[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › Object Object utilities. ## Constants | Variable | Description | | -------------------------------------------------------------------------- | -------------------------------------- | | [emptyRecord](https://evolu.dev/docs/api-reference/common/Object/variables/emptyRecord) | A shared frozen empty readonly Record. | ## Functions | Function | Description | | ------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [createMutableRecord](https://evolu.dev/docs/api-reference/common/Object/functions/createMutableRecord) | Creates a mutable Record. | | [createObjectURL](https://evolu.dev/docs/api-reference/common/Object/functions/createObjectURL) | Creates a disposable [ObjectURL](https://evolu.dev/docs/api-reference/common/Object/interfaces/ObjectURL) for the given blob. | | [excludeProp](https://evolu.dev/docs/api-reference/common/Object/functions/excludeProp) | Conditionally excludes a property from an object. | | [getObjectKind](https://evolu.dev/docs/api-reference/common/Object/functions/getObjectKind) | Classifies Object representations supported by Evolu's structural data APIs. | | [getOwnProp](https://evolu.dev/docs/api-reference/common/Object/functions/getOwnProp) | Gets an own property from a record, returning `undefined` if the key is missing or inherited. | | [isFunction](https://evolu.dev/docs/api-reference/common/Object/functions/isFunction) | Checks if a value is a function. | | [isIterable](https://evolu.dev/docs/api-reference/common/Object/functions/isIterable) | Checks if a value is [Iterable](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterable_protocol). | | [isPlainObject](https://evolu.dev/docs/api-reference/common/Object/functions/isPlainObject) | Checks if a value is a plain object (e.g., created with `{}` or `Object`). | | [mapObject](https://evolu.dev/docs/api-reference/common/Object/functions/mapObject) | Maps a `ReadonlyRecord` to a new `ReadonlyRecord`, preserving branded key types (e.g., `type Id = 'id' & string`) lost by `Object.entries`. Uses `K extends string` for precision. | | [objectFrom](https://evolu.dev/docs/api-reference/common/Object/functions/objectFrom) | Creates an object by mapping keys to values. | | [objectFromEntries](https://evolu.dev/docs/api-reference/common/Object/functions/objectFromEntries) | Creates an object from key-value pairs, preserving branded key types. | | [objectToEntries](https://evolu.dev/docs/api-reference/common/Object/functions/objectToEntries) | Like `Object.entries` but preserves branded keys. | ## Interfaces | Interface | Description | | ----------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------- | | [ObjectURL](https://evolu.dev/docs/api-reference/common/Object/interfaces/ObjectURL) | A disposable wrapper around `URL.createObjectURL` that automatically revokes the URL when disposed. Use with the `using` declaration for automatic cleanup. | ## Type Aliases | Type Alias | Description | | ----------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [ObjectKind](https://evolu.dev/docs/api-reference/common/Object/type-aliases/ObjectKind) | An Object representation recognized by [getObjectKind](https://evolu.dev/docs/api-reference/common/Object/functions/getObjectKind). | | [ReadonlyRecord](https://evolu.dev/docs/api-reference/common/Object/type-aliases/ReadonlyRecord) | A read-only `Record` with `K extends keyof any` to preserve branded key types (e.g., in [mapObject](https://evolu.dev/docs/api-reference/common/Object/functions/mapObject)). |