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chore(eslint.config): add scoped ESLint blocks to detect CommonJS and ESM mistakes - #6980
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📝 Summary
Pre-merge checks:
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Linked Issues check |  |
The configuration implements the ESM rules, the USA icon exclusion, the CommonJS tooling block, explicit Node globals, and the required warning-level import/extensions rule. The summary reports that… |
Include .storybook/preview.js or provide a separate, reviewable configuration that satisfies the issue's required .storybook/**/*.js coverage while preserving its actual module type. Then rerun npm run lint:js and confirm that no new … |
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Check name Status Explanation Out of Scope Changes check The reviewed diff changes only eslint.config.mjs. The added blocks, rule overrides, and related comments support the scoped ESLint migration in issue#6849. No unrelated source conversion or unrelat…Breaking Change Declared The pull request description contains exactly one approved statement: “This is not a breaking change.” The authoritative diff changes only eslint.config.mjs; it does not change a package JavaScript …No New Runtime Dependency PASS. The pull request changes only eslint.config.mjs. Thedependenciesfields in both repository manifests are unchanged, and no files underpackages/**/src/**/*.jschanged. Therefore, the pull…Regression Test Targets The Change PASS: The review-scoped diff changes only eslint.config.mjs. It does not modify production JavaScript underpackages/**/src/**/*.js, anypackages/**/*.scss, or any test file. The PR changes ESLi…New Api Surface Follow-Ups PASS — The authoritative pull-request diff changes only eslint.config.mjs. It adds ESLint configuration blocks and rules, not a$theme-*setting, public Sass mixin or function,data-*attribute …Accessibility Verification Declared PASS — The pull request changes only eslint.config.mjs. The diff adds ESLint configuration and rules, with no changes to ARIA attributes, focus management, keyboard handling, screen reader text, or …Theme Token Discipline The pull request changes only eslint.config.mjs. The authoritative diff contains no*.scssfile underpackages/, so it introduces no theme-token values or declarations covered by this check.Description check The description directly explains the ESLint configuration changes, their purpose, scoped file behavior, and test result. Title check The title uses the required chore type and scope format, and it accurately describes the scoped ESLint configuration changes. Full details: Out of Scope Changes check
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Explanation
The reviewed diff changes only
eslint.config.mjs. The added blocks, rule overrides, and related comments support the scoped ESLint migration in issue#6849. No unrelated source conversion or unrelated runtime behavior change is present.
Full details: Breaking Change Declared
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Explanation
The pull request description contains exactly one approved statement: “This is not a breaking change.” The authoritative diff changes only
eslint.config.mjs; it does not change a package JavaScript API, a Twig template, a.usa-*class, a$theme-*default, or built CSS behavior.
Full details: No New Runtime Dependency
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Explanation
PASS. The pull request changes only
eslint.config.mjs. Thedependenciesfields in both repository manifests are unchanged, and no files underpackages/**/src/**/*.jschanged. Therefore, the pull request adds neither a consumer dependency nor a new production import that could rely on a transitive dependency.
Full details: Regression Test Targets The Change
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Explanation
PASS: The review-scoped diff changes only
eslint.config.mjs. It does not modify production JavaScript underpackages/**/src/**/*.js, anypackages/**/*.scss, or any test file. The PR changes ESLint tooling configuration, so the regression-test requirement does not apply.
Full details: New Api Surface Follow-Ups
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Explanation
PASS — The authoritative pull-request diff changes only
eslint.config.mjs. It adds ESLint configuration blocks and rules, not a$theme-*setting, public Sass mixin or function,data-*attribute constant, or.usa-*class/modifier. Therefore this API-surface release checklist does not apply.
Full details: Accessibility Verification Declared
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Explanation
PASS — The pull request changes only
eslint.config.mjs. The diff adds ESLint configuration and rules, with no changes to ARIA attributes, focus management, keyboard handling, screen reader text, or form error association. The accessibility test matrix is therefore not applicable.
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Full details: Linked Issues check
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Explanation
The configuration implements the ESM rules, the USA icon exclusion, the CommonJS tooling block, explicit Node globals, and the required warning-level
import/extensionsrule. The summary reports thatnpm run lint:jspasses with only expected warnings. However, issue#6849requires the Node-tooling block to cover.storybook/**/*.js. The changed block covers only.storybook/main.jsand.storybook/test-runner.js;.storybook/preview.jsis explicitly excluded. The reviewed evidence does not show another CommonJS configuration for that required path.Resolution
Include
.storybook/preview.jsor provide a separate, reviewable configuration that satisfies the issue's required.storybook/**/*.jscoverage while preserving its actual module type. Then rerunnpm run lint:jsand confirm that no new errors occur.
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Hi team, the commit is now verified, and the Snyk step in circle-uswds is failing with an enrichment error (SNYK-CLI-0000) that looks unrelated to this change. Could someone re-run the workflow? |
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Summary
Restructured eslint.config.mjs into scoped blocks so ESLint can
distinguish CommonJS files from ESM files and catch the most common
mistake during the CommonJS-to-ESM migration — named imports from a
module that only has a default export.
Breaking change
This is not a breaking change.
Related issue
Closes #6849
Problem statement
eslint.config.mjs was setting languageOptions.sourceType: "module" for
every file in packages/ while also injecting Node's require/module
globals for the same files. This meant ESLint could not distinguish a
CommonJS file from an ESM file and could not catch the most common
conversion mistake.
Solution
Added two new scoped config blocks:
ESM source block — applies to packages//*.js and packages//*.mjs
(excluding packages/usa-icon/src/usa-icons.config.js which is a
Node-side build config). Adds:
as a migration progress signal (flipped to error in final cleanup USWDS - JS: Migration cleanup -- delete the Storybook CJS-to-ESM transform plugin, tighten lint rules, fix stale docs #6869)
Node-tooling block — applies to gulpfile.js, tasks/**/*.js,
.storybook/main.js, .storybook/test-runner.js, svgo.config.js, webpack.twig.config.js, and
packages/usa-icon/src/usa-icons.config.js. Explicitly sets
sourceType: "commonjs" and disables ESM-only rules for files meant to
stay CommonJS permanently.
Major changes
Testing and review
npm run lint:js passes with only the expected import/extensions warnings
on extensionless relative require() calls in packages/ — no new errors.