Practice
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103 articles · page 4 of 12
Use the satisfies operator to validate objects (routes, feature flags, configs) while preserving literals for great inference and fewer casts.
Stop lying with `as`. Learn production patterns to convert unknown data (fetch, localStorage, env) into safe TypeScript types with guards and assertions.
Use branded (nominal-ish) types to prevent mixing IDs and domain values, and learn safer alternatives to ‘just cast it’.
Use template literal types to make strings type-safe: route patterns, event names, CSS variables, and i18n keys—with realistic examples.
How to type function pipelines like a library author: overloads, variadic tuples, inference boundaries, and what interviewers really want to see.
How to publish different entry points for Node vs browser (or edge) using package.json exports conditions, without breaking TypeScript consumers.
How to use tsconfig paths safely across Next.js, bundlers, Node scripts, and tsc builds—without ‘works locally, fails in prod’.
How TypeScript resolves imports in modern toolchains, when to use NodeNext vs bundler, and how flags like verbatimModuleSyntax affect real projects.
How to structure multi-entry TypeScript packages with package.json exports, prevent deep imports, and ship correct .d.ts for consumers.