add typings to `get_store_value` (#5269)

Co-authored-by: Julian Laubstein <contact@julianlaubstein.de>

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
 * Support `<slot slot="...">` ([#2079](https://github.com/sveltejs/svelte/issues/2079))
+* Add types to `get` function in `svelte/store` ([#5269](https://github.com/sveltejs/svelte/pull/5269))
 * Add `EventSource` to known globals ([#5463](https://github.com/sveltejs/svelte/issues/5463))
 * Fix compiler exception with `~`/`+` combinators and `{...spread}` attributes ([#5465](https://github.com/sveltejs/svelte/issues/5465))
 

src/compiler/compile/index.ts

@@ -1,4 +1,3 @@
-import { assign } from '../../runtime/internal/utils';
 import Stats from '../Stats';
 import parse from '../parse/index';
 import render_dom from './render_dom/index';
@@ -68,7 +67,7 @@ function validate_options(options: CompileOptions, warnings: Warning[]) {
 }
 
 export default function compile(source: string, options: CompileOptions = {}) {
-	options = assign({ generate: 'dom', dev: false }, options);
+	options = Object.assign({ generate: 'dom', dev: false }, options);
 
 	const stats = new Stats();
 	const warnings = [];

src/runtime/internal/utils.ts

@@ -1,3 +1,5 @@
+import { Readable } from "svelte/store";
+
 export function noop() {}
 
 export const identity = x => x;
@@ -60,7 +62,7 @@ export function subscribe(store, ...callbacks) {
 	return unsub.unsubscribe ? () => unsub.unsubscribe() : unsub;
 }
 
-export function get_store_value(store) {
+export function get_store_value<T, S extends Readable<T>>(store: S): T {
 	let value;
 	subscribe(store, _ => value = _)();
 	return value;