From 47da31e84f45c08dc8dd630db5404c558f0abf18 Mon Sep 17 00:00:00 2001
From: Simon Holthausen <simon.holthausen@vercel.com>
Date: Thu, 11 May 2023 10:54:30 +0200
Subject: [PATCH] fixes, public/private.dts, d.ts generation

---
 generate-types.mjs                            | 117 +++++++++++++++++
 package.json                                  |   2 +-
 rollup.config.mjs                             |   6 +-
 src/compiler/tsconfig.json                    |   4 +-
 .../action/{index.d.ts => public.d.ts}        |  28 ++--
 src/runtime/animate/index.js                  |   4 +-
 .../animate/{index.d.ts => public.d.ts}       |   0
 src/runtime/index.js                          |   1 -
 src/runtime/internal/Component.js             |   4 +-
 .../internal/ResizeObserverSingleton.js       |  28 ++--
 src/runtime/internal/animations.js            |   6 +-
 src/runtime/internal/await_block.js           |   4 +-
 src/runtime/internal/dev.js                   |  13 +-
 src/runtime/internal/globals.js               |   7 +-
 src/runtime/internal/lifecycle.js             |  13 +-
 src/runtime/internal/loop.js                  |   6 +-
 src/runtime/internal/private.d.ts             |  50 ++++++-
 src/runtime/internal/public.d.ts              |  47 +------
 src/runtime/internal/transitions.js           |   8 +-
 src/runtime/internal/utils.js                 |   2 +-
 src/runtime/motion/private.d.ts               |  28 ++++
 src/runtime/motion/public.d.ts                |  15 +++
 src/runtime/motion/spring.js                  |  52 ++------
 src/runtime/motion/tweened.js                 |  25 +---
 src/runtime/store/index.js                    | 122 ++++++++----------
 src/runtime/store/public.d.ts                 |  61 +++++++++
 src/runtime/transition/index.js               | 116 ++++-------------
 src/runtime/transition/public.d.ts            |  60 +++++++++
 tsconfig.json                                 |   3 +
 29 files changed, 497 insertions(+), 335 deletions(-)
 create mode 100644 generate-types.mjs
 rename src/runtime/action/{index.d.ts => public.d.ts} (67%)
 rename src/runtime/animate/{index.d.ts => public.d.ts} (100%)
 create mode 100644 src/runtime/motion/private.d.ts
 create mode 100644 src/runtime/motion/public.d.ts
 create mode 100644 src/runtime/store/public.d.ts
 create mode 100644 src/runtime/transition/public.d.ts

diff --git a/generate-types.mjs b/generate-types.mjs
new file mode 100644
index 0000000000..a06de292b9
--- /dev/null
+++ b/generate-types.mjs
@@ -0,0 +1,117 @@
+// This script generates the TypeScript definitions
+
+import { execSync } from 'child_process';
+import { readFileSync, writeFileSync, readdirSync, existsSync, copyFileSync } from 'fs';
+
+execSync('tsc -p src/compiler --emitDeclarationOnly && tsc -p src/runtime --emitDeclarationOnly', { stdio: 'inherit' });
+
+function modify(path, modifyFn) {
+	const content = readFileSync(path, 'utf8');
+	writeFileSync(path, modifyFn(content));
+}
+
+function adjust(input) {
+	// Remove typedef jsdoc (duplicated in the type definition)
+	input = input.replace(/\/\*\*\n(\r)? \* @typedef .+?\*\//gs, '');
+	input = input.replace(/\/\*\* @typedef .+?\*\//gs, '');
+
+	// Extract the import paths and types
+	const import_regex = /import\(("|')(.+?)("|')\)\.(\w+)/g;
+	let import_match;
+	const import_map = new Map();
+  
+	while ((import_match = import_regex.exec(input)) !== null) {
+		const imports = import_map.get(import_match[2]) || new Set();
+		imports.add(import_match[4]);
+		import_map.set(import_match[2], imports);
+	}
+  
+	// Replace inline imports with their type names
+	const transformed = input.replace(import_regex, "$4");
+  
+	// Remove/adjust @template, @param and @returns lines
+	// TODO rethink if we really need to do this for @param and @returns, doesn't show up in hover so unnecessary
+	const lines = transformed.split("\n");
+
+	let filtered_lines = [];
+	let removing = null;
+	let openCount = 1;
+	let closedCount = 0;
+
+	for (let line of lines) {
+		let start_removing = false;
+		if (line.trim().startsWith("* @template")) {
+			removing = "template";
+			start_removing = true;
+		}
+
+		if (line.trim().startsWith("* @param {")) {
+			openCount = 1;
+			closedCount = 0;
+			removing = "param";
+			start_removing = true;
+		}
+
+		if (line.trim().startsWith("* @returns {")) {
+			openCount = 1;
+			closedCount = 0;
+			removing = "returns";
+			start_removing = true;
+		}
+
+		if (removing === "returns" || removing === "param") {
+			let i = start_removing ? line.indexOf('{') + 1 : 0;
+			for (; i < line.length; i++) {
+				if (line[i] === "{") openCount++;
+				if (line[i] === "}") closedCount++;
+				if (openCount === closedCount) break;
+			}
+			if (openCount === closedCount) {
+				line = start_removing ? (line.slice(0, line.indexOf('{')) + line.slice(i + 1)) : (` * @${removing} ` + line.slice(i + 1));
+				removing = null;
+			}
+		}
+	  
+		if (removing && !start_removing && (line.trim().startsWith("* @") ||  line.trim().startsWith("*/"))) {
+			removing = null;
+		}
+	  
+		if (!removing) {
+			filtered_lines.push(line);
+		}
+	}
+  
+	// Replace generic type names with their plain versions
+	const renamed_generics = filtered_lines.map(line => {
+		return line.replace(/(\W|\s)([A-Z][\w\d$]*)_\d+(\W|\s)/g, "$1$2$3");
+	});
+  
+	// Generate the import statement for the types used
+	const import_statements = Array.from(import_map.entries())
+		.map(([path, types]) => `import { ${[...types].join(', ')} } from '${path}';`)
+		.join("\n");
+  
+	return [import_statements, ...renamed_generics].join("\n");
+}
+
+for (const dir of readdirSync('types/runtime')) {
+	if (dir.endsWith('.d.ts')) continue;
+
+	modify(
+		`types/runtime/${dir}/index.d.ts`,
+		content => {
+			// TODO adjust all d.ts files
+			content = adjust(content);
+			
+			if (existsSync(`src/runtime/${dir}/public.d.ts`)) {
+				copyFileSync(`src/runtime/${dir}/public.d.ts`, `types/runtime/${dir}/public.d.ts`);
+				content + "\nexport * from './public.js'";
+			}
+
+			return content;
+		}
+	);
+}
+
+copyFileSync(`src/runtime/ambient.d.ts`, `types/runtime/ambient.d.ts`);
+modify(`types/runtime/index.d.ts`, content => content + "\nimport './ambient.js'");
diff --git a/package.json b/package.json
index 9c2ada6782..a10a52feab 100644
--- a/package.json
+++ b/package.json
@@ -92,7 +92,7 @@
