fix(drizzle-orm): is() crash on objects with null prototype

[markacola]

What

Adds optional chaining (?.) to the Object.getPrototypeOf(value) call in the is() function in entity.ts.

Why

Object.getPrototypeOf() returns null for objects created with Object.create(null). Without optional chaining, accessing .constructor on null throws:

TypeError: Cannot read properties of null (reading 'constructor')

This affects insert and update operations when a user passes an Object.create(null)-based value (e.g. a JSON column value), because the query builder calls is(colValue, SQL) on each column value:

// This crashes without the fix
const jsonValue = Object.create(null);
jsonValue.key = 'value';

db.insert(myTable).values({ name: 'test', data: jsonValue });
db.update(myTable).set({ data: jsonValue }).where(eq(myTable.id, 1));

Changes

• entity.ts — Changed Object.getPrototypeOf(value).constructor to Object.getPrototypeOf(value)?.constructor on line 29.
• is.test.ts — Added 3 test cases:
  • is() returns false (instead of throwing) for Object.create(null) values
  • Insert query building succeeds when a column value is an Object.create(null) object
  • Update query building succeeds when a column value is an Object.create(null) object

All 3 tests produce TypeError: Cannot read properties of null (reading 'constructor') without the fix.