diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 74de8c123..b1ea8233f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x]
+        node-version: [14.x]
 
     steps:
     - uses: actions/checkout@v2
diff --git a/build-tools/babel-cli/README.md b/build-tools/babel-cli/README.md
deleted file mode 100644
index 6ecfe4bc4..000000000
--- a/build-tools/babel-cli/README.md
+++ /dev/null
@@ -1,19 +0,0 @@
-# @babel/cli
-
-> Babel command line.
-
-See our website [@babel/cli](https://babeljs.io/docs/en/babel-cli) for more information or the [issues](https://github.com/babel/babel/issues?utf8=%E2%9C%93&q=is%3Aissue+label%3A%22pkg%3A%20cli%22+is%3Aopen) associated with this package.
-
-## Install
-
-Using npm:
-
-```sh
-npm install --save-dev @babel/cli
-```
-
-or using yarn:
-
-```sh
-yarn add @babel/cli --dev
-```
diff --git a/build-tools/babel-cli/bin/babel.js b/build-tools/babel-cli/bin/babel.js
deleted file mode 100755
index 7c227455f..000000000
--- a/build-tools/babel-cli/bin/babel.js
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/usr/bin/env node
-
-require("../lib/babel");
diff --git a/build-tools/babel-cli/lib/babel/dir.js b/build-tools/babel-cli/lib/babel/dir.js
deleted file mode 100644
index 52acfda8e..000000000
--- a/build-tools/babel-cli/lib/babel/dir.js
+++ /dev/null
@@ -1,208 +0,0 @@
-"use strict";
-
-Object.defineProperty(exports, "__esModule", {
-  value: true
-});
-exports.default = _default;
-
-var util = _interopRequireWildcard(require("./util"));
-
-function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
-
-function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
-
-const debounce = require("lodash/debounce");
-
-const slash = require("slash");
-
-const path = require("path");
-
-const fs = require("fs");
-
-const FILE_TYPE = Object.freeze({
-  NON_COMPILABLE: "NON_COMPILABLE",
-  COMPILED: "COMPILED",
-  IGNORED: "IGNORED",
-  ERR_COMPILATION: "ERR_COMPILATION",
-  NO_REBUILD_NEEDED: "NO_REBUILD_NEEDED"
-});
-
-function outputFileSync(filePath, data) {
-  fs.mkdirSync(path.dirname(filePath), {
-    recursive: true
-  });
-  fs.writeFileSync(filePath, data);
-}
-
-async function _default({
-  cliOptions,
-  babelOptions
-}) {
-  const filenames = cliOptions.filenames;
-
-  async function write(src, base) {
-    let relative = path.relative(base, src);
-
-    if (!util.isCompilableExtension(relative, cliOptions.extensions)) {
-      return FILE_TYPE.NON_COMPILABLE;
-    }
-
-    relative = util.withExtension(relative, cliOptions.keepFileExtension ? path.extname(relative) : cliOptions.outFileExtension);
-    const dest = getDest(relative, base);
-    if (noRebuildNeeded(src, dest)) return FILE_TYPE.NO_REBUILD_NEEDED;
-
-    try {
-      const res = await util.compile(src, Object.assign({}, babelOptions, {
-        sourceFileName: slash(path.relative(dest + "/..", src))
-      }));
-      if (!res) return FILE_TYPE.IGNORED;
-
-      if (res.map && babelOptions.sourceMaps && babelOptions.sourceMaps !== "inline") {
-        const mapLoc = dest + ".map";
-        res.code = util.addSourceMappingUrl(res.code, mapLoc);
-        res.map.file = path.basename(relative);
-        outputFileSync(mapLoc, JSON.stringify(res.map));
-      }
-
-      outputFileSync(dest, res.code);
-      util.chmod(src, dest);
-
-      if (cliOptions.verbose) {
-        console.log(src + " -> " + dest);
-      }
-
-      return FILE_TYPE.COMPILED;
-    } catch (err) {
-      if (cliOptions.watch) {
-        console.error(err);
-        return FILE_TYPE.ERR_COMPILATION;
-      }
-
-      throw err;
-    }
-  }
-
-  function getDest(filename, base) {
-    if (cliOptions.relative) {
-      return path.join(base, cliOptions.outDir, filename);
-    }
-
-    return path.join(cliOptions.outDir, filename);
-  }
-
-  function noRebuildNeeded(src, dest) {
-    if (!cliOptions.incremental) return false;
-
-    try {
-      const srcStat = fs.statSync(src);
-      const destStat = fs.statSync(dest);
-      if (srcStat.ctimeMs < destStat.ctimeMs) return true;
-    } catch (e) {}
-
-    return false;
-  }
-
-  async function handleFile(src, base) {
-    const written = await write(src, base);
-
-    if (cliOptions.copyFiles && written === FILE_TYPE.NON_COMPILABLE || cliOptions.copyIgnored && written === FILE_TYPE.IGNORED) {
-      const filename = path.relative(base, src);
-      const dest = getDest(filename, base);
-      if (noRebuildNeeded(src, dest)) return false;
