all Object.entries and Object.values instances and lowering ES target in Rollup to es2015.
• Adds specified Node version support in package.json for >=6.0.0.
• Refactors CLI code to avoid parseArgs which is not supported by versions of Node prior to 18, changes import to require and changes Rollup export to cjs to allow execution on older versions of Node.
• Adds a new legacy-test.js file that allows basic testing on older versions of Node where current versions of Jasmine and ESLint are not supported.
• Adds a test matrix to run tests on all even-numbered Node versions from 6 to 24.
• refactor publish workflows to support NPM's new OIDC integration

Full Changelog: web-platform-dx/baseline-browser-mapping@v2.9.24...v2.10.0

v2.9.3 - remove process.loadEnvFile()

What's Changed

• Remove process.loadEnfFile() from main script by @​tonypconway in web-platform-dx/baseline-browser-mapping#112

Full Changelog: web-platform-dx/baseline-browser-mapping@v2.9.2...v2.9.3

v2.9.2 - fix browser support bug

What's Changed

• Fix browser support bug by @​tonypconway in web-platform-dx/baseline-browser-mapping#111 Full Changelog: web-platform-dx/baseline-browser-mapping@v2.9.1...v2.9.2

v2.9.0 - Reduce frequency of data staleness warnings

This version introduces a number of changes to data staleness warnings in response to #105 , #107 and #109

• Data staleness warnings are now only shown if the getCompatibleVersions() or getAllVersions() functions are called - previously they were shown whenever the module was loaded, which meant many browserslist consumers were seeing the warning despite not targeting Baseline, especially those who were consuming browserslist in a pre-compiled format via next.js.
• Adds new conditions for these warnings to be displayed which should only warn users for whom data freshness is critical:
  • The feature cut off data must be within the last two months, i.e. widelyAvailableOnDate: today + >2 years and 4 months or newly available in a browserslist query.
  • The module data must be more than 2 months old.
• Introduces suppression options for these warning via the options objects and environment variables:
  • Adds a new suppressWarnings boolean to the getCompatibleVersions() and getAllVersions()
  • Respects the existing BROWSERSLIST_IGNORE_OLD_DATA environment variable.
  • Respects a new BASELINE_BROWSER_MAPPING_IGNORE_OLD_DATA environment variable.
• Adds explanatory text to the README for how to avoid such warnings when reproducible builds are a requirement.
• Change warning text to be package manager agnostic and mention the possibility of pre-compiled data.

• 0e5ed80 Patch to 2.11.21 because browser or feature data changed
• 11da0b6 Browser or feature data changed
• 69fcc81 Updating static site
• b964de0 Patch to 2.11.20 because browser or feature data changed
• 723099f Browser or feature data changed
• f44163d Updating static site
• 8966043 Patch to 2.11.19 because browser or feature data changed
• e18601d Browser or feature data changed
• 28cb50a Updating static site
• cb33a83 Patch to 2.11.18 because browser or feature data changed
• Additional commits viewable in compare view

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