From 8af1e08a20dd27b6a796cf20f8c8722d6c1dedb7 Mon Sep 17 00:00:00 2001
From: Anton Golub <antongolub@antongolub.com>
Date: Tue, 21 Mar 2023 14:05:45 +0300
Subject: [PATCH] fix: do no mutate __metadata

closes #287
---
 src/main/ts/lockfile/v2.ts | 7 ++++---
 src/main/ts/util.ts        | 6 ++++++
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/main/ts/lockfile/v2.ts b/src/main/ts/lockfile/v2.ts
index ff5e45b7..8d7c13ec 100644
--- a/src/main/ts/lockfile/v2.ts
+++ b/src/main/ts/lockfile/v2.ts
@@ -4,10 +4,11 @@ import {
   TLockfileEntry,
   TLockfileObject,
 } from '../ifaces'
-import { formatFlags, formatYaml, invoke, mapFlags, parseYaml } from '../util'
+import {addHiddenProp, formatFlags, formatYaml, invoke, mapFlags, parseYaml} from '../util'
 
 export const parse = (raw: string): TLockfileObject => {
   const data = parseYaml(raw)
+  const {__metadata} = data
   delete data.__metadata
 
   return Object.entries(data).reduce<Record<string, any>>(
@@ -17,7 +18,7 @@ export const parse = (raw: string): TLockfileObject => {
       })
       return m
     },
-    {},
+    addHiddenProp({}, '__metadata', __metadata),
   )
 }
 
@@ -66,7 +67,7 @@ export const format = (lockfile: TLockfileObject): string => {
       return m
     },
     {
-      __metadata: {
+      __metadata: lockfile.__metadata || {
         version: 5,
         cacheKey: 8,
       },
diff --git a/src/main/ts/util.ts b/src/main/ts/util.ts
index 59b19ebd..b1906cdc 100644
--- a/src/main/ts/util.ts
+++ b/src/main/ts/util.ts
@@ -216,3 +216,9 @@ export const getBinVersion = (bin: string, cwd = process.cwd()): string =>
 export const getSelfManifest = () => readJson(
   join(pkgDir(__dirname) + '', 'package.json'), // eslint-disable-line
 )
+
+export const addHiddenProp = (obj: Record<string, any>, prop: string, value: any) =>
+  Object.defineProperty(obj, prop, {
+    value,
+    enumerable: false
+  })