TypeScript TypesThe type vocabulary, from primitives to the utility types worth knowing.ComputingThe types you will actually write, grouped by what they do.Basicsstring · number · booleanstring[] or Array<string>[string, number] – tuple'a' | 'b' – union of literalsunknown – safe anynever – cannot happenShapesinterface X { a: string }type Y = { a: string }a?: string – optionalreadonly a: string[key: string]: number – indexUtility typesPartial<T> · Required<T>Pick<T, 'a'> · Omit<T, 'a'>Record<K, V>ReturnType<typeof f>Narrowingtypeof x === 'string''a' in objx instanceof Clsx is Foo – type predicate`unknown` forces you to check before using. `any` disables checkingentirely — it is a hole in the type system, not a type.TypeScript Typeslearnposters.com
TypeScript Types — printable computing wall chart from LearnPosters. Free vector PDF, US Letter and A4.

What’s on the TypeScript Types poster

19 entries in 4 groups.

The types you will actually write, grouped by what they do.

`unknown` forces you to check before using. `any` disables checking entirely — it is a hole in the type system, not a type.

Questions about the TypeScript Types poster

What’s on the TypeScript Types poster?
19 entries in 4 groups. The types you will actually write, grouped by what they do. Basics: string · number · boolean, string[] or Array<string>, [string, number] – tupl…; Shapes: interface X { a: string }, type Y = { a: string }, a?: string – optional, rea…; Utility types: Partial<T> · Required<T>, Pick<T, 'a'> · Omit<T, 'a'>, Record<K, V>, R…; Narrowing: typeof x === 'string', 'a' in obj, x instanceof Cls, x is Foo – type predi…. `unknown` forces you to check before using. `any` disables checking entirely — it is a hole in the type system, not a type.
Who is the TypeScript Types poster for?
TypeScript Types belongs to the Computing section rather than to a school year, because computing is not something one grade owns. Anyone learning languages can pin it up — a beginner, a student mid-course, or someone revising years later.
When should you use the TypeScript Types poster?
Let inference do the work. Annotate function boundaries; leave the middle alone. A wall chart earns its place by being glanceable from where the work is happening, so TypeScript Types belongs on the wall where that computing work actually happens, within glancing distance, rather than filed away.
What other posters go with TypeScript Types?
REST API Design, Bash Scripting and Error Handling sit alongside TypeScript Types in the Computing section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.REST API DesignBash ScriptingError Handling
Is the TypeScript Types poster free to download and print?
Yes. TypeScript Types downloads as a free PDF with no account, no email and no watermark, like everything else in the Computing section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
What size does the TypeScript Types poster print at?
TypeScript Types is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of TypeScript Types loses nothing.Printing guide

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