diff --git a/.gitignore b/.gitignore
index 69cfed1477..176a005741 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,7 +8,6 @@ node_modules
 /src/compiler/compile/internal_exports.ts
 
 /animate
-/dev
 /easing
 /environment/
 /internal
diff --git a/rollup.config.js b/rollup.config.js
index ef732cc9d5..0f1678de02 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -13,21 +13,11 @@ const ts_plugin = is_publish
 	? typescript({ include: 'src/**', typescript: require('typescript') })
 	: sucrase({ transforms: ['typescript'] });
 
-// documented in src/ambient.ts
 const globals = (name) =>
-	name === 'compiler'
-		? replace({
-				'var __VERSION__: string': 'var rollup_removes_this',
-				'__VERSION__': `"${pkg.version}"`,
-		  })
-		: replace({
-				'var __DEV__: boolean': 'var rollup_removes_this',
-				'__DEV__': name === 'dev',
-				'var __TEST__: boolean': 'var rollup_removes_this',
-				'__TEST__': name === 'test',
-				'var __VERSION__: string': 'var rollup_removes_this',
-				'__VERSION__': `"${pkg.version}"`,
-		  });
+	replace({
+		'var __VERSION__: string': 'var rollup_removes_this',
+		'__VERSION__': `"${pkg.version}"`,
+	});
 /**
  *
  */
@@ -61,12 +51,6 @@ export default [
 			 * -> 'svelte/index.js'
 			 */
 			default: { file: 'index', path: '.' },
-			/**
-			 * Development main runtime
-			 * -> 'svelte/dev/index.js'
-			 * redirected to by the compiler
-			 */
-			dev: { file: 'index', path: '.' },
 		},
 		plugins: [ts_plugin],
 	}),
@@ -83,12 +67,6 @@ export default [
 					 * -> 'svelte/[library]/index.js'
 					 */
 					[library]: { file: 'index', path: '..' },
-					/**
-					 * Development runtime
-					 * -> 'svelte/dev/[library].js'
-					 * Must be redirected to by user's bundler
-					 */
-					dev: { file: library, path: '.' },
 				},
 				plugins: [
 					ts_plugin,
diff --git a/src/ambient.ts b/src/ambient.ts
index c567d4577d..7853694bda 100644
--- a/src/ambient.ts
+++ b/src/ambient.ts
@@ -1,55 +1 @@
-/**
- *   __DEV__
- *
- * Used in src/runtime
- *
- * Bundles dev runtime to svelte/dev/[library].[m]js
- * the compiler rewrites its own 'svelte' imports to 'svelte/dev' automatically
- *
- */
-declare var __DEV__: boolean;
-/**
- *   __VERSION__
- *
- * Svelte's version in package.json
- * Used in src/compiler and src/runtime
- *
- */
 declare var __VERSION__: string;
-/**
- *   __COMPILER_API_VERSION__
- *
- *  Unique ID passed to the compiler
- *  Used to mitigate breaking changes with bundler plugins
- *
- *  VERSIONS ( default is "3.0.0" )
- *
- *      >3.22.0 : {
- *
- *          The change :
- *              A different runtime is now used in dev mode,
- *              every import has to go through 'svelte/dev' instead of 'svelte'
- *
- *          Requirement :
- *              In dev mode, bundler plugins must make sure that every 'svelte' import is replaced by 'svelte/dev'
- *
- *      }
- *
- */
-//declare var __COMPILER_API_VERSION__: boolean;
-/**
- * Unique ID devtools must pass to the compiler
- * Used to
- *
- * VERSIONS ( default is "^3.21.0" )
- * - 0 (default) : compiler imports from prod runtime
- * - 1 : in dev mode, compiler imports from dev runtime
- */
-//declare var __DEVTOOLS_API_VERSION__: boolean;
-
-/**
- * TODO
- * Bundle different runtime for tests
- * instead of relying on hacks
- */
-declare var __TEST__: boolean;