From 487fee4b77c91e1e8c36dc979bbb94b340364d55 Mon Sep 17 00:00:00 2001
From: John Armstrong <20903247+jlarmstrongiv@users.noreply.github.com>
Date: Mon, 1 Aug 2022 18:40:47 -0400
Subject: [PATCH] fix: check property existence before patching (#52)

Co-authored-by: JounQin <admin@1stg.me>
---
 .changeset/dirty-jobs-live.md |  5 +++++
 package.json                  |  2 +-
 src/shim.ts                   | 20 +++++++++++++++-----
 3 files changed, 21 insertions(+), 6 deletions(-)
 create mode 100644 .changeset/dirty-jobs-live.md

diff --git a/.changeset/dirty-jobs-live.md b/.changeset/dirty-jobs-live.md
new file mode 100644
index 00000000..b9eef2a0
--- /dev/null
+++ b/.changeset/dirty-jobs-live.md
@@ -0,0 +1,5 @@
+---
+"sh-syntax": patch
+---
+
+fix: check property existence before patching
diff --git a/package.json b/package.json
index 85b69f5c..41e93759 100644
--- a/package.json
+++ b/package.json
@@ -71,7 +71,7 @@
     "lint": "run-p lint:*",
     "lint:es": "eslint . --cache -f friendly --max-warnings 10",
     "lint:tsc": "tsc --noEmit",
-    "prepare": "simple-git-hooks",
+    "prepare": "simple-git-hooks || exit 0",
     "prerelease": "pnpm build",
     "release": "changeset publish",
     "test": "vitest run --coverage",
diff --git a/src/shim.ts b/src/shim.ts
index dc1a1f06..750b0f2a 100644
--- a/src/shim.ts
+++ b/src/shim.ts
@@ -1,11 +1,21 @@
+/* eslint-disable @typescript-eslint/no-unnecessary-condition */
+
 import { randomFillSync } from 'node:crypto'
 import _fs from 'node:fs'
 import { performance } from 'node:perf_hooks'
 
-globalThis.fs = _fs
-globalThis.crypto = {
+if (!globalThis.fs) {
+  globalThis.fs = _fs
+}
+
+if (!globalThis.crypto) {
+  globalThis.crypto = {
+    // @ts-expect-error
+    getRandomValues: randomFillSync,
+  }
+}
+
+if (!globalThis.performance) {
   // @ts-expect-error
-  getRandomValues: randomFillSync,
+  globalThis.performance = performance
 }
-// @ts-expect-error
-globalThis.performance = performance