Tom Boucher f954bb4cac refactor(#1679): ADR-1239 Phase B — collapse is<Runtime> flag blocks into runtimeFlags [AC2 slice 3] (#1811) ...

* refactor(#1679): ADR-1239 Phase B — collapse is<Runtime> flag blocks into runtimeFlags [AC2 slice 3]

Phase 2 AC2 slice 3. Collapses the four duplicated 'const isX = runtime === x'
declaration blocks in bin/install.js (uninstall / writeManifest / install / a
fourth helper — 48 of the 101 remaining runtime=== branches) into a single
runtimeFlags(runtime) helper in src/runtime-name-policy.cts, sibling to
getDirName / getRuntimeLabel / getGlobalConfigHomeFragment.

The purest add-a-host tax: a new runtime meant remembering to add ~12 flag lines
to each of four functions. Now it is one entry in RUNTIME_FLAG_IDS.

- src/runtime-name-policy.cts: RUNTIME_FLAG_IDS + runtimeFlags(runtime) -> frozen
  map of is<Runtime> booleans (single runtime=== source, via loop).
- bin/install.js: import runtimeFlags; replace the 4 declaration blocks with one
  destructure each. ZERO usage-site churn (flag names preserved; install.js's
  eslint block has no no-unused-vars rule so destructure-all is clean).
- tests/runtime-flags.test.cjs: 4 tests (each runtime sets exactly its flag,
  claude/unknown/empty -> all false, all 15 flags present + frozen, drift guard).

runtime === count: 101 -> 53 (-48). golden-install-parity 16/16 byte-identical
(behavior-identical collapse). AC2 data-collapse now substantially complete;
ADR-1235 agent-loop tail + per-runtime semantic residue remain (separate).

* chore(changeset): add Changed fragment for runtimeFlags collapse (#1679)

2026-06-28 14:59:29 -04:00

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