add slots option to component constructor options object

.eslintrc.js

@@ -7,6 +7,7 @@ module.exports = {
 			'svelte/internal',
 			'svelte/store',
 			'svelte/easing',
+			'svelte/slot',
 			'estree'
 		],
 		'svelte3/compiler': require('./compiler')

.gitignore

@@ -14,6 +14,7 @@ node_modules
 /motion
 /transition
 /animate
+/slot
 /scratch/
 /coverage/
 /coverage.lcov

package.json

@@ -99,7 +99,7 @@
     "@rollup/plugin-json": "^4.0.1",
     "@rollup/plugin-node-resolve": "^6.0.0",
     "@rollup/plugin-replace": "^2.3.0",
-    "@rollup/plugin-sucrase": "^3.0.0",
+    "@rollup/plugin-sucrase": "^3.1.0",
     "@rollup/plugin-typescript": "^2.0.1",
     "@rollup/plugin-virtual": "^2.0.0",
     "@sveltejs/eslint-config": "github:sveltejs/eslint-config#v5.6.0",
@@ -131,7 +131,7 @@
     "sourcemap-codec": "^1.4.8",
     "tiny-glob": "^0.2.6",
     "tslib": "^1.10.0",
-    "typescript": "^3.5.3"
+    "typescript": "^3.9.7"
   },
   "nyc": {
     "include": [

site/content/docs/03-run-time.md

@@ -906,6 +906,7 @@ The following initialisation options can be provided:
 | `props` | `{}` | An object of properties to supply to the component
 | `hydrate` | `false` | See below
 | `intro` | `false` | If `true`, will play transitions on initial render, rather than waiting for subsequent state changes
+| `slots` | `{}` | An object with keys - slot names, values - element or array of elements
 
 Existing children of `target` are left where they are.
 

src/runtime/index.ts

@@ -13,3 +13,5 @@ export {
 	SvelteComponentDev as SvelteComponent,
 	SvelteComponentTyped
 } from 'svelte/internal';
+
+export { createSlot, slot } from 'svelte/slot';

src/runtime/internal/Component.ts

@@ -4,27 +4,30 @@ import { blank_object, is_empty, is_function, run, run_all, noop } from './utils
 import { children, detach } from './dom';
 import { transition_in } from './transitions';
 
-interface Fragment {
-	key: string|null;
-	first: null;
+export interface FragmentMinimal {
 	/* create  */ c: () => void;
 	/* claim   */ l: (nodes: any) => void;
+	/* mount   */ m: (target: HTMLElement, anchor: HTMLElement) => void;
+	/* destroy */ d: (detaching: 0|1) => void;
+
+}
+interface Fragment extends FragmentMinimal {
+	key: string|null;
+	first: null;
 	/* hydrate */ h: () => void;
-	/* mount   */ m: (target: HTMLElement, anchor: any) => void;
 	/* update  */ p: (ctx: any, dirty: any) => 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;
 }
 interface T$$ {
 	dirty: number[];
-	ctx: null|any;
+	ctx?: any;
 	bound: any;
 	update: () => void;
-	callbacks: any;
+	callbacks: Record<string, CallableFunction[]>;
 	after_update: any[];
 	props: Record<string, 0 | string>;
 	fragment: null|false|Fragment;
@@ -36,7 +39,7 @@ interface T$$ {
 	skip_bound: boolean;
 }
 
-export function bind(component, name, callback) {
+export function bind(component: SvelteComponent, name, callback) {
 	const index = component.$$.props[name];
 	if (index !== undefined) {
 		component.$$.bound[index] = callback;
@@ -52,7 +55,7 @@ export function claim_component(block, parent_nodes) {
 	block && block.l(parent_nodes);
 }
 
-export function mount_component(component, target, anchor) {
+export function mount_component(component: SvelteComponent, target, anchor) {
 	const { fragment, on_mount, on_destroy, after_update } = component.$$;
 
 	fragment && fragment.m(target, anchor);
@@ -73,7 +76,7 @@ export function mount_component(component, target, anchor) {
 	after_update.forEach(add_render_callback);
 }
 
-export function destroy_component(component, detaching) {
+export function destroy_component(component: SvelteComponent, detaching) {
 	const $$ = component.$$;
 	if ($$.fragment !== null) {
 		run_all($$.on_destroy);
@@ -87,7 +90,7 @@ export function destroy_component(component, detaching) {
 	}
 }
 
-function make_dirty(component, i) {
+function make_dirty(component: SvelteComponent, i) {
 	if (component.$$.dirty[0] === -1) {
 		dirty_components.push(component);
 		schedule_update();
@@ -96,11 +99,33 @@ function make_dirty(component, i) {
 	component.$$.dirty[(i / 31) | 0] |= (1 << (i % 31));
 }
 
-export function init(component, options, instance, create_fragment, not_equal, props, dirty = [-1]) {
+export type Props = Record<string, any>;
+
+export type SvelteSlotOptions = {
+	props?: Props;
+}
+
+export type SvelteComponentOptions = {
+	target: Element;
+	anchor?: Element;
+	hydrate?: boolean;
+	intro?: boolean;
+	slots?: unknown;
+} & SvelteSlotOptions;
+
+export type SvelteComponentOptionsPrivate = {
+	target?: Element;
+	$$inline?: boolean;
+} & SvelteComponentOptions;
+
+export function init(component: SvelteComponent, options: SvelteComponentOptions, instance, create_fragment, not_equal, props: Props, dirty = [-1]) {
 	const parent_component = current_component;
 	set_current_component(component);
 
 	const prop_values = options.props || {};
+	if (options.slots) {
+		prop_values.$$slots = options.slots;
+	}
 
 	const $$: T$$ = component.$$ = {
 		fragment: null,
@@ -164,9 +189,7 @@ export function init(component, options, instance, create_fragment, not_equal, p
 	set_current_component(parent_component);
 }
 
