Import globals from internals

src/compiler/compile/Component.ts

@@ -101,7 +101,8 @@ export default class Component {
 	reactive_declaration_nodes: Set<Node> = new Set();
 	has_reactive_assignments = false;
 	injected_reactive_declaration_vars: Set<string> = new Set();
-	helpers: Set<string> = new Set();
+	helpers: Map<string, string> = new Map();
+	globals: Map<string, string> = new Map();
 
 	indirect_dependencies: Map<string, Set<string>> = new Map();
 
@@ -233,8 +234,15 @@ export default class Component {
 	}
 
 	helper(name: string) {
-		this.helpers.add(name);
-		return this.alias(name);
+		const alias = this.alias(name)
+		this.helpers.set(name, alias);
+		return alias;
+	}
+
+	global(name: string) {
+		const alias = this.alias(name);
+		this.globals.set(name, alias);
+		return alias;
 	}
 
 	generate(result: string) {
@@ -251,23 +259,29 @@ export default class Component {
 				.replace(/__svelte:self__/g, this.name)
 				.replace(compile_options.generate === 'ssr' ? /(@+|#+)(\w*(?:-\w*)?)/g : /(@+)(\w*(?:-\w*)?)/g, (_match: string, sigil: string, name: string) => {
 					if (sigil === '@') {
-						if (internal_exports.has(name)) {
-							if (compile_options.dev && internal_exports.has(`${name}Dev`)) name = `${name}Dev`;
-							this.helpers.add(name);
+						if (name[0] === '_') {
+							return this.global(name.slice(1));
+						}
+
+						if (!internal_exports.has(name)) {
+							throw new Error(`compiler error: this shouldn't happen! generated code is trying to use inexistent internal '${name}'`);
+						}
+
+						if (compile_options.dev && internal_exports.has(`${name}Dev`)) {
+							name = `${name}Dev`;
 						}
 
-						return this.alias(name);
+						return this.helper(name);
 					}
 
 					return sigil.slice(1) + name;
 				});
 
-			const imported_helpers = Array.from(this.helpers)
-				.sort()
-				.map(name => {
-					const alias = this.alias(name);
-					return { name, alias };
-				});
+			const referenced_globals = Array.from(this.globals, ([name, alias]) => name !== alias && ({ name, alias })).filter(Boolean);
+			if (referenced_globals.length) {
+				this.helper('globals');
+			}
+			const imported_helpers = Array.from(this.helpers, ([name, alias]) => ({ name, alias }));
 
 			const module = create_module(
 				result,
@@ -276,6 +290,7 @@ export default class Component {
 				banner,
 				compile_options.sveltePath,
 				imported_helpers,
+				referenced_globals,
 				this.imports,
 				this.vars.filter(variable => variable.module && variable.export_name).map(variable => ({
 					name: variable.name,

src/compiler/compile/create_module.ts

@@ -17,17 +17,18 @@ export default function create_module(
 	banner: string,
 	sveltePath = 'svelte',
 	helpers: Array<{ name: string; alias: string }>,
+	globals: Array<{ name: string; alias: string }>,
 	imports: Node[],
 	module_exports: Export[],
 	source: string
 ): string {
 	const internal_path = `${sveltePath}/internal`;
 
 	if (format === 'esm') {
-		return esm(code, name, banner, sveltePath, internal_path, helpers, imports, module_exports, source);
+		return esm(code, name, banner, sveltePath, internal_path, helpers, globals, imports, module_exports, source);
 	}
 
-	if (format === 'cjs') return cjs(code, name, banner, sveltePath, internal_path, helpers, imports, module_exports);
+	if (format === 'cjs') return cjs(code, name, banner, sveltePath, internal_path, helpers, globals, imports, module_exports);
 
 	throw new Error(`options.format is invalid (must be ${list(Object.keys(wrappers))})`);
 }
@@ -45,13 +46,17 @@ function esm(
 	sveltePath: string,
 	internal_path: string,
 	helpers: Array<{ name: string; alias: string }>,
+	globals: Array<{ name: string; alias: string }>,
 	imports: Node[],
 	module_exports: Export[],
 	source: string
 ) {
 	const internal_imports = helpers.length > 0 && (
 		`import ${stringify_props(helpers.map(h => h.name === h.alias ? h.name : `${h.name} as ${h.alias}`).sort())} from ${JSON.stringify(internal_path)};`
 	);
+	const internal_globals = globals.length > 0 && (
+		`const ${stringify_props(globals.map(g => `${g.name}: ${g.alias}`).sort())} = ${helpers.find(({ name }) => name === 'globals').alias};`
+	);
 
 	const user_imports = imports.length > 0 && (
 		imports
@@ -70,6 +75,7 @@ function esm(
 	return deindent`
 		${banner}
 		${internal_imports}
+		${internal_globals}
 		${user_imports}
 
