babel-helper-transform-fixture-test-runner

Internal Babel helper that provides a test runner for fixture-based tests within Babel's own monorepo. It is used in conjunction with babel-helper-fixtures to run transformation tests on a set of input/output fixtures. Current stable version is 6.26.2 (an older Babel 6 era package). Release cadence is tied to Babel releases. This package is not intended for direct use by consumers; it's an internal dependency for Babel development. Key differentiator: it is specific to Babel's test infrastructure and not a general-purpose testing utility.