     "dev": "rollup -cw",
     "posttest": "agadoo internal/index.mjs",
     "prepublishOnly": "node check_publish_env.js && npm run lint && npm run build && npm test",
-    "tsd": "tsc -p src/compiler --emitDeclarationOnly && tsc -p src/runtime --emitDeclarationOnly",
+    "tsd": "node ./generate-types.mjs",
     "lint": "eslint \"{src,test}/**/*.{ts,js}\" --cache"
   },
   "repository": {
diff --git a/rollup.config.mjs b/rollup.config.mjs
index 54b988b51b..eacdc7d13e 100644
--- a/rollup.config.mjs
+++ b/rollup.config.mjs
@@ -32,7 +32,7 @@ const runtime_entrypoints = Object.fromEntries(
 	fs
 		.readdirSync('src/runtime', { withFileTypes: true })
 		.filter((dirent) => dirent.isDirectory())
-		.map((dirent) => [dirent.name, `src/runtime/${dirent.name}/index.ts`])
+		.map((dirent) => [dirent.name, `src/runtime/${dirent.name}/index.js`])
 );
 
 /**
@@ -42,8 +42,8 @@ export default [
 	{
 		input: {
 			...runtime_entrypoints,
-			index: 'src/runtime/index.ts',
-			ssr: 'src/runtime/ssr.ts'
+			index: 'src/runtime/index.js',
+			ssr: 'src/runtime/ssr.js'
 		},
 		output: ['es', 'cjs'].map(
 			/** @returns {import('rollup').OutputOptions} */
diff --git a/src/compiler/tsconfig.json b/src/compiler/tsconfig.json
index c5939a0fdc..c7395a0c8d 100644
--- a/src/compiler/tsconfig.json
+++ b/src/compiler/tsconfig.json
@@ -3,7 +3,9 @@
 	"include": ["."],
 
 	"compilerOptions": {
-		"lib": ["es2017", "webworker"]
+		"lib": ["es2017", "webworker"],
+		"allowJs": true,
+		"checkJs": true
 
 		// TODO: remove mocha types from the whole project
 		// "types": ["node", "estree"]
diff --git a/src/runtime/action/index.d.ts b/src/runtime/action/public.d.ts
similarity index 67%
rename from src/runtime/action/index.d.ts
rename to src/runtime/action/public.d.ts
index b36a8d82ce..0abde77f80 100644
--- a/src/runtime/action/index.d.ts
+++ b/src/runtime/action/public.d.ts
@@ -1,8 +1,7 @@
 /**
  * Actions can return an object containing the two properties defined in this interface. Both are optional.
  * - update: An action can have a parameter. This method will be called whenever that parameter changes,
- *   immediately after Svelte has applied updates to the markup. `ActionReturn` and `ActionReturn<never>` both
- *   mean that the action accepts no parameters, which makes it illegal to set the `update` method.
+ *   immediately after Svelte has applied updates to the markup.
  * - destroy: Method that is called after the element is unmounted
  *
  * Additionally, you can specify which additional attributes and events the action enables on the applied element.
@@ -27,10 +26,10 @@
  * Docs: https://svelte.dev/docs#template-syntax-element-directives-use-action
  */
 export interface ActionReturn<
-	Parameter = never,
+	Parameter = any,
 	Attributes extends Record<string, any> = Record<never, any>
 > {
-	update?: [Parameter] extends [never] ? never : (parameter: Parameter) => void;
+	update?: (parameter: Parameter) => void;
 	destroy?: () => void;
 	/**
 	 * ### DO NOT USE THIS
@@ -46,12 +45,10 @@ export interface ActionReturn<
  * The following example defines an action that only works on `<div>` elements
  * and optionally accepts a parameter which it has a default value for:
  * ```ts
- * export const myAction: Action<HTMLDivElement, { someProperty: boolean } | undefined> = (node, param = { someProperty: true }) => {
+ * export const myAction: Action<HTMLDivElement, { someProperty: boolean }> = (node, param = { someProperty: true }) => {
  *   // ...
  * }
  * ```
- * `Action<HTMLDivElement>` and `Action<HTMLDiveElement, never>` both signal that the action accepts no parameters.
- *
  * You can return an object with methods `update` and `destroy` from the function and type which additional attributes and events it has.
  * See interface `ActionReturn` for more details.
  *
@@ -59,18 +56,11 @@ export interface ActionReturn<
  */
 export interface Action<
 	Element = HTMLElement,
-	Parameter = never,
+	Parameter = any,
 	Attributes extends Record<string, any> = Record<never, any>
 > {
-	<Node extends Element>(
-		...args: [Parameter] extends [never]
-			? [node: Node]
-			: undefined extends Parameter
-			? [node: Node, parameter?: Parameter]
-			: [node: Node, parameter: Parameter]
-	): void | ActionReturn<Parameter, Attributes>;
+	<Node extends Element>(node: Node, parameter?: Parameter): void | ActionReturn<
+		Parameter,
+		Attributes
+	>;
 }
-
-// Implementation notes:
-// - undefined extends X instead of X extends undefined makes this work better with both strict and nonstrict mode
-// - [X] extends [never] is needed, X extends never would reduce the whole resulting type to never and not to one of the condition outcomes
diff --git a/src/runtime/animate/index.js b/src/runtime/animate/index.js
index 2637626cdd..7e301009cb 100644
--- a/src/runtime/animate/index.js
+++ b/src/runtime/animate/index.js
@@ -4,8 +4,8 @@ import { is_function } from '../internal/index.js';
 /**
  * @param {Element} node
  * @param {{ from: DOMRect; to: DOMRect }} fromTo
- * @param {import('.').FlipParams} params
- * @returns {import('.').AnimationConfig}
+ * @param {import('./public.js').FlipParams} params
+ * @returns {import('./public.js').AnimationConfig}
  */
 export function flip(node, { from, to }, params = {}) {
 	const style = getComputedStyle(node);
diff --git a/src/runtime/animate/index.d.ts b/src/runtime/animate/public.d.ts
similarity index 100%
rename from src/runtime/animate/index.d.ts
rename to src/runtime/animate/public.d.ts
diff --git a/src/runtime/index.js b/src/runtime/index.js
index 9900f7018d..9d17708fe4 100644
--- a/src/runtime/index.js
+++ b/src/runtime/index.js
@@ -1,4 +1,3 @@
-import './ambient.js';
 export {
 	onMount,
 	onDestroy,
diff --git a/src/runtime/internal/Component.js b/src/runtime/internal/Component.js
index 8769286875..ad39801d35 100644
--- a/src/runtime/internal/Component.js
+++ b/src/runtime/internal/Component.js
@@ -95,7 +95,7 @@ export function init(
 ) {
 	const parent_component = current_component;
 	set_current_component(component);
-	/** @type {import('./public.d.ts').T$$} */
+	/** @type {import('./private.js').T$$} */
 	const $$ = (component.$$ = {
 		fragment: null,
 		ctx: [],
@@ -352,7 +352,7 @@ function get_custom_element_value(prop, value, props_definition, transform) {
  * @internal
  *
  * Turn a Svelte component into a custom element.