-      outputFileSync(dest, fs.readFileSync(src));
-      util.chmod(src, dest);
-      return false;
-    }
-
-    return written === FILE_TYPE.COMPILED;
-  }
-
-  async function handle(filenameOrDir) {
-    if (!fs.existsSync(filenameOrDir)) return 0;
-    const stat = fs.statSync(filenameOrDir);
-
-    if (stat.isDirectory()) {
-      const dirname = filenameOrDir;
-      let count = 0;
-      const files = util.readdir(dirname, cliOptions.includeDotfiles);
-
-      for (const filename of files) {
-        const src = path.join(dirname, filename);
-        const written = await handleFile(src, dirname);
-        if (written) count += 1;
-      }
-
-      return count;
-    } else {
-      const filename = filenameOrDir;
-      const written = await handleFile(filename, path.dirname(filename));
-      return written ? 1 : 0;
-    }
-  }
-
-  let compiledFiles = 0;
-  let startTime = null;
-  const logSuccess = debounce(function () {
-    if (startTime === null) {
-      return;
-    }
-
-    const diff = process.hrtime(startTime);
-    console.log(`Successfully compiled ${compiledFiles} ${compiledFiles !== 1 ? "files" : "file"} with Babel (${diff[0] * 1e3 + Math.round(diff[1] / 1e6)}ms).`);
-    compiledFiles = 0;
-    startTime = null;
-  }, 100, {
-    trailing: true
-  });
-
-  if (!cliOptions.skipInitialBuild) {
-    if (cliOptions.deleteDirOnStart) {
-      util.deleteDir(cliOptions.outDir);
-    }
-
-    fs.mkdirSync(cliOptions.outDir, {
-      recursive: true
-    });
-    startTime = process.hrtime();
-
-    for (const filename of cliOptions.filenames) {
-      compiledFiles += await handle(filename);
-    }
-
-    if (!cliOptions.quiet) {
-      logSuccess();
-      logSuccess.flush();
-    }
-  }
-
-  if (cliOptions.watch) {
-    const chokidar = util.requireChokidar();
-    filenames.forEach(function (filenameOrDir) {
-      const watcher = chokidar.watch(filenameOrDir, {
-        persistent: true,
-        ignoreInitial: true,
-        awaitWriteFinish: {
-          stabilityThreshold: 50,
-          pollInterval: 10
-        }
-      });
-      let processing = 0;
-      ["add", "change"].forEach(function (type) {
-        watcher.on(type, async function (filename) {
-          processing++;
-          if (startTime === null) startTime = process.hrtime();
-
-          try {
-            await handleFile(filename, filename === filenameOrDir ? path.dirname(filenameOrDir) : filenameOrDir);
-            compiledFiles++;
-          } catch (err) {
-            console.error(err);
-          }
-
-          processing--;
-          if (processing === 0 && !cliOptions.quiet) logSuccess();
-        });
-      });
-    });
-  }
-}
\ No newline at end of file
diff --git a/build-tools/babel-cli/lib/babel/file.js b/build-tools/babel-cli/lib/babel/file.js
deleted file mode 100644
index c98e5c1ca..000000000
--- a/build-tools/babel-cli/lib/babel/file.js
+++ /dev/null
@@ -1,200 +0,0 @@
-"use strict";
-
-Object.defineProperty(exports, "__esModule", {
-  value: true
-});
-exports.default = _default;
-
-var util = _interopRequireWildcard(require("./util"));
-
-function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
-
-function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
-
-const convertSourceMap = require("convert-source-map");
-
-const sourceMap = require("source-map");
-
-const slash = require("slash");
-
-const path = require("path");
-
-const fs = require("fs");
-
-async function _default({
-  cliOptions,
-  babelOptions
-}) {
-  function buildResult(fileResults) {
-    const map = new sourceMap.SourceMapGenerator({
-      file: cliOptions.sourceMapTarget || path.basename(cliOptions.outFile || "") || "stdout",
-      sourceRoot: babelOptions.sourceRoot
-    });
-    let code = "";
-    let offset = 0;
-
-    for (const result of fileResults) {
-      if (!result) continue;
-      code += result.code + "\n";
-
-      if (result.map) {
-        const consumer = new sourceMap.SourceMapConsumer(result.map);
-        const sources = new Set();
-        consumer.eachMapping(function (mapping) {
-          if (mapping.source != null) sources.add(mapping.source);
-          map.addMapping({
-            generated: {
-              line: mapping.generatedLine + offset,
-              column: mapping.generatedColumn
-            },
-            source: mapping.source,
-            original: mapping.source == null ? null : {
-              line: mapping.originalLine,
