A knowledge base distilled from 18 books

JavaScript & TypeScript, clarified.

JavaScript runtime behavior, asynchronous programming, TypeScript’s type system, modules, tooling, testing, and the patterns behind reliable web applications.

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Domains
7
Topics
55
Graph edges
169
JavaScript Runtime SemanticsThe behavior that actually happens when JavaScript runs: values, coercion, equality, objects, properties, prototypes, classes, iteration, and errors.7 topics · 4 cornerstoneFunctions, Scope & Object ModelClosures, this-binding, callables, object composition, classes, private fields, descriptors, references, and collection semantics.8 topics · 3 cornerstoneAsync JavaScriptThe event loop, promises, async/await, microtasks, timers, cancellation, fetch, streams, and practical concurrency patterns.8 topics · 3 cornerstoneTypeScript FundamentalsThe practical type-system core: inference, annotations, structural typing, unions, narrowing, generics, interfaces, and safer boundary types.7 topics · 6 cornerstoneAdvanced TypeScriptConditional types, mapped types, utility types, discriminated unions, type guards, declaration files, brands, and modern type operators.8 topics · 2 cornerstoneModules, Runtime & ToolingNode.js, browser vs server runtimes, package managers, ESM/CJS, tsconfig, module resolution, Vite, targets, and configuration.9 topics · 3 cornerstoneTesting & Code QualityESLint, typescript-eslint, Prettier, Vitest, mocks, async tests, runtime validation, strictness, and maintainable TS discipline.8 topics · 4 cornerstone

Distilled from

  • MDN JavaScript Guide and ReferenceMDN contributors
  • ECMAScript Language SpecificationEcma TC39
  • The TC39 ProcessEcma TC39
  • The TypeScript HandbookTypeScript contributors / Microsoft
  • TypeScript ReferenceTypeScript contributors / Microsoft
  • TypeScript Release NotesTypeScript contributors / Microsoft
  • Effective TypeScript, 2nd EditionDan Vanderkam
  • Eloquent JavaScript, 4th EditionMarijn Haverbeke
  • The Modern JavaScript TutorialIlya Kantor and contributors
  • You Don’t Know JS YetKyle Simpson
  • Node.js Documentation and Learn Node.jsOpenJS Foundation and Node.js contributors
  • Vite DocumentationVite contributors
  • ESLint DocumentationESLint contributors
  • typescript-eslint Documentationtypescript-eslint contributors
  • Prettier DocumentationPrettier contributors
  • Vitest DocumentationVitest contributors
  • npm Documentationnpm contributors
  • pnpm Documentationpnpm contributors