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External Types

Unless you’re teaching TypeScript/JavaScript, you’re probably going to want to import libraries into your code samples.

Twoslash works by faking a virtual file system over your existing file system. This means any @types or libraries with TypeScript definitions should work out of the box with no config.

Globals

Setting up globals is a little bit more complex, but not drastically. You need to use the triple slash reference which adds a particular library to the global scope.

import { 
function writeFileSync(file: PathOrFileDescriptor, data: string | NodeJS.ArrayBufferView, options?: WriteFileOptions): void
Returns undefined.


The mode option only affects the newly created file. See


open


for more details.


For detailed information, see the documentation of the asynchronous version of
this API:


writeFile


.
@since ― v0.1.29
@param ― file filename or file descriptor
writeFileSync } from "node:fs";
function writeFileSync(file: PathOrFileDescriptor, data: string | NodeJS.ArrayBufferView, options?: WriteFileOptions): void
Returns undefined.


The mode option only affects the newly created file. See


open


for more details.


For detailed information, see the documentation of the asynchronous version of
this API:


writeFile


.
@since ― v0.1.29
@param ― file filename or file descriptor
writeFileSync("myfile.txt", "// TODO");