From e21827e83d20c98a2720a9686bc6d638f0e932a6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Piotr=20Ole=C5=9B?= <piotrek.oles@gmail.com>
Date: Sat, 7 Aug 2021 21:24:11 +0200
Subject: [PATCH] fix: add missing realpath and initialize files in memory
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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
---
 .../reporter/ControlledTypeScriptSystem.ts    | 20 ++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/src/typescript-reporter/reporter/ControlledTypeScriptSystem.ts b/src/typescript-reporter/reporter/ControlledTypeScriptSystem.ts
index d71f7f32..517ecb47 100644
--- a/src/typescript-reporter/reporter/ControlledTypeScriptSystem.ts
+++ b/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);