"Inferred type ... cannot be named" after #55725

[jakebailey]

Pulled out of #56251 (comment)

Running tsc -p tsconfig.build.json (via a script) in https://github.com/vuejs/core with 5.3 causes:

> @3.3.7 build-dts /home/jabaile/work/vuejs-core
> tsc -p tsconfig.build.json && rollup -c rollup.dts.config.js

packages/compiler-sfc/src/parse.ts:96:14 - error TS2742: The inferred type of 'parseCache' cannot be named without a reference to '../node_modules/lru-cache/dist/mjs'. This is likely not portable. A type annotation is necessary.

96 export const parseCache = createCache<SFCParseResult>()
                ~~~~~~~~~~


Found 1 error in packages/compiler-sfc/src/parse.ts:96

 ELIFECYCLE  Command failed with exit code 1.

This is odd, because createCache is defined as:

import { LRUCache } from 'lru-cache'

export function createCache<T extends {}>(
  max = 500
): Map<string, T> | LRUCache<string, T> {
  if (__GLOBAL__ || __ESM_BROWSER__) {
    return new Map<string, T>()
  }
  return new LRUCache({ max })
}

A bisect points to #55725, and we unfortunately didn't run the extended suite there. cc @andrewbranch

I can fix this with an explicit annotation, but this feels weird.

The funkiness here seems to be that this is a monorepo build of all files in various /packages/** dirs, but the output goes into /temp, meaning no d.ts file's imports resolve properly. Before, the export would get an annotation of import("lru-cache"), but now it tries to emit a real import, or something along those lines.

[jakebailey]

Sent vuejs/core#9510 in the meantime to unbreak the build; but not 100% certain that the upstream change is "good" per se.