compilation doesn't omit import that is not used in runtime if typescript alias is created from imported type

[layerok]

Describe the bug

compilation doesn't omit import statement that is not used in runtime if typescript alias is created from imported type

Input code

import {Schemas} from './types.d';
import AddressResource = Schemas.AddressResource;

Config

{}

Playground link (or link to the minimal reproduction)

https://play.swc.rs/?version=1.7.4&code=H4sIAAAAAAAAA8vMLcgvKlGoDk7OSM1NLK5VSCvKz1VQ19MvqSxILdZLUbfm5cqEqHFMSSlKLS4OSi3OLy1KTlWwVYBq0kOTsQYAWJI5D1UAAAA%3D&config=H4sIAAAAAAAAA1VPOw7DIAzdOQXy3CHK0KF36CEQdSIqfsKOVBTl7oUE0maz38fveRVSwps0PORaxrJElQjTuReEsmf1KQhwjkg6mchw6yxTpSZlCXdoOxhglWbk6kIah3FoDrAhEHZHw5zxZsr%2FmTq4mJDoKqxS5WeL10TRUsGF17KT7Zfa92hwh5%2Boh52HwdCzOzktKLYvIO%2B2AhcBAAA%3D

SWC Info output

npx -y swc-info@latest

    Operating System:
        Platform: darwin
        Arch: arm64
        Machine Type: arm64
        Version: Darwin Kernel Version 22.6.0: Wed Jul  5 22:22:52 PDT 2023; root:xnu-8796.141.3~6/RELEASE_ARM64_T8103
        CPU: (8 cores)
            Models: Apple M1

    Binaries:
        Node: 20.0.0
        npm: 9.6.4
        Yarn: 1.22.19
        pnpm: 9.4.0

    Relevant Packages:
        @swc/core: 1.3.89
        @swc/helpers: N/A
        @swc/types: 0.1.12
        

    SWC Config:
        output: N/A
        .swcrc path: N/A

    Next.js info:
        output: N/A
        

Expected behavior

import statement that is unsused in runtime is omitted

Actual behavior

import statement that is unsused in runtime is preserved

Version

1.7.4

Additional context

I'm using swc in my Vite project. After updating swc to version 1.3.89 I started seeing this error in the browser console.

SyntaxError: The requested module './types.d.ts' does not provide an export named 'Schemas'

swc prior to version 1.3.89 omitted import that was unused in runtime. That is why there was no such error in the browser console before.

Also I noticed if I use import type then swc of 1.3.89 version works as expected.

import type {Schemas} from './types.d';
import AddressResource = Schemas.AddressResource;

swc output is

export {};

I guess this issue occured after issue #7177 was fixed.

[magic-akari]

As a workaround, use type import

import type { Schemas } from './types.d';
import type AddressResource = Schemas.AddressResource;

[swc-bot]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.