Copies of the test262 harness files that tests in $MODDABLE/tests name in their includes: front matter. They are used by the xsdb test runner when no test262 repository is configured (set test262 <path>). When a test262 repository is configured, its harness directory is used instead, so these copies are a fallback only.
assert.js, sta.js, and compareArray.js are not here because the test apps build them in (see ../harness.js); the runner never sends them.
Copied from test262 commit 45e740928f (2024-02-16). These files are governed by the test262 license found in that repository.
To refresh, copy the files from the harness directory of a current test262 checkout.