diff --git a/flow/babel.js.flow b/flow/babel.js.flow
deleted file mode 100644
index 5e0f1dea4..000000000
--- a/flow/babel.js.flow
+++ /dev/null
@@ -1,139 +0,0 @@
-/**
- * Copyright (c) 2013-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
- */
-
-type _SourceMap = {
-  file?: string,
-  mappings: string,
-  names: Array<string>,
-  sourceRoot?: string,
-  sources: Array<string>,
-  sourcesContent?: Array<?string>,
-  version: number,
-};
-
-// based on babylon v6.13.1
-type BabylonOptions = {
-  allowImportExportEverywhere?: boolean,
-  allowReturnOutsideFunction?: boolean,
-  allowSuperOutsideMethod?: boolean,
-  sourceType?: 'script' | 'module',
-  sourceFilename?: 'string',
-  plugins?: Array<
-    'jsx' | 'flow' | 'doExpressions' | 'objectRestSpread' | 'decorators' |
-    'classProperties' | 'exportExtensions' | 'asyncGenerators' |
-    'functionBind' | 'functionSent' | 'dynamicImport'
-  >,
-};
-
-// based on babel-generator v6.18.0
-type GeneratorOptions = {
-  auxiliaryCommentBefore?: string,
-  auxiliaryCommentAfter?: string,
-  shouldPrintComment?: (comment: string) => boolean,
-  retainLines?: boolean,
-  retainFunctionParens?: boolean,
-  comments?: boolean,
-  compact?: boolean | 'auto',
-  minified?: boolean,
-  concise?: boolean,
-  quotes?: 'single' | 'double',
-  filename?: string,
-  sourceMaps?: boolean,
-  sourceMapTarget?: string,
-  sourceRoot?: string,
-  sourceFileName?: string,
-};
-
-type InlinePlugin = string | {} | () => {};
-type _Plugins = Array<string | Object | [InlinePlugin] | [InlinePlugin, mixed]>;
-
-// based on https://babeljs.io/docs/usage/options/ -- 2016-11-11
-type __TransformOptions = {
-  filename?: string,
-  filenameRelative?: string,
-  presets?: Array<string | Object>,
-  plugins?: _Plugins,
-  parserOpts?: BabylonOptions,
-  generatorOpts?: GeneratorOptions,
-  highlightCode?: boolean,
-  only?: string | RegExp | Array<string | RegExp>,
-  ignore?: string | RegExp | Array<string | RegExp>,
-  auxiliaryCommentBefore?: boolean,
-  auxiliaryCommentAfter?: boolean,
-  sourceMaps?: boolean,
-  inputSourceMap?: ?Object,
-  sourceMapTarget?: string,
-  sourceFileName?: string,
-  sourceRoot?: string,
-  moduleRoot?: string,
-  moduleIds?: boolean,
-  moduleId?: string,
-  getModuleId?: (moduleName: string) => string,
-  resolveModuleSource?: (source: string, filename: string) => string,
-  code?: boolean,
-  babelrc?: boolean,
-  ast?: boolean,
-  compact?: boolean | 'auto',
-  minified?: boolean,
-  comments?: boolean,
-  shouldPrintComment?: (comment: string) => boolean,
-  retainLines?: boolean,
-  extends?: string,
-};
-
-type _TransformOptions =
-  __TransformOptions & {env?: {[key: string]: __TransformOptions}};
-declare class _Ast {}
-type TransformResult = {
-  ast: _Ast,
-  code: ?string,
-  ignored: boolean,
-  map: ?_SourceMap,
-};
-type VisitFn = <State>(path: Object, state: State) => any;
-
-declare module 'babel-core' {
-  declare type Plugins = _Plugins;
-  declare type SourceMap = _SourceMap;
-  declare type Ast = _Ast;
-  declare type TransformOptions = _TransformOptions;
-  declare function transform(
-    code: string,
-    options?: _TransformOptions,
-  ): TransformResult;
-  declare function traverse<State>(
-    ast: _Ast,
-    visitor: {[key: string]: VisitFn<State> |
-                             {enter?: VisitFn<State>, exit?: VisitFn<State>}},
-    scope?: ?Object,
-    state?: State,
-    parentPath?: ?Object,
-  ): void;
-  declare var types: {[key: string]: Function};
-  declare function transformFromAst(
-    ast: _Ast,
-    code?: ?string,
-    babelOptions?: _TransformOptions,
-  ): TransformResult;
-}
-
-type RawMapping = {
-  generated: {column: number, line: number},
-  name?: string,
-  original?: {column: number, line: number},
-  source?: string,
-};
-
-declare module 'babel-generator' {
-  declare type RawMapping = RawMapping;
-  declare function exports(
-    ast: _Ast,
-    options?: GeneratorOptions,
-  ): TransformResult & {rawMappings: ?Array<RawMapping>};
-}
diff --git a/flow/uglify.js b/flow/uglify.js
deleted file mode 100644
index 29a3e85ac..000000000
--- a/flow/uglify.js
+++ /dev/null
@@ -1,71 +0,0 @@
-/**
- * Copyright (c) 2013-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
- */
-
-'use strict';
-
-type _SourceMap = {
-  file?: string,
-  mappings: string,
-  names: Array<string>,
-  sourceRoot?: string,
-  sources: Array<string>,
-  sourcesContent?: Array<?string>,
-  version: number,
-};
-
-type _Result<MapT> = {
-  code: string,
-  map: MapT,
-};
-
-type _Options = {
-  compress?: false | {||},
-  fromString?: boolean,
-  inSourceMap?: string | ?_SourceMap,
-  mangle?: boolean | {|
-    except?: Array<string>,
-    toplevel?: boolean,
-    eval?: boolean,
-    keep_fnames?: boolean,
-  |},
-  mangleProperties?: boolean | {|
-    regex?: RegExp,
-    ignore_quoted?: boolean,
-    debug?: false | string,
-  |},
-  outFileName?: string,
-  output?: {|
-    ascii_only?: boolean,
-    screw_ie8?: boolean,
-  |},
-  parse?: {|
-    strict?: boolean,
-    bare_returns?: boolean,
-    filename?: string,
-  |},
-  sourceMapUrl?: string,
-  sourceRoot?: string,
-  warnings?: boolean,
-};
-
-type _Input =
-  | string // code or file name
-  | Array<string> // array of file names
-  | {[filename: string]: string}; // file names and corresponding code
-
-declare module 'uglify-js' {
-  declare function minify(
-    fileOrFilesOrCode: _Input,
-    options?: _Options & {outSourceMap?: ?false | ''},
-  ): _Result<void>;
-  declare function minify(
-    fileOrFilesOrCode: _Input,
-    options?: _Options & {outSourceMap: true | string},
-  ): _Result<string>;
-}
diff --git a/package.json b/package.json
index c8d170040..7ba63c20f 100644
--- a/package.json
+++ b/package.json
@@ -210,7 +210,6 @@
     "stacktrace-parser": "^0.1.3",
     "temp": "0.8.3",
     "throat": "^3.0.0",
-    "uglify-js": "2.7.5",
     "whatwg-fetch": "^1.0.0",
     "wordwrap": "^1.0.0",
     "write-file-atomic": "^1.2.0",