# @latticexyz/react

# Functions

# useComponentValue

▸ useComponentValue<S>(component, entityIndex, defaultValue): ComponentValue<S>

# Type parameters

Name	Type
`S`	extends `Schema`

# Parameters

Name	Type
`component`	`Component`<`S`, `Metadata`, `undefined`>
`entityIndex`	`undefined` \| `EntityIndex`
`defaultValue`	`ComponentValue`<`S`, `undefined`>

# Returns

ComponentValue<S>

# Defined in

useComponentValue.ts:14

▸ useComponentValue<S>(component, entityIndex): ComponentValue<S> | undefined

# Type parameters

Name	Type
`S`	extends `Schema`

# Parameters

Name	Type
`component`	`Component`<`S`, `Metadata`, `undefined`>
`entityIndex`	`undefined` \| `EntityIndex`

# Returns

ComponentValue<S> | undefined

# Defined in

useComponentValue.ts:20

# useDeprecatedComputedValue

▸ useDeprecatedComputedValue<T>(computedValue): T

Deprecated

See https://github.com/latticexyz/mud/issues/339

# Type parameters

Name
`T`

# Parameters

Name	Type
`computedValue`	`IComputedValue`<`T`> & { `observe_`: `any` }

# Returns

T

# Defined in

useDeprecatedComputedValue.ts:5

# useEntityQuery

▸ useEntityQuery(fragments, options?): EntityIndex[]

Returns all matching EntityIndexes for a given entity query, and triggers a re-render as new query results come in.

# Parameters

Name	Type	Description
`fragments`	`QueryFragment`<`Schema`>[]	Query fragments to match against, executed from left to right.
`options?`	`Object`	-
`options.updateOnValueChange?`	`boolean`	False - re-renders only on entity array changes. True (default) - also on component value changes.

# Returns

EntityIndex[]

Set of entities matching the query fragments.

# Defined in

useEntityQuery.ts:18

# useObservableValue

▸ useObservableValue<T>(observable, defaultValue): T

# Type parameters

Name
`T`

# Parameters

Name	Type
`observable`	`Observable`<`T`>
`defaultValue`	`T`

# Returns

T

# Defined in

useObservableValue.ts:4

▸ useObservableValue<T>(observable): T | undefined

# Type parameters

Name
`T`

# Parameters

Name	Type
`observable`	`Observable`<`T`>

# Returns

T | undefined

# Defined in

useObservableValue.ts:6