The import attributes should be preserved in .d.ts.

[NWYLZW]

🔎 Search Terms

"import attributes", "import assert", "import with"

🕗 Version & Regression Information

• This changed between versions 4.0 and latest
• This changed in commit or PR _______
• This is the behavior in every version I tried, and I reviewed the FAQ for entries about _________
• I was unable to test this on prior versions because _______

⏯ Playground Link

https://www.typescriptlang.org/play/?#code/KYDwDg9gTgLgBAbzgVwM7AMowIY2HAXzgDMoIBbOAcimGwGMYq4B3ASxgAtFrbUIANshhsIAOwC05CABNgVAFzVpM5APmEAUJtCRYceuNTwkaYAGFsAgQCMGAa0JwAvHGwtsHOG3J6YACho6RioAGh52LiUkIP4hEXEpWXklIIBHZDZaZiICAEpNIA

💻 Code

export { useState } from 'react' with { 'resolution-mode': 'module' }

export const { useCallback } = await import('react', { with: { 'resolution-mode': 'require' } })

🙁 Actual behavior

.d.ts

export { useState } from 'react';
export declare const useCallback: typeof import("react").useCallback;

🙂 Expected behavior

.d.ts

export { useState } from 'react' with { 'resolution-mode': 'module' };
export declare const useCallback: typeof import("react", { with: { 'resolution-mode': 'require' } }).useCallback;

Additional information about the issue

No response

[Jack-Works]

TypeScript is correct in the examples you have given.

export { useState } from 'react' with { 'resolution-mode': 'module' }
export const { useCallback } = await import('react', { with: { 'resolution-mode': 'require' } })

resolution-mode is a type-level feature that will not affect the actual module resolution, thus those attributes will not be used nor emitted in the .d.ts file.

[RyanCavanaugh]

Jack-Works is correct

[typescript-bot]

This issue has been marked as "Not a Defect" and has seen no recent activity. It has been automatically closed for house-keeping purposes.

[NWYLZW]

@RyanCavanaugh

In fact, I am using the API of TypeScript to do some work. For example, I use the emit method to obtain the generated dts file. At this time, when I need the attribute-related descriptions of the corresponding import statement, I cannot obtain them. I can only obtain them through some tricky methods, such as using sourcemap to restore the attributes of the corresponding import statement. But I don't think this is a good thing. We can see that in other compilation tools of TypeScript, such as esbuild and swc, they all provide related APIs:

• esbuild: supported.import-attributes
• swc: jsc.experimental.keepImportAttributes.

If TypeScript can also provide this feature as much as possible, it will be a very good thing for us downstream developers.

Thank you for your confirmation.