 		${code}
@@ -85,6 +91,7 @@ function cjs(
 	sveltePath: string,
 	internal_path: string,
 	helpers: Array<{ name: string; alias: string }>,
+	globals: Array<{ name: string; alias: string }>,
 	imports: Node[],
 	module_exports: Export[]
 ) {
@@ -93,6 +100,9 @@ function cjs(
 	const internal_imports = helpers.length > 0 && (
 		`const ${stringify_props(declarations)} = require(${JSON.stringify(internal_path)});\n`
 	);
+	const internal_globals = globals.length > 0 && (
+		`const ${stringify_props(globals.map(g => `${g.name}: ${g.alias}`).sort())} = ${helpers.find(({ name }) => name === 'globals').alias};`
+	);
 
 	const requires = imports.map(node => {
 		let lhs;
@@ -127,6 +137,7 @@ function cjs(
 		"use strict";
 
 		${internal_imports}
+		${internal_globals}
 		${requires}
 
 		${code}

src/compiler/compile/render-dom/Block.ts

@@ -164,7 +164,7 @@ export default class Block {
 
 		if (parent_node) {
 			this.builders.mount.add_line(`@append(${parent_node}, ${name});`);
-			if (parent_node === 'document.head' && !no_detach) this.builders.destroy.add_line(`@detach(${name});`);
+			if (parent_node === '@_document.head' && !no_detach) this.builders.destroy.add_line(`@detach(${name});`);
 		} else {
 			this.builders.mount.add_line(`@insert(#target, ${name}, anchor);`);
 			if (!no_detach) this.builders.destroy.add_conditional('detaching', `@detach(${name});`);

src/compiler/compile/render-dom/index.ts

@@ -36,13 +36,15 @@ export default function dom(
 		`${css.code}\n/*# sourceMappingURL=${css.map.toUrl()} */` :
 		css.code, { only_escape_at_symbol: true });
 
+	const add_css = component.get_unique_name('add_css');
+
 	if (styles && component.compile_options.css !== false && !options.customElement) {
 		builder.add_block(deindent`
-			function @add_css() {
+			function ${add_css}() {
 				var style = @element("style");
 				style.id = '${component.stylesheet.id}-style';
 				style.textContent = ${styles};
-				@append(document.head, style);
+				@append(@_document.head, style);
 			}
 		`);
 	}
@@ -57,7 +59,7 @@ export default function dom(
 
 	if (options.dev && !options.hydratable) {
 		block.builders.claim.add_line(
-			'throw new Error("options.hydrate only works if the component was compiled with the `hydratable: true` option");'
+			'throw new @_Error("options.hydrate only works if the component was compiled with the `hydratable: true` option");'
 		);
 	}
 
@@ -106,7 +108,7 @@ export default function dom(
 		} else if (component.compile_options.dev) {
 			body.push(deindent`
 				get ${x.export_name}() {
-					throw new Error("<${component.tag}>: Props cannot be read directly from the component instance unless compiling with 'accessors: true' or '<svelte:options accessors/>'");
+					throw new @_Error("<${component.tag}>: Props cannot be read directly from the component instance unless compiling with 'accessors: true' or '<svelte:options accessors/>'");
 				}
 			`);
 		}
@@ -122,14 +124,14 @@ export default function dom(
 			} else if (component.compile_options.dev) {
 				body.push(deindent`
 					set ${x.export_name}(value) {
-						throw new Error("<${component.tag}>: Cannot set read-only property '${x.export_name}'");
+						throw new @_Error("<${component.tag}>: Cannot set read-only property '${x.export_name}'");
 					}
 				`);
 			}
 		} else if (component.compile_options.dev) {
 			body.push(deindent`
 				set ${x.export_name}(value) {
-					throw new Error("<${component.tag}>: Props cannot be set directly on the component instance unless compiling with 'accessors: true' or '<svelte:options accessors/>'");
+					throw new @_Error("<${component.tag}>: Props cannot be set directly on the component instance unless compiling with 'accessors: true' or '<svelte:options accessors/>'");
 				}
 			`);
 		}
@@ -145,7 +147,7 @@ export default function dom(
 				const props = ${options.customElement ? `this.attributes` : `options.props || {}`};
 				${expected.map(prop => deindent`
 				if (ctx.${prop.name} === undefined && !('${prop.export_name}' in props)) {
-					console.warn("<${component.tag}> was created without expected prop '${prop.export_name}'");
+					@_console.warn("<${component.tag}> was created without expected prop '${prop.export_name}'");
 				}`)}
 			`;
 		}
@@ -402,7 +404,7 @@ export default function dom(
 		if (component.compile_options.dev && !component.var_lookup.has('$$props') && writable_props.length) {
 			unknown_props_check = deindent`
 				const writable_props = [${writable_props.map(prop => `'${prop.export_name}'`).join(', ')}];
-				Object.keys($$props).forEach(key => {
+				@_Object.keys($$props).forEach(key => {
 					if (!writable_props.includes(key) && !key.startsWith('$$')) console.warn(\`<${component.tag}> was created with unknown prop '\${key}'\`);
 				});
 			`;
@@ -481,7 +483,7 @@ export default function dom(
 