- * @param {import('./public.d.ts').ComponentType} Component  A Svelte component constructor
+ * @param {import('./public.js').ComponentType} Component  A Svelte component constructor
  * @param {Record<string, CustomElementPropDefinition>} props_definition  The props to observe
  * @param {string[]} slots  The slots to create
  * @param {string[]} accessors  Other accessors besides the ones for props the component has
diff --git a/src/runtime/internal/ResizeObserverSingleton.js b/src/runtime/internal/ResizeObserverSingleton.js
index 707356a40e..a9e895ea88 100644
--- a/src/runtime/internal/ResizeObserverSingleton.js
+++ b/src/runtime/internal/ResizeObserverSingleton.js
@@ -6,14 +6,30 @@ import { globals } from './globals.js';
  * https://groups.google.com/a/chromium.org/g/blink-dev/c/z6ienONUb5A/m/F5-VcUZtBAAJ
  */
 export class ResizeObserverSingleton {
+	/**
+	 * @private
+	 * @readonly
+	 * @type {WeakMap<Element, import('./private.js').Listener>}
+	 */
+	_listeners = 'WeakMap' in globals ? new WeakMap() : undefined;
+
+	/**
+	 * @private
+	 * @type {ResizeObserver}
+	 */
+	_observer = undefined;
+
+	/** @type {ResizeObserverOptions} */
 	options;
+
+	/** @param {ResizeObserverOptions} options */
 	constructor(options) {
 		this.options = options;
 	}
 
 	/**
 	 * @param {Element} element
-	 * @param {import('./private.d.ts').Listener} listener
+	 * @param {import('./private.js').Listener} listener
 	 * @returns {() => void}
 	 */
 	observe(element, listener) {
@@ -27,16 +43,6 @@ export class ResizeObserverSingleton {
 
 	/**
 	 * @private
-	 * @readonly
-	 * @default 'WeakMap' in globals ? new WeakMap() : undefined
-	 */
-	_listeners = 'WeakMap' in globals ? new WeakMap() : undefined;
-
-	/** @private */
-	_observer = undefined;
-
-	/** @private
-	 * @returns {ResizeObserver}
 	 */
 	_getObserver() {
 		return (
diff --git a/src/runtime/internal/animations.js b/src/runtime/internal/animations.js
index 87b234fae1..a589413841 100644
--- a/src/runtime/internal/animations.js
+++ b/src/runtime/internal/animations.js
@@ -5,8 +5,8 @@ import { create_rule, delete_rule } from './style_manager.js';
 
 /**
  * @param {Element & ElementCSSInlineStyle} node
- * @param {import('./private.d.ts').PositionRect} from
- * @param {import('./private.d.ts').AnimationFn} fn
+ * @param {import('./private.js').PositionRect} from
+ * @param {import('./private.js').AnimationFn} fn
  * @returns {any}
  */
 export function create_animation(node, from, fn, params) {
@@ -88,7 +88,7 @@ export function fix_position(node) {
 
 /**
  * @param {Element & ElementCSSInlineStyle} node
- * @param {import('./private.d.ts').PositionRect} a
+ * @param {import('./private.js').PositionRect} a
  * @returns {void}
  */
 export function add_transform(node, a) {
diff --git a/src/runtime/internal/await_block.js b/src/runtime/internal/await_block.js
index 5a9287b197..fed0f10470 100644
--- a/src/runtime/internal/await_block.js
+++ b/src/runtime/internal/await_block.js
@@ -6,13 +6,13 @@ import { get_current_component, set_current_component } from './lifecycle.js';
 /**
  * @template T
  * @param {Promise<T>} promise
- * @param {import('./private.d.ts').PromiseInfo<T>} info
+ * @param {import('./private.js').PromiseInfo<T>} info
  * @returns {boolean}
  */
 export function handle_promise(promise, info) {
 	const token = (info.token = {});
 	/**
-	 * @param {import('./public.d.ts').FragmentFactory} type
+	 * @param {import('./private.js').FragmentFactory} type
 	 * @param {0 | 1 | 2} index
 	 * @param {number} [key]
 	 * @param {any} [value]
diff --git a/src/runtime/internal/dev.js b/src/runtime/internal/dev.js
index 1d9dbc2ef6..135e0988ab 100644
--- a/src/runtime/internal/dev.js
+++ b/src/runtime/internal/dev.js
@@ -294,9 +294,9 @@ export function construct_svelte_component_dev(component, props) {
  * </script>
  * <MyComponent foo={'bar'} />
  * ```
- * @template {Record<string, any>} Props
- * @template {Record<string, any>} Events
- * @template {Record<string, any>} Slots
+ * @template {Record<string, any>} [Props=any]
+ * @template {Record<string, any>} [Events=any]
+ * @template {Record<string, any>} [Slots=any]
  * @extends SvelteComponent
  */
 export class SvelteComponentDev extends SvelteComponent {
@@ -325,6 +325,7 @@ export class SvelteComponentDev extends SvelteComponent {
 	/** @type {Slots} */
 	$$slot_def = undefined;
 
+	/** @param {import('./public.js').ComponentConstructorOptions<Props>} options */
 	constructor(options) {
 		if (!options || (!options.target && !options.$$inline)) {
 			throw new Error("'target' is a required option");
@@ -347,9 +348,9 @@ export class SvelteComponentDev extends SvelteComponent {
 	$inject_state() {}
 }
 /**
- * @template {Record<string, any>} Props
- * @template {Record<string, any>} Events
- * @template {Record<string, any>} Slots
+ * @template {Record<string, any>} [Props=any]
+ * @template {Record<string, any>} [Events=any]
+ * @template {Record<string, any>} [Slots=any]
  * @deprecated Use `SvelteComponent` instead. See PR for more information: https://github.com/sveltejs/svelte/pull/8512
  * @extends SvelteComponentDev<Props, Events, Slots>
  */
diff --git a/src/runtime/internal/globals.js b/src/runtime/internal/globals.js
index 15cf9ae259..bd21be49ed 100644
--- a/src/runtime/internal/globals.js
+++ b/src/runtime/internal/globals.js
@@ -1,3 +1,8 @@
 /** @type {typeof globalThis} */
 export const globals =
-	typeof window !== 'undefined' ? window : typeof globalThis !== 'undefined' ? globalThis : global;
+	typeof window !== 'undefined'
+		? window
+		: typeof globalThis !== 'undefined'
+		? globalThis
+		: // @ts-ignore Node typings have this
+		  global;
diff --git a/src/runtime/internal/lifecycle.js b/src/runtime/internal/lifecycle.js
index c054a6098c..68c02eced9 100644
--- a/src/runtime/internal/lifecycle.js
+++ b/src/runtime/internal/lifecycle.js
@@ -92,7 +92,7 @@ export function onDestroy(fn) {
  *
  * https://svelte.dev/docs#run-time-svelte-createeventdispatcher
  * @template {Record<string, any>} EventMap
- * @returns {import('./public.d.ts').EventDispatcher<EventMap>}
+ * @returns {import('./public.js').EventDispatcher<EventMap>}
  */
 export function createEventDispatcher() {
 	const component = get_current_component();
@@ -120,6 +120,7 @@ export function createEventDispatcher() {
  *
  * https://svelte.dev/docs#run-time-svelte-setcontext
  * @template T
+ * @param {string} key
  * @param {T} context
  * @returns {T}
  */
@@ -134,6 +135,7 @@ export function setContext(key, context) {
  *
  * https://svelte.dev/docs#run-time-svelte-getcontext
  * @template T
+ * @param {string} key
  * @returns {T}
  */
 export function getContext(key) {
@@ -146,7 +148,7 @@ export function getContext(key) {
  * programmatically create a component and want to pass the existing context to it.