-              column: mapping.originalColumn
-            }
-          });
-        });
-        sources.forEach(source => {
-          const content = consumer.sourceContentFor(source, true);
-
-          if (content !== null) {
-            map.setSourceContent(source, content);
-          }
-        });
-        offset = code.split("\n").length - 1;
-      }
-    }
-
-    if (babelOptions.sourceMaps === "inline" || !cliOptions.outFile && babelOptions.sourceMaps) {
-      code += "\n" + convertSourceMap.fromObject(map).toComment();
-    }
-
-    return {
-      map: map,
-      code: code
-    };
-  }
-
-  function output(fileResults) {
-    const result = buildResult(fileResults);
-
-    if (cliOptions.outFile) {
-      fs.mkdirSync(path.dirname(cliOptions.outFile), {
-        recursive: true
-      });
-
-      if (babelOptions.sourceMaps && babelOptions.sourceMaps !== "inline") {
-        const mapLoc = cliOptions.outFile + ".map";
-        result.code = util.addSourceMappingUrl(result.code, mapLoc);
-        fs.writeFileSync(mapLoc, JSON.stringify(result.map));
-      }
-
-      fs.writeFileSync(cliOptions.outFile, result.code);
-    } else {
-      process.stdout.write(result.code + "\n");
-    }
-  }
-
-  function readStdin() {
-    return new Promise((resolve, reject) => {
-      let code = "";
-      process.stdin.setEncoding("utf8");
-      process.stdin.on("readable", function () {
-        const chunk = process.stdin.read();
-        if (chunk !== null) code += chunk;
-      });
-      process.stdin.on("end", function () {
-        resolve(code);
-      });
-      process.stdin.on("error", reject);
-    });
-  }
-
-  async function stdin() {
-    const code = await readStdin();
-    const res = await util.transform(cliOptions.filename, code, Object.assign({}, babelOptions, {
-      sourceFileName: "stdin"
-    }));
-    output([res]);
-  }
-
-  async function walk(filenames) {
-    const _filenames = [];
-    filenames.forEach(function (filename) {
-      if (!fs.existsSync(filename)) return;
-      const stat = fs.statSync(filename);
-
-      if (stat.isDirectory()) {
-        const dirname = filename;
-        util.readdirForCompilable(filename, cliOptions.includeDotfiles, cliOptions.extensions).forEach(function (filename) {
-          _filenames.push(path.join(dirname, filename));
-        });
-      } else {
-        _filenames.push(filename);
-      }
-    });
-    const results = await Promise.all(_filenames.map(async function (filename) {
-      let sourceFilename = filename;
-
-      if (cliOptions.outFile) {
-        sourceFilename = path.relative(path.dirname(cliOptions.outFile), sourceFilename);
-      }
-
-      sourceFilename = slash(sourceFilename);
-
-      try {
-        return await util.compile(filename, Object.assign({}, babelOptions, {
-          sourceFileName: sourceFilename,
-          sourceMaps: babelOptions.sourceMaps === "inline" ? true : babelOptions.sourceMaps
-        }));
-      } catch (err) {
-        if (!cliOptions.watch) {
-          throw err;
-        }
-
-        console.error(err);
-        return null;
-      }
-    }));
-    output(results);
-  }
-
-  async function files(filenames) {
-    if (!cliOptions.skipInitialBuild) {
-      await walk(filenames);
-    }
-
-    if (cliOptions.watch) {
-      const chokidar = util.requireChokidar();
-      chokidar.watch(filenames, {
-        disableGlobbing: true,
-        persistent: true,
-        ignoreInitial: true,
-        awaitWriteFinish: {
-          stabilityThreshold: 50,
-          pollInterval: 10
-        }
-      }).on("all", function (type, filename) {
-        if (!util.isCompilableExtension(filename, cliOptions.extensions) && !filenames.includes(filename)) {
-          return;
-        }
-
-        if (type === "add" || type === "change") {
-          if (cliOptions.verbose) {
-            console.log(type + " " + filename);
-          }
-
-          walk(filenames).catch(err => {
-            console.error(err);
-          });
-        }
-      });
-    }
-  }
-
-  if (cliOptions.filenames.length) {
-    await files(cliOptions.filenames);
-  } else {
-    await stdin();
-  }
-}
\ No newline at end of file
diff --git a/build-tools/babel-cli/lib/babel/index.js b/build-tools/babel-cli/lib/babel/index.js
deleted file mode 100755
index d2f47869a..000000000
--- a/build-tools/babel-cli/lib/babel/index.js
+++ /dev/null
@@ -1,22 +0,0 @@
-#!/usr/bin/env node
-"use strict";
-
