chore: script/bootstrap fails when node cannot find a module the tests load (closes #263)

yarn install exits 0 without touching node_modules whenever
node_modules/.yarn-integrity matches yarn.lock, so a package deleted from
node_modules stayed deleted while bootstrap printed "bootstrap complete".
After the install, bootstrap now asks node to resolve jest,
playwright-core and ethers, and on the first it cannot find it names the
module and the fix: rm -rf node_modules && make bootstrap.

Model: opus-5-5

README.md

@@ -219,8 +219,7 @@ provide:
 
 - `script/bootstrap` — install all dependencies (pinned node via nvm if needed,
   yarn via corepack, `yarn install --frozen-lockfile`), then fail, naming the
-  package, if node cannot find a package listed in `dependencies` or
-  `devDependencies` of `package.json`
+  module, if node cannot find `jest`, `playwright-core` or `ethers`
 - `script/setup` — make a fresh clone ready for development: bootstrap plus the
   git pre-commit hook
 - `script/projectname` — print the project name (used for the Docker image tag)

TODO.md

@@ -46,10 +46,10 @@ but the review is broader than any of them.
 # Completed Steps
 
 - 2026-10-06: `script/bootstrap` no longer reports success while node cannot
-  find a package listed in `dependencies` or `devDependencies` of `package.json`
+  find a module the tests load
   ([#263](https://git.eeqj.de/sneak/AutistMask/issues/263)). After the install
-  it asks node for each one's `package.json`, and fails naming the missing
-  package and the fix. yarn skips the install whenever
+  it asks node for `jest`, `playwright-core` and `ethers`, and fails naming the
+  missing one and the fix. yarn skips the install whenever
   `node_modules/.yarn-integrity` matches `yarn.lock`, so a package deleted from
   `node_modules` stayed deleted while bootstrap said it was complete. The
   fresh-clone failure the issue reports did not reproduce.

script/bootstrap

@@ -127,38 +127,28 @@ install_js_deps() {
     fi
 }
 
-# run_node: run node from the repo root, through nvm when node is not on PATH;
-# the script comes on stdin
-run_node() {
+# resolvable <module>: true when node, run from the repo root, finds it
+resolvable() {
     if missing node && [ -s "$HOME/.nvm/nvm.sh" ]; then
-        nvm_sh "nvm use $NODE_VERSION >/dev/null && cd \"$ROOT\" && node"
+        nvm_sh "nvm use $NODE_VERSION >/dev/null && cd \"$ROOT\" && \
+            node -e \"require.resolve('$1')\"" 2>/dev/null
     else
-        node
+        node -e "require.resolve('$1')" 2>/dev/null
     fi
 }
 
 # yarn install exits 0 without touching node_modules once
 # node_modules/.yarn-integrity matches yarn.lock, so a package deleted from
-# node_modules stays deleted. Fail unless node finds every package listed in
-# dependencies and devDependencies of package.json, by its package.json. When a
-# package's exports does not list that file, node throws
-# ERR_PACKAGE_PATH_NOT_EXPORTED, which it can only do once it has found the
-# package, so that error counts as found.
+# node_modules stays deleted. Fail unless node finds the modules the tests
+# load: jest for make test, playwright-core and ethers for tests/e2e/.
 check_js_deps() {
-    run_node <<'EOF'
-const { dependencies, devDependencies } = require("./package.json");
-for (const name of Object.keys({ ...dependencies, ...devDependencies })) {
-    try {
-        require.resolve(name + "/package.json");
-    } catch (e) {
-        if (e.code !== "ERR_PACKAGE_PATH_NOT_EXPORTED") {
-            console.error(`bootstrap: node cannot find ${name} after yarn install`);
-            console.error("  fix: rm -rf node_modules && make bootstrap");
-            process.exit(1);
-        }
-    }
-}
-EOF
+    for module in jest playwright-core ethers; do
+        if ! resolvable "$module"; then
+            echo "bootstrap: node cannot find $module after yarn install" >&2
+            echo "  fix: rm -rf node_modules && make bootstrap" >&2
+            exit 1
+        fi
+    done
 }
 
 main() {