diff --git a/src/compiler/compile/render-dom/index.ts b/src/compiler/compile/render-dom/index.ts
index 46aa705bfb..a9941b838f 100644
--- a/src/compiler/compile/render-dom/index.ts
+++ b/src/compiler/compile/render-dom/index.ts
@@ -57,7 +57,7 @@ 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 +106,7 @@ 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 +122,14 @@ 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 +145,7 @@ 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 +402,7 @@ 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}'\`);
 				});
 			`;
diff --git a/src/compiler/compile/render-dom/wrappers/AwaitBlock.ts b/src/compiler/compile/render-dom/wrappers/AwaitBlock.ts
index c7af29a073..73ca3fe4f5 100644
--- a/src/compiler/compile/render-dom/wrappers/AwaitBlock.ts
+++ b/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');
 		});
 	}
-}
\ No newline at end of file
+}
diff --git a/src/compiler/compile/render-dom/wrappers/EachBlock.ts b/src/compiler/compile/render-dom/wrappers/EachBlock.ts
index a1a875a12f..dddf415557 100644
--- a/src/compiler/compile/render-dom/wrappers/EachBlock.ts
+++ b/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;
diff --git a/src/compiler/compile/render-ssr/handlers/InlineComponent.ts b/src/compiler/compile/render-ssr/handlers/InlineComponent.ts
index 94fdcfd434..2f407df523 100644
--- a/src/compiler/compile/render-ssr/handlers/InlineComponent.ts
+++ b/src/compiler/compile/render-ssr/handlers/InlineComponent.ts
@@ -52,7 +52,7 @@ export default function(node: InlineComponent, renderer: Renderer, options: Rend
 	let props;
 
 	if (uses_spread) {
-		props = `Object.assign(${
+		props = `@Object.assign(${
 			node.attributes
 				.map(attribute => {
 					if (attribute.is_spread) {
diff --git a/src/runtime/internal/globals.ts b/src/runtime/internal/globals.ts
new file mode 100644
index 0000000000..91a8e4a16d
--- /dev/null
+++ b/src/runtime/internal/globals.ts
@@ -0,0 +1,5 @@
+import { is_client } from './utils';
+
+const { console, Error, Map, Object } = (is_client ? window : global) as { console, Error, Map, Object };
+
+export { console, Error, Map, Object };
diff --git a/src/runtime/internal/index.ts b/src/runtime/internal/index.ts
index 6487f04525..b5ef3e398e 100644
--- a/src/runtime/internal/index.ts
+++ b/src/runtime/internal/index.ts
@@ -1,6 +1,7 @@
 export * from './animations';
 export * from './await-block';
 export * from './dom';
+export * from './globals';
 export * from './keyed-each';
 export * from './lifecycle';
 export * from './loop';
diff --git a/src/runtime/internal/utils.ts b/src/runtime/internal/utils.ts
index 152c0e79b0..5766ac26a5 100644
--- a/src/runtime/internal/utils.ts
+++ b/src/runtime/internal/utils.ts
@@ -90,7 +90,7 @@ export function once(fn) {
 	}
 }
 
-const is_client = typeof window !== 'undefined';
+export const is_client = typeof window !== 'undefined';
 
