act-in-page.ts had grown to 1,054 lines: one function holding twenty-eight
closures, of which roughly four hundred lines were pure string and geometry
work that never touched the holder, the action, or any page state. None of it
could be tested. `slug`, `affinity`, `coin` and the rest were reachable only by
running a whole action against a whole document and inferring what they must
have done.
Four modules now, at the seams the dependency graph actually has:
types.ts the six shared interfaces, re-exported from act-in-page.ts so
no import site anywhere changes
naming.ts what an element is called — labels, slugs, stems, anchors
visibility.ts whether it is really there and whether it is on screen
identity.ts the re-bind ladder and handle minting
Each is a factory rather than a bag of exports, and that shape is load-bearing
rather than taste. These sources are stringified into the guest page, where
module scope does not exist; separate exports would be separate names for the
bundler to mangle independently of the call sites inside the stringified core.
A factory that stringifies whole has no cross-module reference to break. The
core takes the kits as a parameter for the same reason — it names nothing it
did not receive.
That failure mode deserves spelling out, because it is why this is not a plain
import. The renderer minifies. An imported binding referenced inside the core
would be renamed to something the injected bundle never declares, and it would
break in packaged builds ONLY — green in dev, green under vitest, broken for
users. `actEngineSource()` is now the single supported way to obtain the
source, so a partial injection is not something a caller can express.
The self-containment test moves with it, and gets stronger: it evaluates the
assembled bundle rather than one function, which is what the guest actually
receives. It caught the contract change on the first run.
Bodies moved unchanged; the only edits are closure captures becoming
parameters, and `coin` taking the counter it used to read off the holder. The
engine is 634 lines, all of it orchestration. The 53 existing engine tests pass
untouched, which is the evidence the move preserved behaviour, and 27 new tests
exercise the extracted helpers directly for the first time.
Brooklyn Nicholson
df06be0a16