FileReader.readyState: use FileReader state constants as possible values (#1475)

Co-authored-by: saschanaz <[email protected]>

Author: StenAL

baselines/dom.generated.d.ts

@@ -5389,7 +5389,7 @@ interface FileReader extends EventTarget {
     onloadend: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
     onloadstart: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
     onprogress: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
-    readonly readyState: number;
+    readonly readyState: typeof FileReader.EMPTY | typeof FileReader.LOADING | typeof FileReader.DONE;
     readonly result: string | ArrayBuffer | null;
     abort(): void;
     readAsArrayBuffer(blob: Blob): void;

baselines/serviceworker.generated.d.ts

@@ -1627,7 +1627,7 @@ interface FileReader extends EventTarget {
     onloadend: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
     onloadstart: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
     onprogress: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
-    readonly readyState: number;
+    readonly readyState: typeof FileReader.EMPTY | typeof FileReader.LOADING | typeof FileReader.DONE;
     readonly result: string | ArrayBuffer | null;
     abort(): void;
     readAsArrayBuffer(blob: Blob): void;

baselines/sharedworker.generated.d.ts

@@ -1532,7 +1532,7 @@ interface FileReader extends EventTarget {
     onloadend: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
     onloadstart: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
     onprogress: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
-    readonly readyState: number;
+    readonly readyState: typeof FileReader.EMPTY | typeof FileReader.LOADING | typeof FileReader.DONE;
     readonly result: string | ArrayBuffer | null;
     abort(): void;
     readAsArrayBuffer(blob: Blob): void;

baselines/webworker.generated.d.ts

@@ -1692,7 +1692,7 @@ interface FileReader extends EventTarget {
     onloadend: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
     onloadstart: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
     onprogress: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
-    readonly readyState: number;
+    readonly readyState: typeof FileReader.EMPTY | typeof FileReader.LOADING | typeof FileReader.DONE;
     readonly result: string | ArrayBuffer | null;
     abort(): void;
     readAsArrayBuffer(blob: Blob): void;

inputfiles/overridingTypes.jsonc

@@ -1923,6 +1923,14 @@
                             "type": "ProgressEvent"
                         }
                     ]
+                },
+                "properties": {
+                    "property": {
+                        "readyState": {
+                            "name": "readyState",
+                            "overrideType": "typeof FileReader.EMPTY | typeof FileReader.LOADING | typeof FileReader.DONE"
+                        }
+                    }
                 }
             },
             "FileSystemDirectoryHandle": {