![]() ![]() Supports enum using its own option, PropTypes.oneOf() ![]() Supports interfaces and enums, declared with keywords interface and enum ![]() Supports interfaces and enums declared with keywords interface and enum Support for interfaces, enums and custom type objects Uses JavaScript types, generic type definitions, and has optional type maybe Uses JavaScript types, generic type definitions, and has optional type nullable Flow team reported in 2019 that recheck time and memory usage were reduced Comparing type-checking libraries/languagesĬonsidered to be the fastest and least buggy In this article, we will focus on TypeScript, Flow, and Prop Types, comparing and contrasting their features and capabilities. There are several languages and libraries that provide statically typed extensions of JavaScript, such as: For this, we need a language that’s a typed extension of JavaScript to check and restrict the types of our variables. To avoid these dynamic type-changing issues with JavaScript, we need to write our programs in another language and then transpile it to JavaScript. While this means that we can write programs a little quicker without giving too much thought to the type a variable should have, it also means that our programs can get buggy and have unexpected behavior as a variable moves through different types. There’s no inbuilt way to annotate or restrict the types of variables. JavaScript is a dynamically typed language, which means that data types of variables are determined by the value they hold at runtime and can change throughout the program as we assign different values to them. TypeScriptĮditor’s note: This post was edited on Octoto add a new implementation, provide a better and easier-to-read comparison format, and discuss the different options more thoroughly. ![]() Comparing statically typed JavaScript implementations PropTypes vs. John Au-Yeung Follow I'm a web developer interested in JavaScript stuff. ![]()
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