 		if (component.tag != null) {
 			builder.add_block(deindent`
-				customElements.define("${component.tag}", ${name});
+				@_customElements.define("${component.tag}", ${name});
 			`);
 		}
 	} else {
@@ -491,7 +493,7 @@ export default function dom(
 			class ${name} extends @${superclass} {
 				constructor(options) {
 					super(${options.dev && `options`});
-					${should_add_css && `if (!document.getElementById("${component.stylesheet.id}-style")) @add_css();`}
+					${should_add_css && `if (!@_document.getElementById("${component.stylesheet.id}-style")) ${add_css}();`}
 					@init(this, options, ${definition}, create_fragment, ${not_equal}, ${prop_names});
 
 					${dev_props_check}

src/compiler/compile/render-dom/wrappers/AwaitBlock.ts

@@ -142,7 +142,7 @@ export default class AwaitBlockWrapper extends Wrapper {
 			this.catch.block.name && `catch: ${this.catch.block.name}`,
 			this.then.block.name && `value: '${this.node.value}'`,
 			this.catch.block.name && `error: '${this.node.error}'`,
-			this.pending.block.has_outro_method && `blocks: Array(3)`
+			this.pending.block.has_outro_method && `blocks: [,,,]`
 		].filter(Boolean);
 
 		block.builders.init.add_block(deindent`
@@ -230,4 +230,4 @@ export default class AwaitBlockWrapper extends Wrapper {
 			branch.fragment.render(branch.block, null, 'nodes');
 		});
 	}
-}
+}

src/compiler/compile/render-dom/wrappers/Body.ts

@@ -11,11 +11,11 @@ export default class BodyWrapper extends Wrapper {
 			const snippet = handler.render(block);
 
 			block.builders.init.add_block(deindent`
-				document.body.addEventListener("${handler.name}", ${snippet});
+				@_document.body.addEventListener("${handler.name}", ${snippet});
 			`);
 
 			block.builders.destroy.add_block(deindent`
-				document.body.removeEventListener("${handler.name}", ${snippet});
+				@_document.body.removeEventListener("${handler.name}", ${snippet});
 			`);
 		});
 	}

src/compiler/compile/render-dom/wrappers/DebugTag.ts

@@ -62,15 +62,15 @@ export default class DebugTagWrapper extends Wrapper {
 			block.builders.update.add_block(deindent`
 				if (${condition}) {
 					const { ${ctx_identifiers} } = ctx;
-					console.${log}({ ${logged_identifiers} });
+					@_console.${log}({ ${logged_identifiers} });
 					debugger;
 				}
 			`);
 
 			block.builders.create.add_block(deindent`
 				{
 					const { ${ctx_identifiers} } = ctx;
-					console.${log}({ ${logged_identifiers} });
+					@_console.${log}({ ${logged_identifiers} });
 					debugger;
 				}
 			`);

src/compiler/compile/render-dom/wrappers/EachBlock.ts

@@ -190,7 +190,7 @@ export default class EachBlockWrapper extends Wrapper {
 
 		renderer.blocks.push(deindent`
 			function ${this.vars.get_each_context}(ctx, list, i) {
-				const child_ctx = Object.create(ctx);
+				const child_ctx = @_Object.create(ctx);
 				${this.context_props}
 				return child_ctx;
 			}
@@ -296,7 +296,7 @@ export default class EachBlockWrapper extends Wrapper {
 		const lookup = block.get_unique_name(`${this.var}_lookup`);
 
