Is it possible for a TypeScript definition file to include a require statement?

Can I include a statement like this in my definition file (.d.ts)?

import foo = require('some-module/bar');

I believed this would automatically convert my definition file into a module. Surprisingly, it still works for me even without strict mode enabled. This is in TypeScript version 3.7.5, in case that makes a difference.

Answer №1

It seems like there might be some confusion between TS import syntax `import = require()` and the Node.JS `require` function.

The TS import notation is specific to CommonJS modules in TypeScript, used along with `export =` in `.d.ts` files.

On the other hand, the Node.JS `require` function is part of the Node.JS global scope and its types can be accessed using `@types/node`. It cannot be used in `.d.ts` files due to restrictions on statements in ambient contexts.

Generally, `.d.ts` files can include import statements for type declarations from other files, typically relative module imports within the project. These imports only affect compile-time, as types are erased at run-time.

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