[Bug Report] [@vant/compat] Toast.loading() is not exported in @vant/compat

[upthen]

Reproduction Link

https://codesandbox.io/p/devbox/vant-4-issue-template-forked-w4kj65?workspaceId=12c348d7-7b7f-4d7b-b190-4ad4456c5cd1&layout=%257B%2522sidebarPanel%2522%253A%2522EXPLORER%2522%252C%2522rootPanelGroup%2522%253A%257B%2522direction%2522%253A%2522horizontal%2522%252C%2522contentType%2522%253A%2522UNKNOWN%2522%252C%2522type%2522%253A%2522PANEL_GROUP%2522%252C%2522id%2522%253A%2522ROOT_LAYOUT%2522%252C%2522panels%2522%253A%255B%257B%2522type%2522%253A%2522PANEL_GROUP%2522%252C%2522contentType%2522%253A%2522UNKNOWN%2522%252C%2522direction%2522%253A%2522vertical%2522%252C%2522id%2522%253A%2522clxmm7pyt00073j6kcl61hqjp%2522%252C%2522sizes%2522%253A%255B60.355912743972446%252C39.644087256027554%255D%252C%2522panels%2522%253A%255B%257B%2522type%2522%253A%2522PANEL_GROUP%2522%252C%2522contentType%2522%253A%2522EDITOR%2522%252C%2522direction%2522%253A%2522horizontal%2522%252C%2522id%2522%253A%2522EDITOR%2522%252C%2522panels%2522%253A%255B%257B%2522type%2522%253A%2522PANEL%2522%252C%2522contentType%2522%253A%2522EDITOR%2522%252C%2522id%2522%253A%2522clxmm7pyt00023j6kfy0ksnku%2522%257D%255D%257D%252C%257B%2522type%2522%253A%2522PANEL_GROUP%2522%252C%2522contentType%2522%253A%2522SHELLS%2522%252C%2522direction%2522%253A%2522horizontal%2522%252C%2522id%2522%253A%2522SHELLS%2522%252C%2522panels%2522%253A%255B%257B%2522type%2522%253A%2522PANEL%2522%252C%2522contentType%2522%253A%2522SHELLS%2522%252C%2522id%2522%253A%2522clxmm7pyt00043j6kc96uhfv4%2522%257D%255D%252C%2522sizes%2522%253A%255B100%255D%257D%255D%257D%252C%257B%2522type%2522%253A%2522PANEL_GROUP%2522%252C%2522contentType%2522%253A%2522DEVTOOLS%2522%252C%2522direction%2522%253A%2522vertical%2522%252C%2522id%2522%253A%2522DEVTOOLS%2522%252C%2522panels%2522%253A%255B%257B%2522type%2522%253A%2522PANEL%2522%252C%2522contentType%2522%253A%2522DEVTOOLS%2522%252C%2522id%2522%253A%2522clxmm7pyt00063j6kvibp3qd9%2522%257D%255D%252C%2522sizes%2522%253A%255B100%255D%257D%255D%252C%2522sizes%2522%253A%255B50%252C50%255D%257D%252C%2522tabbedPanels%2522%253A%257B%2522clxmm7pyt00023j6kfy0ksnku%2522%253A%257B%2522tabs%2522%253A%255B%257B%2522id%2522%253A%2522clxmm7pyt00013j6k8ho4x9g2%2522%252C%2522mode%2522%253A%2522permanent%2522%252C%2522type%2522%253A%2522FILE%2522%252C%2522filepath%2522%253A%2522%252Fsrc%252Findex.js%2522%252C%2522state%2522%253A%2522IDLE%2522%252C%2522initialSelections%2522%253A%255B%257B%2522startLineNumber%2522%253A4%252C%2522startColumn%2522%253A29%252C%2522endLineNumber%2522%253A4%252C%2522endColumn%2522%253A29%257D%255D%257D%252C%257B%2522id%2522%253A%2522clxmm96hi003c3j6ks6hmusj2%2522%252C%2522mode%2522%253A%2522permanent%2522%252C%2522type%2522%253A%2522FILE%2522%252C%2522initialSelections%2522%253A%255B%257B%2522startLineNumber%2522%253A11%252C%2522startColumn%2522%253A21%252C%2522endLineNumber%2522%253A11%252C%2522endColumn%2522%253A21%257D%255D%252C%2522filepath%2522%253A%2522%252Fpackage.json%2522%252C%2522state%2522%253A%2522IDLE%2522%257D%255D%252C%2522id%2522%253A%2522clxmm7pyt00023j6kfy0ksnku%2522%252C%2522activeTabId%2522%253A%2522clxmm7pyt00013j6k8ho4x9g2%2522%257D%252C%2522clxmm7pyt00063j6kvibp3qd9%2522%253A%257B%2522tabs%2522%253A%255B%257B%2522id%2522%253A%2522clxmm7pyt00053j6kukj3ru2s%2522%252C%2522mode%2522%253A%2522permanent%2522%252C%2522type%2522%253A%2522TASK_PORT%2522%252C%2522taskId%2522%253A%2522dev%2522%252C%2522port%2522%253A8080%252C%2522path%2522%253A%2522%252F%2522%257D%255D%252C%2522id%2522%253A%2522clxmm7pyt00063j6kvibp3qd9%2522%252C%2522activeTabId%2522%253A%2522clxmm7pyt00053j6kukj3ru2s%2522%257D%252C%2522clxmm7pyt00043j6kc96uhfv4%2522%253A%257B%2522id%2522%253A%2522clxmm7pyt00043j6kc96uhfv4%2522%252C%2522tabs%2522%253A%255B%257B%2522id%2522%253A%2522clxmm7pyt00033j6kngenompa%2522%252C%2522mode%2522%253A%2522permanent%2522%252C%2522type%2522%253A%2522TASK_LOG%2522%252C%2522taskId%2522%253A%2522dev%2522%257D%255D%252C%2522activeTabId%2522%253A%2522clxmm7pyt00033j6kngenompa%2522%257D%257D%252C%2522showDevtools%2522%253Atrue%252C%2522showShells%2522%253Atrue%252C%2522showSidebar%2522%253Atrue%252C%2522sidebarPanelSize%2522%253A15%257D

Vant Version

4.8.1

Describe the Bug

When I use @vant/compat for my vant upgrade, I import Toast from @vant/compat according to the offical docs upgrade guide,
And this error was throwed:

runtime-core.esm-bundler.js:220 Uncaught TypeError: vant_compat__WEBPACK_IMPORTED_MODULE_0_.Toast.loading is not a function
at Proxy.showLoading (App.vue:8:1)
at callWithErrorHandling (runtime-core.esm-bundler.js:158:1)
at callWithAsyncErrorHandling (runtime-core.esm-bundler.js:166:1)
at emit (runtime-core.esm-bundler.js:671:1)
at runtime-core.esm-bundler.js:7520:1
at onClick (Button.mjs:102:1)
at callWithErrorHandling (runtime-core.esm-bundler.js:158:1)
at callWithAsyncErrorHandling (runtime-core.esm-bundler.js:166:1)
at HTMLButtonElement.invoker (runtime-dom.esm-bundler.js:662:1)

I have read the source code, it seems to not been exported.

Reproduce Steps

reproduce it follow the following steps:

• install vant@4.x and @vant/compat
• import Toast from @vant/compat
• use Toast.loading() in your code
• view the console or the terminal
• then you cloud see this error

Device / Browser

Microsoft Edge 版本 125.0.2535.92 (正式版本) (64 位)