From 3f2438ca7c9be3e7de8fd1563b60e6712e91bc22 Mon Sep 17 00:00:00 2001
From: Priyank Gaur <priyankgaur2005@gmail.com>
Date: Tue, 17 Mar 2026 02:13:59 +0530
Subject: [PATCH] fix(client-engine-runtime): make NowGenerator lazy to avoid
 synchronous new Date() calls (#28724)

The Issue: The GeneratorRegistry.snapshot() method creates a snapshot of
all generators, including **NowGenerator**

```
class NowGenerator implements ValueGenerator {
  #now: Date = new Date()

  generate(): string {
    return this.#now.toISOString()
  }
}
```

The **NowGenerator** was initializing new Date() in its property
declaration, meaning it was called synchronously during every query
preparation, even if now() was not used.


The Fix: I modified  **NowGenerator** to be lazy.

```
class NowGenerator implements ValueGenerator {
  #now: Date | undefined

  generate(): string {
    if (this.#now === undefined) {
      this.#now = new Date()
    }
    return this.#now.toISOString()
  }
}
```

The #now field is now initialized as undefined, and new Date() is only
called inside the **generate()**

```
class NanoIdGenerator implements ValueGenerator {
  generate(arg: unknown): string {
    if (typeof arg === 'number') {
      return nanoid(arg)
    } else if (arg === undefined) {
      return nanoid()
    } else {
      throw new Error('Invalid Nanoid generator arguments')
    }
  }
}
```

method if it hasn't been initialized yet.

Fixes #28588

Co-authored-by: jacek-prisma <malec@prisma.io>
---
 packages/client-engine-runtime/src/interpreter/generators.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/packages/client-engine-runtime/src/interpreter/generators.ts b/packages/client-engine-runtime/src/interpreter/generators.ts
index 2fac994fd513..e1f4a972594b 100644
--- a/packages/client-engine-runtime/src/interpreter/generators.ts
+++ b/packages/client-engine-runtime/src/interpreter/generators.ts
@@ -45,9 +45,12 @@ export interface ValueGenerator {
 }
 
 class NowGenerator implements ValueGenerator {
-  #now: Date = new Date()
+  #now: Date | undefined
 
   generate(): string {
+    if (this.#now === undefined) {
+      this.#now = new Date()
+    }
     return this.#now.toISOString()
   }
 }