packages/typescript/lib/node/proxyCreateProgram.ts issue

[sgpinkus]

This issue vuejs/language-tools#4783 originates from here:

volar.js/packages/typescript/lib/node/proxyCreateProgram.ts

Line 40 in 15fa6bf

const sourceFileSnapshots = new FileMap<[ts.SourceFile | undefined, ts.IScriptSnapshot | undefined]>(ts.sys.useCaseSensitiveFileNames);

Doing an import of types on line 2 import type * as ts from 'typescript'; seems wrong because your relying on the implementation on line 40 ts.sys.useCaseSensitiveFileNames. Not sure why that would ever work!? I think this can be fixed by changing the import on L2 to import * as ts from 'typescript';