fix: add missing realpath and initialize files in memory

In the situation, when there were already some files built in the real
fs, controlled typescript system returned true for fileExists call on
initial run and false on subsequent calls causing assertion in
TypeScript to fail.

✅ Closes: #630

src/typescript-reporter/reporter/ControlledTypeScriptSystem.ts

@@ -150,11 +150,18 @@ function createControlledTypeScriptSystem(
   }
 
   function getReadFileSystem(path: string) {
-    if (
-      !isInitialRun &&
-      (mode === 'readonly' || mode === 'write-tsbuildinfo') &&
-      isArtifact(path)
-    ) {
+    if ((mode === 'readonly' || mode === 'write-tsbuildinfo') && isArtifact(path)) {
+      if (isInitialRun && !memFileSystem.exists(path) && passiveFileSystem.exists(path)) {
+        // copy file to memory on initial run
+        const stats = passiveFileSystem.readStats(path);
+        if (stats?.isFile()) {
+          const content = passiveFileSystem.readFile(path);
+          if (content) {
+            memFileSystem.writeFile(path, content);
+            memFileSystem.updateTimes(path, stats.atime, stats.mtime);
+          }
+        }
+      }
       return memFileSystem;
     }
 
@@ -175,6 +182,9 @@ function createControlledTypeScriptSystem(
   const controlledSystem: ControlledTypeScriptSystem = {
     ...typescript.sys,
     useCaseSensitiveFileNames: caseSensitive,
+    realpath(path: string): string {
+      return getReadFileSystem(path).realPath(path);
+    },
     fileExists(path: string): boolean {
       const stats = getReadFileSystem(path).readStats(path);