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Sync svelte docs (#946)
sync svelte docs Co-authored-by: Rich-Harris <[email protected]>
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‎apps/svelte.dev/content/docs/svelte/06-runtime/01-stores.md

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```svelte
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<!--- file: App.svelte --->
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<script>
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import { userState } from './state.svelte';
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import { userState } from './state.svelte.js';
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</script>
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<p>User name: {userState.name}</p>

‎apps/svelte.dev/content/docs/svelte/06-runtime/02-context.md

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```svelte
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<!--- file: App.svelte --->
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<script>
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import { myGlobalState } from './state.svelte';
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import { myGlobalState } from './state.svelte.js';
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// ...
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</script>
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```

‎apps/svelte.dev/content/docs/svelte/98-reference/21-svelte-motion.md

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@@ -6,9 +6,259 @@ title: svelte/motion
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```js
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// @noErrors
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import { prefersReducedMotion, spring, tweened } from 'svelte/motion';
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import {
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Spring,
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Tween,
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prefersReducedMotion,
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spring,
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tweened
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} from 'svelte/motion';
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```
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## Spring
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A wrapper for a value that behaves in a spring-like fashion. Changes to `spring.target` will cause `spring.current` to
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move towards it over time, taking account of the `spring.stiffness` and `spring.damping` parameters.
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```svelte
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<script>
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import { Spring } from 'svelte/motion';
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const spring = new Spring(0);
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</script>
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<input type="range" bind:value={spring.target} />
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<input type="range" bind:value={spring.current} disabled />
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```
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<div class="ts-block">
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```dts
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class Spring<T> {/*…*/}
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```
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<div class="ts-block-property">
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```dts
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constructor(value: T, options?: SpringOpts);
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```
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<div class="ts-block-property-details"></div>
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</div>
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<div class="ts-block-property">
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```dts
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static of<U>(fn: () => U, options?: SpringOpts): Spring<U>;
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```
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<div class="ts-block-property-details">
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Create a spring whose value is bound to the return value of `fn`. This must be called
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inside an effect root (for example, during component initialisation).
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```svelte
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<script>
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import { Spring } from 'svelte/motion';
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let { number } = $props();
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const spring = Spring.of(() => number);
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</script>
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```
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</div>
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</div>
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<div class="ts-block-property">
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```dts
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set(value: T, options?: SpringUpdateOpts): Promise<void>;
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```
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<div class="ts-block-property-details">
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Sets `spring.target` to `value` and returns a `Promise` that resolves if and when `spring.current` catches up to it.
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If `options.instant` is `true`, `spring.current` immediately matches `spring.target`.
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If `options.preserveMomentum` is provided, the spring will continue on its current trajectory for
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the specified number of milliseconds. This is useful for things like 'fling' gestures.
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</div>
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</div>
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<div class="ts-block-property">
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```dts
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damping: number;
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```
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<div class="ts-block-property-details"></div>
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</div>
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<div class="ts-block-property">
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```dts
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precision: number;
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```
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<div class="ts-block-property-details"></div>
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</div>
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<div class="ts-block-property">
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```dts
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stiffness: number;
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```
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<div class="ts-block-property-details"></div>
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</div>
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<div class="ts-block-property">
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```dts
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target: T;
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```
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<div class="ts-block-property-details">
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The end value of the spring.
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This property only exists on the `Spring` class, not the legacy `spring` store.
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</div>
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</div>
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<div class="ts-block-property">
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```dts
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get current(): T;
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```
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The current value of the spring.
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This property only exists on the `Spring` class, not the legacy `spring` store.
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</div>
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</div></div>
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## Tween
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<blockquote class="since note">
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Available since 5.8.0
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</blockquote>
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A wrapper for a value that tweens smoothly to its target value. Changes to `tween.target` will cause `tween.current` to
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move towards it over time, taking account of the `delay`, `duration` and `easing` options.
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```svelte
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<script>
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import { Tween } from 'svelte/motion';
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const tween = new Tween(0);
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</script>
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<input type="range" bind:value={tween.target} />
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<input type="range" bind:value={tween.current} disabled />
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```
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<div class="ts-block">
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```dts
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class Tween<T> {/*…*/}
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```
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<div class="ts-block-property">
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```dts
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static of<U>(fn: () => U, options?: TweenedOptions<U> | undefined): Tween<U>;
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```
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<div class="ts-block-property-details">
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Create a tween whose value is bound to the return value of `fn`. This must be called
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inside an effect root (for example, during component initialisation).
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```svelte
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<script>
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import { Tween } from 'svelte/motion';
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let { number } = $props();
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const tween = Tween.of(() => number);
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</script>
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```
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</div>
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</div>
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<div class="ts-block-property">
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```dts
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constructor(value: T, options?: TweenedOptions<T>);
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```
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<div class="ts-block-property-details"></div>
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</div>
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<div class="ts-block-property">
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```dts
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set(value: T, options?: TweenedOptions<T> | undefined): Promise<void>;
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```
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<div class="ts-block-property-details">
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Sets `tween.target` to `value` and returns a `Promise` that resolves if and when `tween.current` catches up to it.
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If `options` are provided, they will override the tween's defaults.
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</div>
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</div>
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<div class="ts-block-property">
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```dts
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get current(): T;
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```
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<div class="ts-block-property-details"></div>
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</div>
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<div class="ts-block-property">
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```dts
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set target(v: T);
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```
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<div class="ts-block-property-details"></div>
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</div>
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<div class="ts-block-property">
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```dts
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get target(): T;
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```
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<div class="ts-block-property-details"></div>
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</div>
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```dts
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#private;
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```
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<div class="ts-block-property-details"></div>
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</div></div>
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## prefersReducedMotion
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<blockquote class="since note">
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## spring
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<blockquote class="tag deprecated note">
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Use [`Spring`](/docs/svelte/svelte-motion#Spring) instead
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</blockquote>
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The spring function in Svelte creates a store whose value is animated, with a motion that simulates the behavior of a spring. This means when the value changes, instead of transitioning at a steady rate, it "bounces" like a spring would, depending on the physics parameters provided. This adds a level of realism to the transitions and can enhance the user experience.
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<div class="ts-block">
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## tweened
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<blockquote class="tag deprecated note">
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Use [`Tween`](/docs/svelte/svelte-motion#Tween) instead
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</blockquote>
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A tweened store in Svelte is a special type of store that provides smooth transitions between state values over time.
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<div class="ts-block-property">
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```dts
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set: (new_value: T, opts?: SpringUpdateOpts) => Promise<void>;
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set(new_value: T, opts?: SpringUpdateOpts): Promise<void>;
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```
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update: (fn: Updater<T>, opts?: SpringUpdateOpts) => Promise<void>;
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```
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<div class="ts-block-property-details">
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<div class="ts-block-property-bullets">
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- <span class="tag deprecated">deprecated</span> Only exists on the legacy `spring` store, not the `Spring` class
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</div>
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</div>
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</div>
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<div class="ts-block-property">
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```dts
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subscribe(fn: (value: T) => void): Unsubscriber;
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```
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<div class="ts-block-property-details">
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<div class="ts-block-property-bullets">
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- <span class="tag deprecated">deprecated</span> Only exists on the legacy `spring` store, not the `Spring` class
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</div>
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</div>
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</div>
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