The TypeScript
Cheat Sheet
2026
Utility types, conditional types, template literals, and what actually changes when you move to the TypeScript 7 compiler, on two printable pages. Enter your email and it lands in your inbox in under a minute.
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What's inside
7 sections, 30 patterns, 2 pages
Everything a working TypeScript developer reaches for every week, on one sheet you can pin to your monitor or open in a browser tab.
Utility Types (most-used)
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Partial<T>, Required<T>, Readonly<T> -
Pick<T, K>, Omit<T, K>, Extract<T, U>, Exclude<T, U> -
ReturnType<F>, Parameters<F>, InstanceType<C> -
Awaited<T>, unwrap Promise chains -
NoInfer<T>, new in TS 5.4
Conditional Types
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T extends U ? X : Y, basic form -
infer R, capture type in extends clause -
Distributive conditional types over unions -
never in conditions to filter union members
Template Literal Types
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`${string}` and `${number}` in type position -
Capitalize, Uncapitalize, Uppercase, Lowercase -
Building event maps: `on${Capitalize<EventName>}` -
Combining with mapped types for typed object keys
TypeScript 5.x Highlights
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const type parameters, preserve literal inference -
using declarations, Explicit Resource Management -
Variadic tuple improvements -
satisfies operator, validate without widening
TypeScript 6.0, the bridge release
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--erasableSyntaxOnly, strip-type-safe code -
Isolated declarations for faster parallel builds -
Final JS-based compiler, stage your TS 7 move here -
TS5107 names every option that TS 7 removes
TypeScript 7 (Corsa, GA July 2026)
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tsc is a native Go binary, no Node needed to check -
10x faster: VS Code 77.8s on TS 6, 7.5s on TS 7 -
No new syntax, type semantics mostly unchanged -
rootDir now defaults to ./src, set it explicitly -
Upgrade 5 to 6 to 7, never 5 straight to 7
Common Patterns
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Discriminated unions for exhaustive switch -
Type guards: `x is T` narrowing functions -
Branded types for newtype-style safety -
const assertions `as const` on object literals
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What you get every week
TypeScript patterns
Real utility type usage, generics that actually solve problems, and migration paths from JS. Written from production codebases, not toy examples.
React implementation
Hooks that don't re-render everything, server component patterns, and form handling without 15 dependencies. No tutorial fluff.
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