-var _options = _interopRequireDefault(require("./options"));
-
-var _dir = _interopRequireDefault(require("./dir"));
-
-var _file = _interopRequireDefault(require("./file"));
-
-function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
-
-const opts = (0, _options.default)(process.argv);
-
-if (opts) {
-  const fn = opts.cliOptions.outDir ? _dir.default : _file.default;
-  fn(opts).catch(err => {
-    console.error(err);
-    process.exitCode = 1;
-  });
-} else {
-  process.exitCode = 2;
-}
\ No newline at end of file
diff --git a/build-tools/babel-cli/lib/babel/options.js b/build-tools/babel-cli/lib/babel/options.js
deleted file mode 100644
index a1a560839..000000000
--- a/build-tools/babel-cli/lib/babel/options.js
+++ /dev/null
@@ -1,218 +0,0 @@
-"use strict";
-
-Object.defineProperty(exports, "__esModule", {
-  value: true
-});
-exports.default = parseArgv;
-
-function _core() {
-  const data = require("@babel/core");
-
-  _core = function () {
-    return data;
-  };
-
-  return data;
-}
-
-const fs = require("fs");
-
-const commander = require("commander");
-
-const glob = require("glob");
-
-commander.option("-f, --filename [filename]", "The filename to use when reading from stdin. This will be used in source-maps, errors etc.");
-commander.option("--presets [list]", "A comma-separated list of preset names.", collect);
-commander.option("--plugins [list]", "A comma-separated list of plugin names.", collect);
-commander.option("--config-file [path]", "Path to a .babelrc file to use.");
-commander.option("--env-name [name]", "The name of the 'env' to use when loading configs and plugins. " + "Defaults to the value of BABEL_ENV, or else NODE_ENV, or else 'development'.");
-commander.option("--root-mode [mode]", "The project-root resolution mode. " + "One of 'root' (the default), 'upward', or 'upward-optional'.");
-commander.option("--source-type [script|module]", "");
-commander.option("--no-babelrc", "Whether or not to look up .babelrc and .babelignore files.");
-commander.option("--ignore [list]", "List of glob paths to **not** compile.", collect);
-commander.option("--only [list]", "List of glob paths to **only** compile.", collect);
-commander.option("--no-highlight-code", "Enable or disable ANSI syntax highlighting of code frames. (on by default)");
-commander.option("--no-comments", "Write comments to generated output. (true by default)");
-commander.option("--retain-lines", "Retain line numbers. This will result in really ugly code.");
-commander.option("--compact [true|false|auto]", "Do not include superfluous whitespace characters and line terminators.", booleanify);
-commander.option("--minified", "Save as many bytes when printing. (false by default)");
-commander.option("--auxiliary-comment-before [string]", "Print a comment before any injected non-user code.");
-commander.option("--auxiliary-comment-after [string]", "Print a comment after any injected non-user code.");
-commander.option("-s, --source-maps [true|false|inline|both]", "", booleanify);
-commander.option("--source-map-target [string]", "Set `file` on returned source map.");
-commander.option("--source-file-name [string]", "Set `sources[0]` on returned source map.");
-commander.option("--source-root [filename]", "The root from which all sources are relative.");
-
-if (!process.env.BABEL_8_BREAKING) {
-  commander.option("--module-root [filename]", "Optional prefix for the AMD module formatter that will be prepended to the filename on module definitions.");
-  commander.option("-M, --module-ids", "Insert an explicit id for modules.");
-  commander.option("--module-id [string]", "Specify a custom name for module ids.");
-}
-
-commander.option("-x, --extensions [extensions]", "List of extensions to compile when a directory has been the input. [.es6,.js,.es,.jsx,.mjs]", collect);
-commander.option("--keep-file-extension", "Preserve the file extensions of the input files.");
-commander.option("-w, --watch", "Recompile files on changes.");
-commander.option("--skip-initial-build", "Do not compile files before watching.");
-commander.option("--incremental", "Only compile files with modification time before corresponding output file");
-commander.option("-o, --out-file [out]", "Compile all input files into a single file.");
-commander.option("-d, --out-dir [out]", "Compile an input directory of modules into an output directory.");
-commander.option("--relative", "Compile into an output directory relative to input directory or file. Requires --out-dir [out]");
