freeze

The freeze function recursively freezes an object, making it and all its internal objects immutable.

Syntax

freeze(obj: Record<PropertyKey, any>): Record<PropertyKey, any>

Parameters

Name	Type	Description
obj	Record<PropertyKey, any>	Object to be frozen.

Return

Type	Description
Record<PropertyKey, any>	Returns the frozen object, with all properties and internal objects immutable.

Examples

const obj = { a: 1, b: { c: 2 } };
const frozen = freeze(obj);
frozen.a = 10; // No effect
frozen.b.c = 20; // No effect

Notes

• Uses Object.freeze recursively to ensure deep immutability.
• Useful to prevent accidental mutations in data structures.

References

• MDN: Object.freeze()