-export let SvelteElement;
-if (typeof HTMLElement === 'function') {
-	SvelteElement = class extends HTMLElement {
+export class SvelteElement extends HTMLElement {
 		$$: T$$;
 		$$set?: ($$props: any) => void;
 		constructor() {
@@ -209,8 +232,7 @@ if (typeof HTMLElement === 'function') {
 				this.$$.skip_bound = false;
 			}
 		}
-	};
-}
+	}
 
 /**
  * Base class for Svelte components. Used when dev=false.
@@ -224,7 +246,7 @@ export class SvelteComponent {
 		this.$destroy = noop;
 	}
 
-	$on(type, callback) {
+	$on(type: string, callback: CallableFunction) {
 		const callbacks = (this.$$.callbacks[type] || (this.$$.callbacks[type] = []));
 		callbacks.push(callback);
 

src/runtime/internal/dev.ts

@@ -1,5 +1,5 @@
 import { custom_event, append, insert, detach, listen, attr } from './dom';
-import { SvelteComponent } from './Component';
+import { SvelteComponent, Props, SvelteComponentOptions, SvelteComponentOptionsPrivate } from './Component';
 
 export function dispatch_dev<T=any>(type: string, detail?: T) {
 	document.dispatchEvent(custom_event(type, { version: '__VERSION__', ...detail }));
@@ -97,7 +97,6 @@ export function validate_slots(name, slot, keys) {
 	}
 }
 
-type Props = Record<string, any>;
 export interface SvelteComponentDev {
 	$set(props?: Props): void;
 	$on(event: string, callback: (event: any) => void): () => void;
@@ -116,15 +115,9 @@ export class SvelteComponentDev extends SvelteComponent {
 	 */
 	$$prop_def: Props;
 
-	constructor(options: {
-		target: Element;
-		anchor?: Element;
-		props?: Props;
-		hydrate?: boolean;
-		intro?: boolean;
-		$$inline?: boolean;
-    }) {
-		if (!options || (!options.target && !options.$$inline)) {
+	constructor(options: SvelteComponentOptions) {
+		const privateOptions: SvelteComponentOptionsPrivate = options;
+		if (!privateOptions || (!privateOptions.target && !privateOptions.$$inline)) {
 			throw new Error("'target' is a required option");
 		}
 

src/runtime/internal/utils.ts

@@ -79,10 +79,10 @@ export function create_slot(definition, ctx, $$scope, fn) {
 	}
 }
 
-export function get_slot_context(definition, ctx, $$scope, fn) {
+export function get_slot_context(definition, ctx, $$scope: {ctx: unknown[]} | undefined, fn) {
 	return definition[1] && fn
-		? assign($$scope.ctx.slice(), definition[1](fn(ctx)))
-		: $$scope.ctx;
+		? assign($$scope?.ctx.slice(), definition[1](fn(ctx)))
+		: $$scope?.ctx;
 }
 
 export function get_slot_changes(definition, $$scope, dirty, fn) {

src/runtime/slot/index.ts

@@ -0,0 +1,41 @@
+import { noop, insert, detach, FragmentMinimal, SvelteSlotOptions, SvelteComponentOptionsPrivate } from 'svelte/internal';
+import { SvelteComponent } from '..';
+
+function create_root_slot_fn(elements: Node[]) {
+	return function (): FragmentMinimal {
+		return {
+			c: noop,
+
+			m: function mount(target, anchor) {
+				elements.forEach(element => {
+					insert(target, element, anchor);
+				});
+			},
+
+			d: function destroy(detaching) {
+				if (detaching) {
+					elements.forEach(detach);
+				}
+			},
+
+			l: noop
+		};
+	};
+}
+
+export function createSlot(input: Record<string, Node | Node[]>) {
+	const slots: Record<string, Array<ReturnType<typeof create_root_slot_fn>>> = {};
+	for (const key in input) {
+		const nodeOrNodeList = input[key];
+		const nodeList = Array.isArray(nodeOrNodeList) ? nodeOrNodeList : [nodeOrNodeList];
+		slots[key] = [create_root_slot_fn(nodeList)];
+	}
+	return slots;
+}
+
+export function slot(componentClass: typeof SvelteComponent, options: SvelteSlotOptions): Element[] {
+	const wrapper = document.createElement('div');
+	new componentClass({...options, target: wrapper} as SvelteComponentOptionsPrivate) as any;
+	// @TODO this is a workaround until src/compiler/compile/render_dom/Block.ts is extended to expose created HTML element
+	return Array.from(wrapper.children);
+}

test/helpers.ts

@@ -61,6 +61,7 @@ global.navigator = window.navigator;
 global.getComputedStyle = window.getComputedStyle;
 global.requestAnimationFrame = null; // placeholder, filled in using set_raf
 global.window = window;
+global.HTMLElement = window.HTMLElement;
 
 // add missing ecmascript globals to window
 for (const key of Object.getOwnPropertyNames(global)) {