-commander.option("-D, --copy-files", "When compiling a directory copy over non-compilable files.");
-commander.option("--include-dotfiles", "Include dotfiles when compiling and copying non-compilable files.");
-commander.option("--no-copy-ignored", "Exclude ignored files when copying non-compilable files.");
-commander.option("--verbose", "Log everything. This option conflicts with --quiet");
-commander.option("--quiet", "Don't log anything. This option conflicts with --verbose");
-commander.option("--delete-dir-on-start", "Delete the out directory before compilation.");
-commander.option("--out-file-extension [string]", "Use a specific extension for the output files");
-commander.version("7.13.14" + " (@babel/core " + _core().version + ")");
-commander.usage("[options] <files ...>");
-commander.action(() => {});
-
-function parseArgv(args) {
-  commander.parse(args);
-  const errors = [];
-  let filenames = commander.args.reduce(function (globbed, input) {
-    let files = glob.sync(input);
-    if (!files.length) files = [input];
-    return globbed.concat(files);
-  }, []);
-  filenames = Array.from(new Set(filenames));
-  filenames.forEach(function (filename) {
-    if (!fs.existsSync(filename)) {
-      errors.push(filename + " does not exist");
-    }
-  });
-
-  if (commander.outDir && !filenames.length) {
-    errors.push("--out-dir requires filenames");
-  }
-
-  if (commander.outFile && commander.outDir) {
-    errors.push("--out-file and --out-dir cannot be used together");
-  }
-
-  if (commander.relative && !commander.outDir) {
-    errors.push("--relative requires --out-dir usage");
-  }
-
-  if (commander.watch) {
-    if (!commander.outFile && !commander.outDir) {
-      errors.push("--watch requires --out-file or --out-dir");
-    }
-
-    if (!filenames.length) {
-      errors.push("--watch requires filenames");
-    }
-  }
-
-  if (commander.skipInitialBuild && !commander.watch) {
-    errors.push("--skip-initial-build requires --watch");
-  }
-
-  if (commander.incremental && !commander.outDir) {
-    errors.push("--incremental requires --out-dir");
-  }
-
-  if (commander.deleteDirOnStart && !commander.outDir) {
-    errors.push("--delete-dir-on-start requires --out-dir");
-  }
-
-  if (commander.verbose && commander.quiet) {
-    errors.push("--verbose and --quiet cannot be used together");
-  }
-
-  if (!commander.outDir && filenames.length === 0 && typeof commander.filename !== "string" && commander.babelrc !== false) {
-    errors.push("stdin compilation requires either -f/--filename [filename] or --no-babelrc");
-  }
-
-  if (commander.keepFileExtension && commander.outFileExtension) {
-    errors.push("--out-file-extension cannot be used with --keep-file-extension");
-  }
-
-  if (errors.length) {
-    console.error("babel:");
-    errors.forEach(function (e) {
-      console.error("  " + e);
-    });
-    return null;
-  }
-
-  const opts = commander.opts();
-  const babelOptions = {
-    presets: opts.presets,
-    plugins: opts.plugins,
-    rootMode: opts.rootMode,
-    configFile: opts.configFile,
-    envName: opts.envName,
-    sourceType: opts.sourceType,
-    ignore: opts.ignore,
-    only: opts.only,
-    retainLines: opts.retainLines,
-    compact: opts.compact,
-    minified: opts.minified,
-    auxiliaryCommentBefore: opts.auxiliaryCommentBefore,
-    auxiliaryCommentAfter: opts.auxiliaryCommentAfter,
-    sourceMaps: opts.sourceMaps,
-    sourceFileName: opts.sourceFileName,
-    sourceRoot: opts.sourceRoot,
-    babelrc: opts.babelrc === true ? undefined : opts.babelrc,
-    highlightCode: opts.highlightCode === true ? undefined : opts.highlightCode,
-    comments: opts.comments === true ? undefined : opts.comments
-  };
-
-  if (!process.env.BABEL_8_BREAKING) {
-    Object.assign(babelOptions, {
-      moduleRoot: opts.moduleRoot,
-      moduleIds: opts.moduleIds,
-      moduleId: opts.moduleId
-    });
-  }
-
-  for (const key of Object.keys(babelOptions)) {
-    if (babelOptions[key] === undefined) {
-      delete babelOptions[key];
-    }
-  }
-
-  return {
-    babelOptions,
-    cliOptions: {
-      filename: opts.filename,
-      filenames,
-      extensions: opts.extensions,
-      keepFileExtension: opts.keepFileExtension,
-      outFileExtension: opts.outFileExtension,
-      watch: opts.watch,
-      skipInitialBuild: opts.skipInitialBuild,
-      incremental: opts.incremental,
