edit package.json

Measures tracer startup overhead: how much the loader hooks add when wrapping a representative production dependency graph. everything-fixture/ is a self-contained sub-project (own package.json/package-lock.json/node_modules) curated toward modules dd-trace instruments. Both fixture entries read the same dependencies, so updating package.json covers both:

• index.js loads them with CommonJS require, exercising require-in-the-middle.
• index.mjs loads them with ESM import; the with-tracer-everything-esm variant registers the iitm ESM loader via --import ../../../register.js, so this is the variant that measures the synchronous-vs-asynchronous loader cost.

Updating the fixture

cd benchmark/sirun/startup/everything-fixture
# edit package.json
npm install
git add package.json package-lock.json

Do not commit node_modules/; runall.sh re-installs via npm ci. The bench runs across the Node majors in .gitlab/benchmarks/gitlab-ci.yml, so every pinned version must have an engines.node range including the matrix floor (transitive deps included) and be loadable through CJS require — pin a CJS-era release for ESM-only packages (e.g. got@11, uuid@9), or add an overrides entry for a transitive dep that bumped past the floor.