 		block.add_variable(iterations, '[]');
-		block.add_variable(lookup, `new Map()`);
+		block.add_variable(lookup, `new @_Map()`);
 
 		if (this.fragment.nodes[0].is_dom_node()) {
 			this.block.first = this.fragment.nodes[0].var;

src/compiler/compile/render-dom/wrappers/Element/Binding.ts

@@ -136,7 +136,7 @@ export default class BindingWrapper {
 			case 'currentTime':
 			case 'playbackRate':
 			case 'volume':
-				update_conditions.push(`!isNaN(${this.snippet})`);
+				update_conditions.push(`!@_isNaN(${this.snippet})`);
 				break;
 
 			case 'paused':

src/compiler/compile/render-dom/wrappers/Element/index.ts

@@ -270,7 +270,7 @@ export default class ElementWrapper extends Wrapper {
 				`@append(${parent_node}, ${node});`
 			);
 
-			if (parent_node === 'document.head') {
+			if (parent_node === '@_document.head') {
 				block.builders.destroy.add_line(`@detach(${node});`);
 			}
 		} else {
@@ -379,7 +379,7 @@ export default class ElementWrapper extends Wrapper {
 		}
 
 		if (namespace) {
-			return `document.createElementNS("${namespace}", "${name}")`;
+			return `@_document.createElementNS("${namespace}", "${name}")`;
 		}
 
 		return `@element("${name}")`;
@@ -465,7 +465,7 @@ export default class ElementWrapper extends Wrapper {
 				block.builders.init.add_block(deindent`
 					function ${handler}() {
 						${animation_frame && deindent`
-						cancelAnimationFrame(${animation_frame});
+						@_cancelAnimationFrame(${animation_frame});
 						if (!${this.var}.paused) ${animation_frame} = @raf(${handler});`}
 						${needs_lock && `${lock} = true;`}
 						ctx.${handler}.call(${this.var}${contextual_dependencies.size > 0 ? ', ctx' : ''});

src/compiler/compile/render-dom/wrappers/Head.ts

@@ -30,6 +30,6 @@ export default class HeadWrapper extends Wrapper {
 	}
 
 	render(block: Block, _parent_node: string, _parent_nodes: string) {
-		this.fragment.render(block, 'document.head', 'nodes');
+		this.fragment.render(block, '@_document.head', 'nodes');
 	}
 }

src/compiler/compile/render-dom/wrappers/IfBlock.ts

@@ -154,7 +154,7 @@ export default class IfBlockWrapper extends Wrapper {
 
 		const vars = { name, anchor, if_name, has_else, has_transitions };
 
-		const detaching = (parent_node && parent_node !== 'document.head') ? '' : 'detaching';
+		const detaching = (parent_node && parent_node !== '@_document.head') ? '' : 'detaching';
 
 		if (this.node.else) {
 			if (has_outros) {

src/compiler/compile/render-dom/wrappers/RawMustacheTag.ts

@@ -22,7 +22,7 @@ export default class RawMustacheTagWrapper extends Tag {
 	render(block: Block, parent_node: string, parent_nodes: string) {
 		const name = this.var;
 
-		const in_head = parent_node === 'document.head';
+		const in_head = parent_node === '@_document.head';
 		const needs_anchors = !parent_node || in_head;
 
 		// if in head always needs anchors

src/compiler/compile/render-dom/wrappers/Title.ts

@@ -68,9 +68,9 @@ export default class TitleWrapper extends Wrapper {
 			const init = this.node.should_cache ? `${last} = ${value}` : value;
 
 			block.builders.init.add_line(
-				`document.title = ${init};`
+				`@_document.title = ${init};`
 			);
-			const updater = `document.title = ${this.node.should_cache ? last : value};`;
+			const updater = `@_document.title = ${this.node.should_cache ? last : value};`;
 
 			if (all_dependencies.size) {
 				const dependencies = Array.from(all_dependencies);
@@ -95,7 +95,7 @@ export default class TitleWrapper extends Wrapper {
 				? stringify((this.node.children[0] as Text).data)
 				: '""';
 
-			block.builders.hydrate.add_line(`document.title = ${value};`);
+			block.builders.hydrate.add_line(`@_document.title = ${value};`);
 		}
 	}
 }