-      outFile: opts.outFile,
-      outDir: opts.outDir,
-      relative: opts.relative,
-      copyFiles: opts.copyFiles,
-      copyIgnored: opts.copyFiles && opts.copyIgnored,
-      includeDotfiles: opts.includeDotfiles,
-      verbose: opts.verbose,
-      quiet: opts.quiet,
-      deleteDirOnStart: opts.deleteDirOnStart,
-      sourceMapTarget: opts.sourceMapTarget
-    }
-  };
-}
-
-function booleanify(val) {
-  if (val === "true" || val == 1) {
-    return true;
-  }
-
-  if (val === "false" || val == 0 || !val) {
-    return false;
-  }
-
-  return val;
-}
-
-function collect(value, previousValue) {
-  if (typeof value !== "string") return previousValue;
-  const values = value.split(",");
-  return previousValue ? previousValue.concat(values) : values;
-}
\ No newline at end of file
diff --git a/build-tools/babel-cli/lib/babel/util.js b/build-tools/babel-cli/lib/babel/util.js
deleted file mode 100644
index bcd42af82..000000000
--- a/build-tools/babel-cli/lib/babel/util.js
+++ /dev/null
@@ -1,138 +0,0 @@
-"use strict";
-
-Object.defineProperty(exports, "__esModule", {
-  value: true
-});
-exports.chmod = chmod;
-exports.readdir = readdir;
-exports.readdirForCompilable = readdirForCompilable;
-exports.isCompilableExtension = isCompilableExtension;
-exports.addSourceMappingUrl = addSourceMappingUrl;
-exports.transform = transform;
-exports.compile = compile;
-exports.deleteDir = deleteDir;
-exports.requireChokidar = requireChokidar;
-exports.withExtension = withExtension;
-
-function babel() {
-  const data = _interopRequireWildcard(require("@babel/core"));
-
-  babel = function () {
-    return data;
-  };
-
-  return data;
-}
-
-function _module() {
-  const data = require("module");
-
-  _module = function () {
-    return data;
-  };
-
-  return data;
-}
-
-function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
-
-function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
-
-const readdirRecursive = require("fs-readdir-recursive");
-
-const path = require("path");
-
-const fs = require("fs");
-
-function chmod(src, dest) {
-  try {
-    fs.chmodSync(dest, fs.statSync(src).mode);
-  } catch (err) {
-    console.warn(`Cannot change permissions of ${dest}`);
-  }
-}
-
-function readdir(dirname, includeDotfiles, filter) {
-  return readdirRecursive(dirname, (filename, _index, currentDirectory) => {
-    const stat = fs.statSync(path.join(currentDirectory, filename));
-    if (stat.isDirectory()) return true;
-    return (includeDotfiles || filename[0] !== ".") && (!filter || filter(filename));
-  });
-}
-
-function readdirForCompilable(dirname, includeDotfiles, altExts) {
-  return readdir(dirname, includeDotfiles, function (filename) {
-    return isCompilableExtension(filename, altExts);
-  });
-}
-
-function isCompilableExtension(filename, altExts) {
-  const exts = altExts || babel().DEFAULT_EXTENSIONS;
-  const ext = path.extname(filename);
-  return exts.includes(ext);
-}
-
-function addSourceMappingUrl(code, loc) {
-  return code + "\n//# sourceMappingURL=" + path.basename(loc);
-}
-
-const CALLER = {
-  name: "@babel/cli"
-};
-
-function transform(filename, code, opts) {
-  opts = Object.assign({}, opts, {
-    caller: CALLER,
-    filename
-  });
-  return new Promise((resolve, reject) => {
-    babel().transform(code, opts, (err, result) => {
-      if (err) reject(err);else resolve(result);
-    });
-  });
-}
-
-function compile(filename, opts) {
-  opts = Object.assign({}, opts, {
-    caller: CALLER
-  });
-  return new Promise((resolve, reject) => {
-    babel().transformFile(filename, opts, (err, result) => {
-      if (err) reject(err);else resolve(result);
-    });
-  });
-}
-
-function deleteDir(path) {
-  if (fs.existsSync(path)) {
-    fs.readdirSync(path).forEach(function (file) {
-      const curPath = path + "/" + file;
-
-      if (fs.lstatSync(curPath).isDirectory()) {
-        deleteDir(curPath);
-      } else {
-        fs.unlinkSync(curPath);
-      }
-    });
-    fs.rmdirSync(path);
-  }
-}
-
-process.on("uncaughtException", function (err) {
-  console.error(err);
-  process.exitCode = 1;
-});
-
-function requireChokidar() {
-  try {
-    return parseInt(process.versions.node) >= 8 ? require("chokidar") : require("@nicolo-ribaudo/chokidar-2");
-  } catch (err) {
-    console.error("The optional dependency chokidar failed to install and is required for " + "--watch. Chokidar is likely not supported on your platform.");
-    throw err;
