12.1.0 (2026-06-29) Features experimentation events surface (trackEvent, trackExposureEvent, getExperimentFlag) (#400) (f23db8f) Other deps-dev: bump @babel/plugin-transform-modules-systemjs from 7.23.9 to 7.29.4 (#398) (4d51a7b) deps-dev: bump rollup from 2.79.2 to 2.80.0 (#374) (66a47a5) deps-dev: bump tmp from 0.2.5 to 0.2.7 (#399) (1a0e1f5) deps-dev: replace rollup-plugin-terser with @rollup/plugin-terser (#405) (9e24f08)