  *
  * https://svelte.dev/docs#run-time-svelte-getallcontexts
- * @template T
+ * @template {Map<any, any>} [T=Map<any, any>]
  * @returns {T}
  */
 export function getAllContexts() {
@@ -158,6 +160,7 @@ export function getAllContexts() {
  * Must be called during component initialisation.
  *
  * https://svelte.dev/docs#run-time-svelte-hascontext
+ * @param {string} key
  * @returns {boolean}
  */
 export function hasContext(key) {
@@ -167,7 +170,11 @@ export function hasContext(key) {
 // TODO figure out if we still want to support
 // shorthand events, or if we want to implement
 // a real bubbling mechanism
-/** @returns {void} */
+/**
+ * @param component
+ * @param event
+ * @returns {void}
+ */
 export function bubble(component, event) {
 	const callbacks = component.$$.callbacks[event.type];
 	if (callbacks) {
diff --git a/src/runtime/internal/loop.js b/src/runtime/internal/loop.js
index c5bde437d4..5a14565600 100644
--- a/src/runtime/internal/loop.js
+++ b/src/runtime/internal/loop.js
@@ -27,11 +27,11 @@ export function clear_loops() {
 /**
  * Creates a new task that runs on each raf frame
  * until it returns a falsy value or is aborted
- * @param {import('./private.d.ts').TaskCallback} callback
- * @returns {import('./public.d.ts').Task}
+ * @param {import('./private.js').TaskCallback} callback
+ * @returns {import('./private.js').Task}
  */
 export function loop(callback) {
-	/** @type {import('./private.d.ts').TaskEntry} */
+	/** @type {import('./private.js').TaskEntry} */
 	let task;
 	if (tasks.size === 0) raf(run_tasks);
 	return {
diff --git a/src/runtime/internal/private.d.ts b/src/runtime/internal/private.d.ts
index 2ae88b3cc4..50f4a9046b 100644
--- a/src/runtime/internal/private.d.ts
+++ b/src/runtime/internal/private.d.ts
@@ -1,5 +1,4 @@
-import type { AnimationConfig } from '../animate';
-import type { Fragment, FragmentFactory } from './public';
+import type { AnimationConfig } from '../animate/public.js';
 
 export type AnimationFn = (
 	node: Element,
@@ -7,7 +6,7 @@ export type AnimationFn = (
 	params: any
 ) => AnimationConfig;
 
-type Listener = (entry: ResizeObserverEntry) => any;
+export type Listener = (entry: ResizeObserverEntry) => any;
 
 //todo: documentation says it is DOMRect, but in IE it would be ClientRect
 export type PositionRect = DOMRect | ClientRect;
@@ -79,3 +78,48 @@ export interface StyleInformation {
 export type TaskCallback = (now: number) => boolean | void;
 
 export type TaskEntry = { c: TaskCallback; f: () => void };
+
+/**
+ * INTERNAL, DO NOT USE. Code may change at any time.
+ */
+export interface Fragment {
+	key: string | null;
+	first: null;
+	/* create  */ c: () => void;
+	/* claim   */ l: (nodes: any) => void;
+	/* hydrate */ h: () => void;
+	/* mount   */ m: (target: HTMLElement, anchor: any) => void;
+	/* update  */ p: (ctx: T$$['ctx'], dirty: T$$['dirty']) => void;
+	/* measure */ r: () => void;
+	/* fix     */ f: () => void;
+	/* animate */ a: () => void;
+	/* intro   */ i: (local: any) => void;
+	/* outro   */ o: (local: any) => void;
+	/* destroy */ d: (detaching: 0 | 1) => void;
+}
+
+export type FragmentFactory = (ctx: any) => Fragment;
+
+export interface T$$ {
+	dirty: number[];
+	ctx: any[];
+	bound: any;
+	update: () => void;
+	callbacks: any;
+	after_update: any[];
+	props: Record<string, 0 | string>;
+	fragment: null | false | Fragment;
+	not_equal: any;
+	before_update: any[];
+	context: Map<any, any>;
+	on_mount: any[];
+	on_destroy: any[];
+	skip_bound: boolean;
+	on_disconnect: any[];
+	root: Element | ShadowRoot;
+}
+
+export interface Task {
+	abort(): void;
+	promise: Promise<void>;
+}
diff --git a/src/runtime/internal/public.d.ts b/src/runtime/internal/public.d.ts
index de7d87bb54..62a3d8edc8 100644
--- a/src/runtime/internal/public.d.ts
+++ b/src/runtime/internal/public.d.ts
@@ -1,4 +1,4 @@
-import type { SvelteComponent } from './Component';
+import type { SvelteComponent } from './Component.js';
 
 export interface ComponentConstructorOptions<
 	Props extends Record<string, any> = Record<string, any>
@@ -91,27 +91,6 @@ export interface EventDispatcher<EventMap extends Record<string, any>> {
 	): boolean;
 }
 
-/**
- * INTERNAL, DO NOT USE. Code may change at any time.