-  }
-}
-
-function withExtension(filename, ext = ".js") {
-  const newBasename = path.basename(filename, path.extname(filename)) + ext;
-  return path.join(path.dirname(filename), newBasename);
-}
\ No newline at end of file
diff --git a/build-tools/babel-cli/package.json b/build-tools/babel-cli/package.json
deleted file mode 100644
index 022f40153..000000000
--- a/build-tools/babel-cli/package.json
+++ /dev/null
@@ -1,52 +0,0 @@
-{
-  "name": "@babel/cli",
-  "version": "7.13.14",
-  "description": "Babel command line.",
-  "author": "Sebastian McKenzie <sebmck@gmail.com>",
-  "homepage": "https://babel.dev/docs/en/next/babel-cli",
-  "bugs": "https://github.com/babel/babel/issues?utf8=%E2%9C%93&q=is%3Aissue+label%3A%22pkg%3A%20cli%22+is%3Aopen",
-  "license": "MIT",
-  "publishConfig": {
-    "access": "public"
-  },
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/babel/babel.git",
-    "directory": "packages/babel-cli"
-  },
-  "keywords": [
-    "6to5",
-    "babel",
-    "es6",
-    "transpile",
-    "transpiler",
-    "babel-cli",
-    "compiler"
-  ],
-  "dependencies": {
-    "commander": "^4.0.1",
-    "convert-source-map": "^1.1.0",
-    "fs-readdir-recursive": "^1.1.0",
-    "glob": "^7.0.0",
-    "lodash": "^4.17.19",
-    "make-dir": "^2.1.0",
-    "slash": "condition:BABEL_8_BREAKING ? ^3.0.0 : ^2.0.0",
-    "source-map": "^0.5.0"
-  },
-  "optionalDependencies": {
-    "@nicolo-ribaudo/chokidar-2": "condition:BABEL_8_BREAKING ? : 2.1.8-no-fsevents",
-    "chokidar": "^3.4.0"
-  },
-  "peerDependencies": {
-    "@babel/core": "^7.0.0-0"
-  },
-  "devDependencies": {
-    "@babel/core": "workspace:*",
-    "@babel/helper-fixtures": "workspace:*",
-    "rimraf": "^3.0.0"
-  },
-  "bin": {
-    "babel": "./bin/babel.js",
-    "babel-external-helpers": "./bin/babel-external-helpers.js"
-  }
-}
diff --git a/build-tools/compiler.js b/build-tools/compiler.js
new file mode 100644
index 000000000..998c5f97f
--- /dev/null
+++ b/build-tools/compiler.js
@@ -0,0 +1,224 @@
+/**
+ * Tiny wrapper around babel/core to do most of the things babel-cli does,
+ * plus incremental compilation
+ *
+ * Adds one option in addition to babel's built-in options: `incremental`
+ *
+ * Heavily copied from `babel-cli`: https://github.com/babel/babel/tree/main/packages/babel-cli
+ *
+ * @author Guangcong Luo <guangcongluo@gmail.com>
+ * @license MIT
+ */
+
+const babel = require('@babel/core');
+const fs = require('fs');
+const path = require('path');
+const sourceMap = require('source-map');
+
+const VERBOSE = false;
+
+function outputFileSync(filePath, res, opts) {
+  fs.mkdirSync(path.dirname(filePath), {recursive: true});
+
+  // we've requested explicit sourcemaps to be written to disk
+  if (
+    res.map &&
+    opts.sourceMaps &&
+    opts.sourceMaps !== "inline"
+  ) {
+    const mapLoc = filePath + ".map";
+    res.code += "\n//# sourceMappingURL=" + path.basename(mapLoc);
+    res.map.file = path.basename(filePath);
+    fs.writeFileSync(mapLoc, JSON.stringify(res.map));
+  }
+
+  fs.writeFileSync(filePath, res.code);
+}
+
+function slash(path) {
+	const isExtendedLengthPath = /^\\\\\?\\/.test(path);
+	const hasNonAscii = /[^\u0000-\u0080]+/.test(path);
+
+	if (isExtendedLengthPath || hasNonAscii) {
+		return path;
+	}
+
+	return path.replace(/\\/g, '/');
+}
+
+function combineResults(fileResults, sourceMapOptions, opts) {
+  let map = null;
+  if (fileResults.some(result => result?.map)) {
+    map = new sourceMap.SourceMapGenerator(sourceMapOptions);
+  }
+
+  let code = "";
+  let offset = 0;
+
+  for (const result of fileResults) {
+    if (!result) continue;
+
+    code += result.code + "\n";
+
+    if (result.map) {
+      const consumer = new sourceMap.SourceMapConsumer(result.map);
+      const sources = new Set();
+
+      consumer.eachMapping(function (mapping) {
+        if (mapping.source != null) sources.add(mapping.source);
+
+        map.addMapping({
+          generated: {
+            line: mapping.generatedLine + offset,
+            column: mapping.generatedColumn,
+          },
+          source: mapping.source,
+          original:
+            mapping.source == null
+              ? null
+              : {
+                  line: mapping.originalLine,
+                  column: mapping.originalColumn,
+                },
+        });
+      });
+
+      for (const source of sources) {
+        const content = consumer.sourceContentFor(source, true);