 export let now: () => number = is_client
 	? () => window.performance.now()
diff --git a/test/js/samples/debug-empty/expected.js b/test/js/samples/debug-empty/expected.js
index 6f07993590..2e4f9feb13 100644
--- a/test/js/samples/debug-empty/expected.js
+++ b/test/js/samples/debug-empty/expected.js
@@ -1,8 +1,11 @@
 /* generated by Svelte vX.Y.Z */
 import {
+	Error,
+	Object,
 	SvelteComponentDev,
 	add_location,
 	append,
+	console,
 	detach,
 	element,
 	init,
diff --git a/test/js/samples/debug-foo-bar-baz-things/expected.js b/test/js/samples/debug-foo-bar-baz-things/expected.js
index eea35d5ba7..c083ea29c3 100644
--- a/test/js/samples/debug-foo-bar-baz-things/expected.js
+++ b/test/js/samples/debug-foo-bar-baz-things/expected.js
@@ -1,8 +1,11 @@
 /* generated by Svelte vX.Y.Z */
 import {
+	Error,
+	Object,
 	SvelteComponentDev,
 	add_location,
 	append,
+	console,
 	destroy_each,
 	detach,
 	element,
diff --git a/test/js/samples/debug-foo/expected.js b/test/js/samples/debug-foo/expected.js
index 5b931d9464..46096466c1 100644
--- a/test/js/samples/debug-foo/expected.js
+++ b/test/js/samples/debug-foo/expected.js
@@ -1,8 +1,11 @@
 /* generated by Svelte vX.Y.Z */
 import {
+	Error,
+	Object,
 	SvelteComponentDev,
 	add_location,
 	append,
+	console,
 	destroy_each,
 	detach,
 	element,
diff --git a/test/js/samples/debug-hoisted/expected.js b/test/js/samples/debug-hoisted/expected.js
index 51d8bf63a3..7f1b7535f3 100644
--- a/test/js/samples/debug-hoisted/expected.js
+++ b/test/js/samples/debug-hoisted/expected.js
@@ -1,5 +1,6 @@
 /* generated by Svelte vX.Y.Z */
 import {
+	Error,
 	SvelteComponentDev,
 	init,
 	noop,
diff --git a/test/js/samples/deconflict-builtins/expected.js b/test/js/samples/deconflict-builtins/expected.js
index 3294778aa3..85f3c31597 100644
--- a/test/js/samples/deconflict-builtins/expected.js
+++ b/test/js/samples/deconflict-builtins/expected.js
@@ -1,5 +1,6 @@
 /* generated by Svelte vX.Y.Z */
 import {
+	Object,
 	SvelteComponent,
 	append,
 	destroy_each,
diff --git a/test/js/samples/dev-warning-missing-data-computed/expected.js b/test/js/samples/dev-warning-missing-data-computed/expected.js
index 5c4b2ece1b..d61f8f3de3 100644
--- a/test/js/samples/dev-warning-missing-data-computed/expected.js
+++ b/test/js/samples/dev-warning-missing-data-computed/expected.js
@@ -1,8 +1,11 @@
 /* generated by Svelte vX.Y.Z */
 import {
+	Error,
+	Object,
 	SvelteComponentDev,
 	add_location,
 	append,
+	console,
 	detach,
 	element,
 	init,
diff --git a/test/js/samples/each-block-array-literal/expected.js b/test/js/samples/each-block-array-literal/expected.js
index 455cb2f25f..934c5cfe92 100644
--- a/test/js/samples/each-block-array-literal/expected.js
+++ b/test/js/samples/each-block-array-literal/expected.js
@@ -1,5 +1,6 @@
 /* generated by Svelte vX.Y.Z */
 import {
+	Object,
 	SvelteComponent,
 	append,
 	destroy_each,
diff --git a/test/js/samples/each-block-changed-check/expected.js b/test/js/samples/each-block-changed-check/expected.js
index 951565bae4..4ed8756b9a 100644
--- a/test/js/samples/each-block-changed-check/expected.js
+++ b/test/js/samples/each-block-changed-check/expected.js
@@ -1,5 +1,6 @@
 /* generated by Svelte vX.Y.Z */
 import {
+	Object,
 	SvelteComponent,
 	append,
 	destroy_each,
diff --git a/test/js/samples/each-block-keyed-animated/expected.js b/test/js/samples/each-block-keyed-animated/expected.js
index ec28e60d5f..9e777f25ee 100644
--- a/test/js/samples/each-block-keyed-animated/expected.js
+++ b/test/js/samples/each-block-keyed-animated/expected.js
@@ -1,5 +1,7 @@
 /* generated by Svelte vX.Y.Z */
 import {
+	Map,
+	Object,
 	SvelteComponent,
 	append,
 	create_animation,
diff --git a/test/js/samples/each-block-keyed/expected.js b/test/js/samples/each-block-keyed/expected.js
index efb58ebf6a..7ac66a09a7 100644
--- a/test/js/samples/each-block-keyed/expected.js
+++ b/test/js/samples/each-block-keyed/expected.js
@@ -1,5 +1,7 @@
 /* generated by Svelte vX.Y.Z */
 import {
+	Map,
+	Object,
 	SvelteComponent,
 	append,
 	destroy_block,
diff --git a/test/runtime/index.js b/test/runtime/index.js
index 77879edc1f..900f3087fc 100644
--- a/test/runtime/index.js
+++ b/test/runtime/index.js
@@ -125,6 +125,7 @@ describe("runtime", () => {
 
 					// Put things we need on window for testing
 					window.SvelteComponent = SvelteComponent;
+					window.Error = global.Error;
 
 					const target = window.document.querySelector("main");