![]() Libraries still act as CommonJS when executed in a CommonJS environment. However, while TypeScript is now written with modules, the actual JS files have not changed format. ![]() Moving to modules allows the builders of TypeScript to close the experience gap with their users, speed up the development of TypeScript, and make TypeScript faster, Microsoft said. ES5 ES5 is what most of us have used for years. We want to understand the differences between them, but first we must understand what each of these are and why they exist. Namespaces also brought runtime performance issues. This relationship makes it easier to learn them progressively. Thus, by using namespaces, TypeScript’s builders weren’t using TypeScript the way most of their users are-and missing out on that experience. ![]() Not knowing how compatible ES modules would be with other module systems such as CommonJS, and not seeing a huge benefit for authoring in modules at the time, TypeScript instead used namespaces, formerly called internal modules.Īlthough namespaces had useful features like scopes that could merge across files, making it easy to break up a project across files and expose it as a single variable, most modern JavaScript and TypeScript code is authored using modules. Providing background on the transition, Microsoft said the current TypeScript codebase predates ECMAScript modules, which were standardized in 2015.
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