- */
-export interface Fragment {
-	key: string | null;
-	first: null;
-	/* create  */ c: () => void;
-	/* claim   */ l: (nodes: any) => void;
-	/* hydrate */ h: () => void;
-	/* mount   */ m: (target: HTMLElement, anchor: any) => void;
-	/* update  */ p: (ctx: T$$['ctx'], dirty: T$$['dirty']) => void;
-	/* measure */ r: () => void;
-	/* fix     */ f: () => void;
-	/* animate */ a: () => void;
-	/* intro   */ i: (local: any) => void;
-	/* outro   */ o: (local: any) => void;
-	/* destroy */ d: (detaching: 0 | 1) => void;
-}
-
-export type FragmentFactory = (ctx: any) => Fragment;
-
 export interface SvelteComponentDev<
 	Props extends Record<string, any> = any,
 	Events extends Record<string, any> = any,
@@ -126,33 +105,9 @@ export interface SvelteComponentDev<
 	[accessor: string]: any;
 }
 
-export interface T$$ {
-	dirty: number[];
-	ctx: any[];
-	bound: any;
-	update: () => void;
-	callbacks: any;
-	after_update: any[];
-	props: Record<string, 0 | string>;
-	fragment: null | false | Fragment;
-	not_equal: any;
-	before_update: any[];
-	context: Map<any, any>;
-	on_mount: any[];
-	on_destroy: any[];
-	skip_bound: boolean;
-	on_disconnect: any[];
-	root: Element | ShadowRoot;
-}
-
 // eslint-disable-next-line @typescript-eslint/no-empty-interface
 export interface SvelteComponentTyped<
 	Props extends Record<string, any> = any,
 	Events extends Record<string, any> = any,
 	Slots extends Record<string, any> = any
 > extends SvelteComponentDev<Props, Events, Slots> {}
-
-export interface Task {
-	abort(): void;
-	promise: Promise<void>;
-}
diff --git a/src/runtime/internal/transitions.js b/src/runtime/internal/transitions.js
index fb15ce7fca..9da6270be2 100644
--- a/src/runtime/internal/transitions.js
+++ b/src/runtime/internal/transitions.js
@@ -60,7 +60,7 @@ export function check_outros() {
 }
 
 /**
- * @param {import('./public.js').Fragment} block
+ * @param {import('./private.js').Fragment} block
  * @param {0 | 1} [local]
  * @returns {void}
  */
@@ -72,7 +72,7 @@ export function transition_in(block, local) {
 }
 
 /**
- * @param {import('./public.js').Fragment} block
+ * @param {import('./private.js').Fragment} block
  * @param {0 | 1} local
  * @param {0 | 1} detach
  * @returns {void}
@@ -95,7 +95,7 @@ export function transition_out(block, local, detach, callback) {
 }
 
 /**
- * @type {import('types/transition').TransitionConfig}
+ * @type {import('../transition/public.js').TransitionConfig}
  */
 const null_transition = { duration: 0 };
 
@@ -401,7 +401,7 @@ export function create_bidirectional_transition(node, fn, params, intro) {
 /** @typedef {1} INTRO */
 /** @typedef {0} OUTRO */
 /** @typedef {{ direction: 'in' | 'out' | 'both' }} TransitionOptions */
-/** @typedef {(node: Element, params: any, options: TransitionOptions) => import('types/transition').TransitionConfig} TransitionFn */
+/** @typedef {(node: Element, params: any, options: TransitionOptions) => import('../transition/public.js').TransitionConfig} TransitionFn */
 
 /**
  * @typedef {Object} Outro
diff --git a/src/runtime/internal/utils.js b/src/runtime/internal/utils.js
index c5851738d2..524b3218a2 100644
--- a/src/runtime/internal/utils.js
+++ b/src/runtime/internal/utils.js
@@ -112,7 +112,7 @@ export function subscribe(store, ...callbacks) {
 
 /**
  * @template T
- * @param {import('../store').Readable<T>} store
+ * @param {import('../store/public.js').Readable<T>} store
  * @returns {T}
  */
 export function get_store_value(store) {
diff --git a/src/runtime/motion/private.d.ts b/src/runtime/motion/private.d.ts
new file mode 100644
index 0000000000..7a39983d48
--- /dev/null
+++ b/src/runtime/motion/private.d.ts
@@ -0,0 +1,28 @@
+import { Spring } from './public';
+
+export interface TickContext<T> {
+	inv_mass: number;
+	dt: number;
+	opts: Spring<T>;
+	settled: boolean;
+}
+
+export interface SpringOpts {
+	stiffness?: number;
+	damping?: number;
+	precision?: number;
+}
+
+export interface SpringUpdateOpts {
+	hard?: any;
+	soft?: string | number | boolean;
+}
+
+export type Updater<T> = (target_value: T, value: T) => T;
+
+export interface TweenedOptions<T> {
+	delay?: number;
+	duration?: number | ((from: T, to: T) => number);
+	easing?: (t: number) => number;
+	interpolate?: (a: T, b: T) => (t: number) => T;
+}
diff --git a/src/runtime/motion/public.d.ts b/src/runtime/motion/public.d.ts
new file mode 100644
index 0000000000..372d31636f
--- /dev/null
+++ b/src/runtime/motion/public.d.ts
@@ -0,0 +1,15 @@
+import { Readable } from '../store/public.js';
+import { SpringUpdateOpts, TweenedOptions, Updater } from './private';
+
+export interface Spring<T> extends Readable<T> {
+	set: (new_value: T, opts?: SpringUpdateOpts) => Promise<void>;
+	update: (fn: Updater<T>, opts?: SpringUpdateOpts) => Promise<void>;
+	precision: number;
+	damping: number;
+	stiffness: number;
+}
+
+export interface Tweened<T> extends Readable<T> {
+	set(value: T, opts?: TweenedOptions<T>): Promise<void>;
+	update(updater: Updater<T>, opts?: TweenedOptions<T>): Promise<void>;
+}
diff --git a/src/runtime/motion/spring.js b/src/runtime/motion/spring.js
index f78078c9e5..3c6fb6b06a 100644
--- a/src/runtime/motion/spring.js
+++ b/src/runtime/motion/spring.js
@@ -3,7 +3,8 @@ import { loop, now } from '../internal/index.js';
 import { is_date } from './utils.js';
 
 /**
- * @param {TickContext<T>} ctx
+ * @template T
+ * @param {import('./private.js').TickContext<T>} ctx
  * @param {T} last_value
  * @param {T} current_value
  * @param {T} target_value
@@ -45,16 +46,17 @@ function tick_spring(ctx, last_value, current_value, target_value) {
 }
 
 /**
+ * @template T
  * @param {T} value
- * @param {SpringOpts} opts
- * @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/spring.ts-to-jsdoc").Spring<T>}
+ * @param {import('./private.js').SpringOpts} opts
+ * @returns {import('./public.js').Spring<T>}
  */
 export function spring(value, opts = {}) {
 	const store = writable(value);
 	const { stiffness = 0.15, damping = 0.8, precision = 0.01 } = opts;
 	/** @type {number} */
 	let last_time;
-	/** @type {Task} */
+	/** @type {import('../internal/private.js').Task} */
 	let task;
 	/** @type {object} */
 	let current_token;
@@ -65,8 +67,9 @@ export function spring(value, opts = {}) {
