handle arbitrary slot names

Author: Rich-Harris

src/compile/render-dom/index.ts

@@ -10,7 +10,7 @@ import add_to_set from '../utils/add_to_set';
 import get_object from '../utils/get_object';
 import { extract_names } from '../utils/scope';
 import { nodes_match } from '../../utils/nodes_match';
-import { sanitize } from '../../utils/names';
+import { sanitize, quote_prop_if_necessary, quote_name_if_necessary } from '../../utils/names';
 
 export default function dom(
 	component: Component,
@@ -305,8 +305,7 @@ export default function dom(
 	const reactive_stores = component.vars.filter(variable => variable.name[0] === '$' && variable.name[1] !== '$');
 
 	if (renderer.slots.size > 0) {
-		const arr = Array.from(renderer.slots);
-		filtered_declarations.push(...arr.map(name => `$$slot_${sanitize(name)}`), '$$scope');
+		filtered_declarations.push('$$slots', '$$scope');
 	}
 
 	if (renderer.binding_groups.length > 0) {
@@ -399,7 +398,7 @@ export default function dom(
 
 				${component.javascript}
 
-				${renderer.slots.size && `let { ${[...renderer.slots].map(name => `$$slot_${sanitize(name)}`).join(', ')}, $$scope } = $$props;`}
+				${renderer.slots.size && `let { $$slots = {}, $$scope } = $$props;`}
 
 				${renderer.binding_groups.length > 0 && `const $$binding_groups = [${renderer.binding_groups.map(_ => `[]`).join(', ')}];`}
 

src/compile/render-dom/wrappers/InlineComponent/index.ts

@@ -119,16 +119,19 @@ export default class InlineComponentWrapper extends Wrapper {
 
 		const uses_spread = !!this.node.attributes.find(a => a.is_spread);
 
-		const slot_props = Array.from(this.slots).map(([name, slot]) => `$$slot_${sanitize(name)}: [${slot.block.name}${slot.fn ? `, ${slot.fn}` : ''}]`);
-		if (slot_props.length > 0) slot_props.push(`$$scope: { ctx }`);
+		const slot_props = Array.from(this.slots).map(([name, slot]) => `${quote_name_if_necessary(name)}: [${slot.block.name}${slot.fn ? `, ${slot.fn}` : ''}]`);
+
+		const initial_props = slot_props.length > 0
+			? [`$$slots: ${stringify_props(slot_props)}`, `$$scope: { ctx }`]
+			: [];
 
 		const attribute_object = uses_spread
-			? stringify_props(slot_props)
+			? stringify_props(initial_props)
 			: stringify_props(
-				this.node.attributes.map(attr => `${quote_name_if_necessary(attr.name)}: ${attr.get_value(block)}`).concat(slot_props)
+				this.node.attributes.map(attr => `${quote_name_if_necessary(attr.name)}: ${attr.get_value(block)}`).concat(initial_props)
 			);
 
-		if (this.node.attributes.length || this.node.bindings.length || slot_props.length) {
+		if (this.node.attributes.length || this.node.bindings.length || initial_props.length) {
 			if (!uses_spread && this.node.bindings.length === 0) {
 				component_opts.push(`props: ${attribute_object}`);
 			} else {

src/compile/render-dom/wrappers/Slot.ts

@@ -4,7 +4,7 @@ import Block from '../Block';
 import Slot from '../../nodes/Slot';
 import FragmentWrapper from './Fragment';
 import deindent from '../../utils/deindent';
-import { sanitize } from '../../../utils/names';
+import { sanitize, quote_prop_if_necessary } from '../../../utils/names';
 import add_to_set from '../../utils/add_to_set';
 import get_slot_data from '../../utils/get_slot_data';
 import { stringify_props } from '../../utils/stringify_props';
@@ -99,7 +99,7 @@ export default class SlotWrapper extends Wrapper {
 		const slot_definition = block.get_unique_name(`${sanitize(slot_name)}_slot`);
 
 		block.builders.init.add_block(deindent`
-			const ${slot_definition} = ctx.$$slot_${sanitize(slot_name)};
+			const ${slot_definition} = ctx.$$slots${quote_prop_if_necessary(slot_name)};
 			const ${slot} = @create_slot(${slot_definition}, ctx, ${get_slot_context});
 		`);