When working with normal *.d.ts files (which are definition files for TypeScript), we typically use
declare ***
export interface ***
However, there is also this syntax:
/// <reference types="react-scripts" />
This syntax is generated by create-react-app. What does it mean and is it possible to use XML-like syntax in *.d.ts files? Additionally, what other syntax options are available?
/// <reference types="..." />The way these package names are resolved is akin to how module names are resolved in an import statement. Think of triple-slash-reference-types directives as imports for declaration packages. For instance, adding
/// <reference types="node" />@types/node/index.d.ts. Therefore, this package must be included in the compilation process alongside the declaration file.
It is recommended to utilize these directives only when manually creating a d.ts file. Further details on this topic can be found here.
In your specific scenario,
/// <reference types="react-scripts" />node_modules/react-scripts/lib/react-app.d.tsWe hope you found this information useful.
Initially, it's important to grasp that typescript instances recognize a file in either TWO modes: script mode or module mode
In script mode, everything is considered global. What does this mean exactly? For instance:
/**
* global.ts or any other name,
* you can place it ANYWHERE within your project
* The Typescript instance will ALWAYS locate it
**/
declare module '*.glsl' {
const value: string;
export default value;
}
So, how does a typescript instance determine if a file is global? The rule is fairly straightforward - if the file contains no export or import statements, it is considered global. Otherwise, it is not!
/**
import s from 'foo.glsl' from another file, will no longer work
Because there is no definition of *.glsl present
**/
declare module '*.glsl' {
const value: string;
export default value;
}
/**
* The export statement removes the "global" status from this file!
*/
export type T=string
What should one do if they want to utilize declaration files from others in their project without using import, which would invalidate existing declarations?
The solution lies in using
/// <reference types="declaration.d.ts" />import while preserving the file's "globalness."
In reality, placing declaration.d.ts anywhere in the project renders <reference /> unnecessary, as it is inherently global, just like any files lacking export/export
The use of <reference /> proves especially advantageous when the desired declaration file is located in node_module where it is not visible by default
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