 	let inv_mass = 1;
 	let inv_mass_recovery_rate = 0;
 	let cancel_task = false;
-	/** @param {T} new_value
-	 * @param {SpringUpdateOpts} opts
+	/**
+	 * @param {T} new_value
+	 * @param {import('./private.js').SpringUpdateOpts} opts
 	 * @returns {Promise<void>}
 	 */
 	function set(new_value, opts = {}) {
@@ -115,7 +118,7 @@ export function spring(value, opts = {}) {
 			});
 		});
 	}
-	/** @type {Spring<T>} */
+	/** @type {import('./public.js').Spring<T>} */
 	const spring = {
 		set,
 		update: (fn, opts) => set(fn(target_value, value), opts),
@@ -126,38 +129,3 @@ export function spring(value, opts = {}) {
 	};
 	return spring;
 }
-
-/**
- * @typedef {(target_value: T, value: T) => T} Updater
- * @template T
- */
-
-/**
- * @typedef {Object} TickContext
- * @property {number} inv_mass
- * @property {number} dt
- * @property {Spring<T>} opts
- * @property {boolean} settled
- */
-
-/**
- * @typedef {Object} SpringOpts
- * @property {number} [stiffness]
- * @property {number} [damping]
- * @property {number} [precision]
- */
-
-/**
- * @typedef {Object} SpringUpdateOpts
- * @property {any} [hard]
- * @property {string|number|boolean} [soft]
- */
-
-/**
- * @typedef {Object} Spring
- * @property {(new_value:T,opts?:SpringUpdateOpts)=>Promise<void>} set
- * @property {(fn:Updater<T>,opts?:SpringUpdateOpts)=>Promise<void>} update
- * @property {number} precision
- * @property {number} damping
- * @property {number} stiffness
- */
diff --git a/src/runtime/motion/tweened.js b/src/runtime/motion/tweened.js
index 454d4f40e5..30ecdddb07 100644
--- a/src/runtime/motion/tweened.js
+++ b/src/runtime/motion/tweened.js
@@ -45,18 +45,19 @@ function get_interpolator(a, b) {
 }
 
 /**
+ * @template T
  * @param {T} value
- * @param {Options<T>} defaults
- * @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/tweened.ts-to-jsdoc").Tweened<T>}
+ * @param {import('./private.js').TweenedOptions<T>} defaults
+ * @returns {import('./public.js').Tweened<T>}
  */
 export function tweened(value, defaults = {}) {
 	const store = writable(value);
-	/** @type {Task} */
+	/** @type {import('../internal/private.js').Task} */
 	let task;
 	let target_value = value;
 	/**
 	 * @param {T} new_value
-	 * @param {Options<T>} opts
+	 * @param {import('./private.js').TweenedOptions<T>} opts
 	 * @returns {any}
 	 */
 	function set(new_value, opts) {
@@ -95,7 +96,7 @@ export function tweened(value, defaults = {}) {
 				previous_task = null;
 			}
 			const elapsed = now - start;
-			if (elapsed > duration) {
+			if (elapsed > /** @type {number} */ (duration)) {
 				store.set((value = new_value));
 				return false;
 			}
@@ -111,17 +112,3 @@ export function tweened(value, defaults = {}) {
 		subscribe: store.subscribe
 	};
 }
-
-/**
- * @typedef {(target_value: T, value: T) => T} Updater
- * @template T
- */
-
-/**
- * @typedef {Object} Options
- * @property {number} [delay]
- * @property {number|((from:T,to:T)=>number)} [duration]
- * @property {(t:number)=>number} [easing]
- * @property {(a:T,b:T)=>(t:number)=>T} [interpolate]
- */
-/** @typedef {Object} Tweened */
diff --git a/src/runtime/store/index.js b/src/runtime/store/index.js
index ec8ec9eedc..158f0a6f22 100644
--- a/src/runtime/store/index.js
+++ b/src/runtime/store/index.js
@@ -11,9 +11,10 @@ const subscriber_queue = [];
 
 /**
  * Creates a `Readable` store that allows reading by subscription.
- * @param {T} value  initial value
- * @param {StartStopNotifier<T>} start  undefined
- * @returns {Readable<T>}
+ * @template T
+ * @param {T} value initial value
+ * @param {import('./public.js').StartStopNotifier<T>} start
+ * @returns {import('./public.js').Readable<T>}
  */
 export function readable(value, start) {
 	return {
@@ -23,14 +24,15 @@ export function readable(value, start) {
 
 /**
  * Create a `Writable` store that allows both updating and reading by subscription.
- * @param {T} value  initial value
- * @param {StartStopNotifier<T>} start  undefined
- * @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").Writable<T>}
+ * @template T
+ * @param {T} value initial value
+ * @param {import('./public.js').StartStopNotifier<T>} start
+ * @returns {import('./public.js').Writable<T>}
  */
 export function writable(value, start = noop) {
-	/** @type {Unsubscriber} */
+	/** @type {import('./public.js').Unsubscriber} */
 	let stop;
-	/** @type {Set<SubscribeInvalidateTuple<T>>} */
+	/** @type {Set<import('./public.js').SubscribeInvalidateTuple<T>>} */
 	const subscribers = new Set();
 	/** @param {T} new_value
 	 * @returns {void}
@@ -55,19 +57,19 @@ export function writable(value, start = noop) {
 		}
 	}
 	/**
-	 * @param {Updater<T>} fn
+	 * @param {import('./public.js').Updater<T>} fn
 	 * @returns {void}
 	 */
 	function update(fn) {
 		set(fn(value));
 	}
 	/**
-	 * @param {Subscriber<T>} run
-	 * @param {Invalidator<T>} invalidate
-	 * @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").Unsubscriber}
+	 * @param {import('./public.js').Subscriber<T>} run
+	 * @param {import('./public.js').Invalidator<T>} invalidate
+	 * @returns {import('./public.js').Unsubscriber}
 	 */
 	function subscribe(run, invalidate = noop) {
-		/** @type {SubscribeInvalidateTuple<T>} */
+		/** @type {import('./public.js').SubscribeInvalidateTuple<T>} */
 		const subscriber = [run, invalidate];
 		subscribers.add(subscriber);
 		if (subscribers.size === 1) {
@@ -86,14 +88,42 @@ export function writable(value, start = noop) {
 }
 
 /**
- * @param {Stores} stores
+ * Derived value store by synchronizing one or more readable stores and
+ * applying an aggregation function over its input values.
+ *
+ * @template {import('./public.js').Stores} S
+ * @template T
+ * @overload
+ * @param {S} stores - input stores
+ * @param {(values: import('./public.js').StoresValues<S>, set: import('./public.js').Subscriber<T>, update: (fn: import('./public.js').Updater<T>) => void) => import('./public.js').Unsubscriber | void} fn - function callback that aggregates the values
+ * @param {T} [initial_value] - initial value
+ * @returns {import('./public.js').Readable<T>}
+ */
+
+/**
+ * Derived value store by synchronizing one or more readable stores and
+ * applying an aggregation function over its input values.
