Review JavaScript module usage and convert CommonJS code to ES modules using import/export. Inspect source code and browser execution, explain how unused code can be removed during builds, and describe how to verify changes.
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Use when reviewing scripts, client components, bundles, or runtime behavior related to Use ES modules (import/export). Inspect both source code and the browser execution path so fixes target the real bottleneck or bug.
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ES modules are statically analyzable — bundlers can determine at build time what code is actually used and eliminate the rest (tree-shaking). CommonJS require() is dynamic and prevents this optimization. ES modules are also the browser-native standard, reducing the need for build-time transformation.
Identify any use of require(), module.exports, or exports in this JavaScript file that should be converted to ES module syntax.
Convert all require() and module.exports statements to ES module import/export syntax.
Explain the benefits of ES modules over CommonJS, including tree-shaking, static analysis, and browser support.
Review scripts, client components, and browser execution paths related to Use ES modules (import/export). Flag exact imports, event handlers, runtime side effects, or blocking operations that violate the rule, and state how the change should be verified in the browser.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/javascript/es-modules
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Create and review custom 404 pages that help visitors recover from broken or moved links through search and navigation. Check the rendered page and HTTP response so missing content returns a proper 404 status.
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Audit or create a dedicated About page that explains a website’s purpose and identifies its people or organization. Review the rendered output and supporting information, including expertise and contact details, to find gaps.
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Review and add automated accessibility checks for components, pages, and continuous integration workflows. Use axe-based tools to detect structural and attribute issues, while identifying checks that still need keyboard or screen reader testing.
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Review sign-in, registration, multi-factor authentication, and account recovery for accessibility barriers. Find blocked paste, difficult code entry, and inaccessible backup methods, then suggest authentication paths that support password managers, autofill, or device approval.
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Review form errors, success messages, and live updates so screen reader users receive important notifications. Check the HTML delivered to the browser, announcement settings, display duration, and dismissal controls, then identify specific elements that need changes.
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Review HTML tables so screen reader users can understand how headers and data relate. Check header markup, table descriptions, and merged cells, then identify specific fixes and ways to verify them.
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