Typescript terms
JavaScript with a safety net and a much better IDE experience
TypeScript adds a powerful static type system to JavaScript, catching errors at compile time and making large codebases dramatically easier to maintain and refactor. This category covers type primitives, generics, utility types, declaration files, strict mode, and the patterns that make TypeScript an upgrade rather than just added ceremony.
Type Guards & Narrowing 2.0 Type guards are expressions that narrow a union type to a more specific type at runtime — telling TypeScript exactly which branch of a union you're in.
4w ago
typescript intermediate
TypeScript Function Overloads
TypeScript function overloads allow a single function to accept different argument shapes and return different types based on which overload signature matches — providing precise type checking that union types alone cannot express.
2mo ago
typescript intermediate
Template Literal Types 4.1
TypeScript template literal types combine string literals with type interpolation — type EventName = `on${Capitalize<string>}` — enabling precise string-pattern type constraints.
2mo ago
typescript advanced
TypeScript Declaration Files (.d.ts) 2.0
Type-only files describing JavaScript code shapes — DefinitelyTyped (@types/* packages) provides community-maintained declarations for popular JS libraries.
2mo ago
typescript advanced
TypeScript Decorators 4.0
Metadata annotations on classes, methods, and properties — used in NestJS, Angular, TypeORM, and class-validator to attach behaviour declaratively.
2mo ago
typescript advanced
TypeScript Enums vs Const Enums vs Union Types 2.0
Three ways to define a set of named constants in TypeScript — regular enums emit JavaScript, const enums are inlined at compile time, and union types are the idiomatic zero-cost alternative.
2mo ago
typescript intermediate
TypeScript Modules & Namespaces 2.0
ES modules (import/export) are the modern standard — namespaces are legacy for global scripts and ambient declarations only.
2mo ago
typescript intermediate
TypeScript vs PHP Type System 4.0
TypeScript uses structural typing (shape compatibility); PHP uses nominal typing (explicit implements). TypeScript infers types; PHP requires annotations. Both support generics (PHP via PHPDoc).
2mo ago
typescript intermediate
tsconfig.json 4.0
The TypeScript compiler configuration file — controlling which files are compiled, what JavaScript version is targeted, strictness settings, and module resolution.
2mo ago
typescript intermediate
TypeScript Generics 2.0 Type parameters that allow functions, classes, and interfaces to work with any type while preserving type information — the TypeScript equivalent of PHP templates or Java generics.
2mo ago
typescript advanced
TypeScript Interfaces vs Type Aliases 2.0 Both define object shapes, but interfaces are open (mergeable via declaration merging) while type aliases are closed — types are more flexible for unions and computed types.
2mo ago
typescript intermediate
TypeScript Strict Mode 2.3
A tsconfig flag that enables the strictest type-checking options — strictNullChecks, noImplicitAny, and others — catching the most common TypeScript pitfalls.
2mo ago
typescript intermediate
TypeScript Type System 2.0
TypeScript adds static types to JavaScript — catching type errors at compile time rather than runtime, while remaining a superset that compiles to plain JavaScript.
2mo ago
typescript intermediate
TypeScript Utility Types 2.1 Built-in generic types that transform existing types — Partial, Required, Pick, Omit, Record, Readonly, ReturnType — eliminating the need to manually duplicate type definitions.
2mo ago
typescript intermediate