+ *
+ * @template {import('./public.js').Stores} S
+ * @template T
+ * @overload
+ * @param {S} stores - input stores
+ * @param {(values: import('./public.js').StoresValues<S>) => T} fn - function callback that aggregates the values
+ * @param {T} [initial_value] - initial value
+ * @returns {import('./public.js').Readable<T>}
+ */
+
+/**
+ * @template {import('./public.js').Stores} S
+ * @template T
+ * @param {S} stores
  * @param {Function} fn
- * @param {T} initial_value
- * @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").Readable<T>}
+ * @param {T} [initial_value]
+ * @returns {import('./public.js').Readable<T>}
  */
 export function derived(stores, fn, initial_value) {
 	const single = !Array.isArray(stores);
-	/** @type {Array<Readable<any>>} */
+	/** @type {Array<import('./public.js').Readable<any>>} */
 	const stores_array = single ? [stores] : stores;
 	if (!stores_array.every(Boolean)) {
 		throw new Error('derived() expects stores as input, got a falsy value');
@@ -147,8 +177,9 @@ export function derived(stores, fn, initial_value) {
 /**
  * Takes a store and returns a new one derived from the old one that is readable.
  *
- * @param {Readable<T>} store  - store to make readonly
- * @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").Readable<T>}
+ * @template T
+ * @param {import('./public.js').Readable<T>} store  - store to make readonly
+ * @returns {import('./public.js').Readable<T>}
  */
 export function readonly(store) {
 	return {
@@ -158,55 +189,8 @@ export function readonly(store) {
 
 /**
  * Get the current value from a store by subscribing and immediately unsubscribing.
- * @param store readable
- */
-export { get_store_value as get };
-
-/**
- * @typedef {(value: T) => void} Subscriber
  * @template T
+ * @param {import('./public.js').Readable<T>} store readable
+ * @returns {T}
  */
-
-/** @typedef {() => void} Unsubscriber */
-
-/**
- * @typedef {(value: T) => T} Updater
- * @template T
- */
-
-/**
- * @typedef {(value?: T) => void} Invalidator
- * @template T
- */
-
-/**
- * @typedef {(
- * 	set: (value: T) => void,
- * 	update: (fn: Updater<T>) => void
- * ) => void | (() => void)} StartStopNotifier
- * @template T
- */
-
-/**
- * @typedef {[Subscriber<T>, Invalidator<T>]} SubscribeInvalidateTuple
- * @template T
- */
-
-/** @typedef {Readable<any> | [Readable<any>, ...Array<Readable<any>>] | Array<Readable<any>>} Stores */
-
-/**
- * @typedef {T extends Readable<infer U>
- * 	? U
- * 	: { [K in keyof T]: T[K] extends Readable<infer U> ? U : never }} StoresValues
- * @template T
- */
-
-/**
- * Readable interface for subscribing.
- * @typedef {Object} Readable
- */
-
-/**
- * Writable interface for both updating and subscribing.
- * @typedef {Object} Writable
- */
+export { get_store_value as get };
diff --git a/src/runtime/store/public.d.ts b/src/runtime/store/public.d.ts
new file mode 100644
index 0000000000..e35cc3ec83
--- /dev/null
+++ b/src/runtime/store/public.d.ts
@@ -0,0 +1,61 @@
+/** Callback to inform of a value updates. */
+export type Subscriber<T> = (value: T) => void;
+
+/** Unsubscribes from value updates. */
+export type Unsubscriber = () => void;
+
+/** Callback to update a value. */
+export type Updater<T> = (value: T) => T;
+
+/** Cleanup logic callback. */
+type Invalidator<T> = (value?: T) => void;
+
+/**
+ * Start and stop notification callbacks.
+ * This function is called when the first subscriber subscribes.
+ *
+ * @param {(value: T) => void} set Function that sets the value of the store.
+ * @param {(value: Updater<T>) => void} set Function that sets the value of the store after passing the current value to the update function.
+ * @returns {void | (() => void)} Optionally, a cleanup function that is called when the last remaining
+ * subscriber unsubscribes.
+ */
+export type StartStopNotifier<T> = (
+	set: (value: T) => void,
+	update: (fn: Updater<T>) => void
+) => void | (() => void);
+
+/** Readable interface for subscribing. */
+export interface Readable<T> {
+	/**
+	 * Subscribe on value changes.
+	 * @param run subscription callback
+	 * @param invalidate cleanup callback
+	 */
+	subscribe(this: void, run: Subscriber<T>, invalidate?: Invalidator<T>): Unsubscriber;
+}
+
+/** Writable interface for both updating and subscribing. */
+export interface Writable<T> extends Readable<T> {
+	/**
+	 * Set value and inform subscribers.
+	 * @param value to set
+	 */
+	set(this: void, value: T): void;
+
+	/**
+	 * Update value using callback and inform subscribers.
+	 * @param updater callback
+	 */
+	update(this: void, updater: Updater<T>): void;
+}
+
+/** Pair of subscriber and invalidator. */
+type SubscribeInvalidateTuple<T> = [Subscriber<T>, Invalidator<T>];
+
+/** One or more `Readable`s. */
+type Stores = Readable<any> | [Readable<any>, ...Array<Readable<any>>] | Array<Readable<any>>;
+
+/** One or more values from `Readable` stores. */
+type StoresValues<T> = T extends Readable<infer U>
+	? U
+	: { [K in keyof T]: T[K] extends Readable<infer U> ? U : never };
diff --git a/src/runtime/transition/index.js b/src/runtime/transition/index.js
index 04dfc4d848..3b7bc9c0fc 100644
--- a/src/runtime/transition/index.js
+++ b/src/runtime/transition/index.js
@@ -3,8 +3,8 @@ import { assign, split_css_unit, is_function } from '../internal';
 
 /**
  * @param {Element} node
- * @param {BlurParams}
- * @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").TransitionConfig}
+ * @param {import('./public').BlurParams} [params]
+ * @returns {import('./public').TransitionConfig}
  */
 export function blur(
 	node,
@@ -25,8 +25,8 @@ export function blur(
 
 /**
  * @param {Element} node
- * @param {FadeParams}
- * @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").TransitionConfig}
+ * @param {import('./public').FadeParams} [params]
+ * @returns {import('./public').TransitionConfig}
  */
 export function fade(node, { delay = 0, duration = 400, easing = linear } = {}) {
 	const o = +getComputedStyle(node).opacity;
@@ -40,8 +40,8 @@ export function fade(node, { delay = 0, duration = 400, easing = linear } = {})
 
 /**
  * @param {Element} node
- * @param {FlyParams}
- * @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").TransitionConfig}
+ * @param {import('./public').FlyParams} [params]
+ * @returns {import('./public').TransitionConfig}
  */
 export function fly(
 	node,
@@ -65,8 +65,8 @@ export function fly(
 
 /**
  * @param {Element} node
- * @param {SlideParams}
- * @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").TransitionConfig}
+ * @param {import('./public').SlideParams} [params]
+ * @returns {import('./public').TransitionConfig}
  */
 export function slide(node, { delay = 0, duration = 400, easing = cubicOut, axis = 'y' } = {}) {
 	const style = getComputedStyle(node);
@@ -106,8 +106,8 @@ export function slide(node, { delay = 0, duration = 400, easing = cubicOut, axis
 
