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TypeScript Mapped and Conditional Types Cheat Sheet

A 2-page reference for mapped, conditional and template literal types: 14 short entries with copy-ready code.

ForDevelopers

typescript-mapped-and-conditional-types-cheat-sheet.pdfShowing 13 of 49 lines
// A basic mapped type
type Flags<T> = { [K in keyof T]: boolean };

// Make all properties optional
type MyPartial<T> = { [K in keyof T]?: T[K] };

// Remove readonly and optional
type Mutable<T> = { -readonly [K in keyof T]-?: T[K] };

// Rename keys with as
type Getters<T> = {
  [K in keyof T as `get${Capitalize<string & K>}`]: () => T[K];
};

What's inside

Format
PDF, Markdown
Contents
14 sections · 2 pages
Version
1.0 · Updated 3 Oct 2026
Licence
Commercial What this means
Checked
Checked before it ships
  • typescript-mapped-and-conditional-types-cheat-sheet.pdfPDF · 20 KB
  • typescript-mapped-and-conditional-types-cheat-sheet.mdMarkdown · 2 KB
  • LICENSE.txtadded to every download

About this item

A compact, printable reference for mapped, conditional and template literal types. Each of the 14 entries has a one-line explanation and a small example you can paste into your editor. The PDF uses a two-column A4 layout designed to sit next to your keyboard, and the same content ships as Markdown so you can search it or drop it into your notes. Every TypeScript example targets TypeScript 5.

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