From node you can just require @chia/chialisp like this
const {h, t, Program} = require('@chia/chialisp');
This repo has a test rig set up. You can run it like this:
$ yarn install
...
$ yarn test
yarn run v1.22.19
$ jest
PASS src/lib/tests/index.test.ts
✓ Has BLS signatures support (786 ms)
✓ Has the "h" function (1 ms)
✓ Converts to string (2 ms)
✓ Accepts already converted objects (3 ms)
✓ Has as_pair (3 ms)
✓ Has null (1 ms)
✓ Has listp (2 ms)
✓ Has nullp (2 ms)
✓ Has as_int (1 ms)
✓ Has as_bigint (2 ms)
✓ Has first and rest (3 ms)
✓ Has cons (3 ms)
✓ Has the t function (4 ms)
✓ Has as_bin (2 ms)
✓ Has list_len (3 ms)
✓ Has equal_to (4 ms)
✓ Has as_javascript (6 ms)
✓ Has run (2 ms)
✓ Has curry (11 ms)
✓ works as expected in context (72 ms)
Test Suites: 1 passed, 1 total
Tests: 20 passed, 20 total
Snapshots: 0 total
Time: 2.726 s
Ran all test suites.
Done in 3.75s.