 /**
  * @param {Element} node
- * @param {ScaleParams}
- * @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").TransitionConfig}
+ * @param {import('./public').ScaleParams} [params]
+ * @returns {import('./public').TransitionConfig}
  */
 export function scale(
 	node,
@@ -131,8 +131,8 @@ export function scale(
 
 /**
  * @param {SVGElement & { getTotalLength(): number }} node
- * @param {DrawParams}
- * @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").TransitionConfig}
+ * @param {import('./public').DrawParams} [params]
+ * @returns {import('./public').TransitionConfig}
  */
 export function draw(node, { delay = 0, speed, duration, easing = cubicInOut } = {}) {
 	let len = node.getTotalLength();
@@ -161,21 +161,21 @@ export function draw(node, { delay = 0, speed, duration, easing = cubicInOut } =
 }
 
 /**
- * @param {CrossfadeParams & {
- * 	fallback?: (node: Element, params: CrossfadeParams, intro: boolean) => TransitionConfig;
- * }}
- * @returns {[(node: any, params: import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").CrossfadeParams & { key: any; }) => () => import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").TransitionConfig, (node: any, params: import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").CrossfadeParams & { key: any; }) => () => import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").TransitionConfig]}
+ * @param {import('./public').CrossfadeParams & {
+ * 	fallback?: (node: Element, params: import('./public').CrossfadeParams, intro: boolean) => import('./public').TransitionConfig;
+ * }} params
+ * @returns {[(node: any, params: import('./public').CrossfadeParams & { key: any; }) => () => import('./public').TransitionConfig, (node: any, params: import('./public').CrossfadeParams & { key: any; }) => () => import('./public').TransitionConfig]}
  */
 export function crossfade({ fallback, ...defaults }) {
-	/** @type {ClientRectMap} */
+	/** @type {Map<any, Element>} */
 	const to_receive = new Map();
-	/** @type {ClientRectMap} */
+	/** @type {Map<any, Element>} */
 	const to_send = new Map();
 	/**
 	 * @param {Element} from_node
 	 * @param {Element} node
-	 * @param {CrossfadeParams} params
-	 * @returns {import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").TransitionConfig}
+	 * @param {import('./public').CrossfadeParams} params
+	 * @returns {import('./public').TransitionConfig}
 	 */
 	function crossfade(from_node, node, params) {
 		const {
@@ -208,10 +208,10 @@ export function crossfade({ fallback, ...defaults }) {
 	}
 
 	/**
-	 * @param {ClientRectMap} items
-	 * @param {ClientRectMap} counterparts
+	 * @param {Map<any, Element>} items
+	 * @param {Map<any, Element>} counterparts
 	 * @param {boolean} intro
-	 * @returns {(node: any, params: import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").CrossfadeParams & { key: any; }) => () => import("/Users/elliottjohnson/dev/sveltejs/svelte/index.ts-to-jsdoc").TransitionConfig}
+	 * @returns {(node: any, params: import('./public').CrossfadeParams & { key: any; }) => () => import('./public').TransitionConfig}
 	 */
 	function transition(items, counterparts, intro) {
 		return (node, params) => {
@@ -232,73 +232,3 @@ export function crossfade({ fallback, ...defaults }) {
 	}
 	return [transition(to_send, to_receive, false), transition(to_receive, to_send, true)];
 }
-
-/** @typedef {(t: number) => number} EasingFunction */
-/** @typedef {Map<any, Element>} ClientRectMap */
-
-/**
- * @typedef {Object} TransitionConfig
- * @property {number} [delay]
- * @property {number} [duration]
- * @property {EasingFunction} [easing]
- * @property {(t:number,u:number)=>string} [css]
- * @property {(t:number,u:number)=>void} [tick]
- */
-
-/**
- * @typedef {Object} BlurParams
- * @property {number} [delay]
- * @property {number} [duration]
- * @property {EasingFunction} [easing]
- * @property {number|string} [amount]
- * @property {number} [opacity]
- */
-
-/**
- * @typedef {Object} FadeParams
- * @property {number} [delay]
- * @property {number} [duration]
- * @property {EasingFunction} [easing]
- */
-
-/**
- * @typedef {Object} FlyParams
- * @property {number} [delay]
- * @property {number} [duration]
- * @property {EasingFunction} [easing]
- * @property {number|string} [x]
- * @property {number|string} [y]
- * @property {number} [opacity]
- */
-
-/**
- * @typedef {Object} SlideParams
- * @property {number} [delay]
- * @property {number} [duration]
- * @property {EasingFunction} [easing]
- * @property {'x'|'y'} [axis]
- */
-
-/**
- * @typedef {Object} ScaleParams
- * @property {number} [delay]
- * @property {number} [duration]
- * @property {EasingFunction} [easing]
- * @property {number} [start]
- * @property {number} [opacity]
- */
-
-/**
- * @typedef {Object} DrawParams
- * @property {number} [delay]
- * @property {number} [speed]
- * @property {number|((len:number)=>number)} [duration]
- * @property {EasingFunction} [easing]
- */
-
-/**
- * @typedef {Object} CrossfadeParams
- * @property {number} [delay]
- * @property {number|((len:number)=>number)} [duration]
- * @property {EasingFunction} [easing]
- */
diff --git a/src/runtime/transition/public.d.ts b/src/runtime/transition/public.d.ts
new file mode 100644
index 0000000000..0b158f9c2e
--- /dev/null
+++ b/src/runtime/transition/public.d.ts
@@ -0,0 +1,60 @@
+export type EasingFunction = (t: number) => number;
+
+export interface TransitionConfig {
+	delay?: number;
+	duration?: number;
+	easing?: EasingFunction;
+	css?: (t: number, u: number) => string;
+	tick?: (t: number, u: number) => void;
+}
+
+export interface BlurParams {
+	delay?: number;
+	duration?: number;
+	easing?: EasingFunction;
+	amount?: number | string;
+	opacity?: number;
+}
+
+export interface FadeParams {
+	delay?: number;
+	duration?: number;
+	easing?: EasingFunction;
+}
+
+export interface FlyParams {
+	delay?: number;
+	duration?: number;
+	easing?: EasingFunction;
+	x?: number | string;
+	y?: number | string;
+	opacity?: number;
+}
+
+export interface SlideParams {
+	delay?: number;
+	duration?: number;
+	easing?: EasingFunction;
+	axis?: 'x' | 'y';
+}
+
+export interface ScaleParams {
+	delay?: number;
+	duration?: number;
+	easing?: EasingFunction;
+	start?: number;
+	opacity?: number;
+}
+
+export interface DrawParams {
+	delay?: number;
+	speed?: number;
+	duration?: number | ((len: number) => number);
+	easing?: EasingFunction;
+}
+
+export interface CrossfadeParams {
+	delay?: number;
+	duration?: number | ((len: number) => number);
+	easing?: EasingFunction;
+}
diff --git a/tsconfig.json b/tsconfig.json
index 16d4a70709..07813fb1fd 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -15,6 +15,9 @@
 		"noEmitOnError": true,
 		"noErrorTruncation": true,
 
+		"allowJs": true,
+		"checkJs": true,
+
 		// rollup takes care of these
 		"module": "esnext",
 		"moduleResolution": "node",