chore(lint): lint per package to avoid the typescript-eslint project-service ceiling

[kriskowal]

Problem

On large PRs, the root yarn lint:eslint (eslint .) fails with parsing errors on the alphabetically-last packages packages/where/** and packages/zip/**:

0:0  error  Parsing error: ESLint was configured to run on
`<tsconfigRootDir>/packages/where/test/where-endo-cache.test.js`
using `parserOptions.project`:
However, none of those TSConfigs include this file.

Each package's tsconfig.json plainly includes those files (where/zip lint clean when linted on their own), and the base branch lints green, so this is not a config-glob gap or a per-PR code defect. It is a typescript-eslint project-service scaling ceiling: a single eslint . builds one project service that must hold every package's TypeScript program at once, and past a size this monorepo crosses on large PRs the service drops its tail. Two independent large PRs hit the identical where/zip tail-drop with entirely different diffs and neither touches those packages, i.e. size-driven, not diff-driven.

Fix

yarn lint:eslint now delegates to scripts/eslint-repo.mjs, which lints packages/* in bounded buckets of ESLINT_BUCKET_SIZE packages per process (default 10) plus one batch per top-level non-package directory. Each bucket's project service holds only a handful of package programs, far under the whole-repo count that dropped its tail, so the ceiling can never be reached regardless of repository size, while a handful of processes (rather than one per package) amortize ESLint startup. Each bucket is a fresh eslint child process, which the isolation depends on: typescript-eslint's TypeScript program cache is module-global, so linting the buckets in one process would re-accumulate every package's program and re-cross the ceiling.

Coverage matches eslint .: the union of the buckets' directory arguments is exactly packages/* plus every top-level non-package directory, the same paths eslint . walks. Extra args are forwarded, so scripts/eslint-repo.mjs --fix fixes the whole repo. ESLINT_BUCKET_SIZE (default 10) tunes packages-per-process.

Verification

Ran node scripts/eslint-repo.mjs on this branch (against current master): completes green, 0 errors (only the pre-existing compartment-mapper/src/types/policy-schema.ts jsdoc/check-tag-names warning), covering packages/* including where/zip.

[changeset-bot]

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