fix: typescript serviceHost cache miss on Windows operating systems

src/compiler.ts

@@ -35,7 +35,7 @@ import stableStringify = require('fast-json-stable-stringify')
 import { readFileSync, writeFileSync } from 'fs'
 import memoize = require('lodash.memoize')
 import mkdirp = require('mkdirp')
-import { basename, extname, join, relative } from 'path'
+import { basename, extname, join, normalize, relative } from 'path'
 
 import { ConfigSet } from './config/config-set'
 import { MemoryCache, TsCompiler, TypeInfo } from './types'
@@ -136,7 +136,8 @@ export function createCompiler(configs: ConfigSet): TsCompiler {
  const serviceHost = {
  getScriptFileNames: () => Object.keys(memoryCache.versions),
  getScriptVersion: (fileName: string) => {
- const version = memoryCache.versions[fileName]
+ const normalizedFileName = normalize(fileName)
+ const version = memoryCache.versions[normalizedFileName]
 
  // We need to return `undefined` and not a string here because TypeScript will use
  // `getScriptVersion` and compare against their own version - which can be `undefined`.
@@ -146,14 +147,15 @@ export function createCompiler(configs: ConfigSet): TsCompiler {
  return version === undefined ? ((undefined as any) as string) : String(version)
  },
  getScriptSnapshot(fileName: string) {
- const hit = hasOwn.call(memoryCache.contents, fileName)
- logger.trace({ fileName, cacheHit: hit }, `getScriptSnapshot():`, 'cache', hit ? 'hit' : 'miss')
+ const normalizedFileName = normalize(fileName)
+ const hit = hasOwn.call(memoryCache.contents, normalizedFileName)
+ logger.trace({ normalizedFileName, cacheHit: hit }, `getScriptSnapshot():`, 'cache', hit ? 'hit' : 'miss')
  // Read contents from TypeScript memory cache.
  if (!hit) {
- memoryCache.contents[fileName] = ts.sys.readFile(fileName)
+ memoryCache.contents[normalizedFileName] = ts.sys.readFile(normalizedFileName)
  }
 
- const contents = memoryCache.contents[fileName]
+ const contents = memoryCache.contents[normalizedFileName]
  if (contents === undefined) {
  return
  }