+        if (content !== null) {
+          map.setSourceContent(source, content);
+        }
+      }
+
+      offset = code.split("\n").length - 1;
+    }
+  }
+
+  if (opts.sourceMaps === "inline") {
+    const json = JSON.stringify(map);
+    const base64 = Buffer.from(json, 'utf8').toString('base64');
+    code += "\n//# sourceMappingURL=data:application/json;charset=utf-8;base64," + base64;
+  }
+
+  return {
+    map: map,
+    code: code,
+  };
+}
+
+function noRebuildNeeded(src, dest) {
+  try {
+    const srcStat = fs.statSync(src, {throwIfNoEntry: false});
+    if (!srcStat) return true;
+    const destStat = fs.statSync(dest);
+    if (srcStat.ctimeMs < destStat.ctimeMs) return true;
+  } catch (e) {}
+
+  return false;
+}
+
+function compileToDir(srcDir, destDir, opts = {}) {
+  const incremental = opts.incremental;
+  delete opts.incremental;
+
+  function handleFile(src, base) {
+    let relative = path.relative(base, src);
+
+    if (!relative.endsWith('.ts') && !relative.endsWith('.tsx')) {
+      return 0;
+    }
+
+    relative = relative.slice(0, relative.endsWith('.tsx') ? -4 : -3) + '.js';
+
+    const dest = path.join(destDir, relative);
+
+    if (incremental && noRebuildNeeded(src, dest)) return 0;
+
+    const res = babel.transformFileSync(src, {
+      ...opts,
+      sourceFileName: slash(path.relative(dest + "/..", src)),
+    });
+
+    if (!res) return 0;
+
+    outputFileSync(dest, res, opts);
+    fs.chmodSync(dest, fs.statSync(src).mode);
+
+    if (VERBOSE) {
+      console.log(src + " -> " + dest);
+    }
+
+    return 1;
+  }
+
+  function handle(src, base) {
+    const stat = fs.statSync(src, {throwIfNoEntry: false});
+
+    if (!stat) return 0;
+
+    if (stat.isDirectory()) {
+      if (!base) base = src;
+
+      let count = 0;
+
+      const files = fs.readdirSync(src);
+      for (const filename of files) {
+        if (filename.startsWith('.')) continue;
+
+        const srcFile = path.join(src, filename);
+
+        count += handle(srcFile, base);
+      }
+
+      return count;
+    } else {
+      if (!base) base = path.dirname(src);
+      return handleFile(src, base);
+    }
+  }
+
+  let total = 0;
+  fs.mkdirSync(destDir, {recursive: true});
+  const srcDirs = typeof srcDir === 'string' ? [srcDir] : srcDir;
+  for (const dir of srcDirs) total += handle(dir);
+  if (incremental) opts.incremental = true; // incredibly dumb hack to preserve the option
+  return total;
+}
+
+function compileToFile(srcFile, destFile, opts) {
+  const incremental = opts.incremental;
+  delete opts.incremental;
+
+  const srcFiles = typeof srcFile === 'string' ? [srcFile] : srcFile;
+
+  if (incremental && srcFiles.every(src => noRebuildNeeded(src, destFile))) {
+    opts.incremental = true; // incredibly dumb hack to preserve the option
+    return 0;
+  }
+
+  const results = [];
+
+  for (const src of srcFiles) {
+    if (!fs.existsSync(src)) continue;
+
+    const res = babel.transformFileSync(src, opts);
+
+    if (res) results.push(res);
+
+    if (VERBOSE) console.log(src + " ->");
+  }
+
+  const combined = combineResults(results, {
+    file: path.basename(destFile),
+    sourceRoot: opts.sourceRoot,
+  }, opts);
+  outputFileSync(destFile, combined, opts);
+
+  if (VERBOSE) console.log("-> " + destFile);
+  if (incremental) opts.incremental = true; // incredibly dumb hack to preserve the option
+  return results.length;
+}
+
+exports.compileToDir = compileToDir;
+
+exports.compileToFile = compileToFile;
diff --git a/build-tools/update b/build-tools/update
index bb5bf905c..549ec0dfb 100755
--- a/build-tools/update
+++ b/build-tools/update
@@ -12,6 +12,7 @@ const path = require('path');
 const fs = require('fs');
 const crypto = require('crypto');
 const child_process = require('child_process');
+const compiler = require('./compiler');
 
 const thisDir = __dirname;
 const rootDir = path.resolve(thisDir, '..');
@@ -71,46 +72,54 @@ console.log("DONE");
  * Compile TS files
  *********************************************************/
 
-let ignoreGraphics = ' --ignore "src/battle-animations.js","src/battle-animations-moves.js"';
+process.stdout.write("Compiling TS files... ");
+
+let compileStartTime = process.hrtime();
+let compiledFiles = 0;
+
+let compileOpts = {
+	incremental: true,
+	ignore: ['src/battle-animations.js', 'src/battle-animations-moves.js'],
+};
 if (process.argv[2] === 'full') {
-	ignoreGraphics = '';
+	delete compileOpts.ignore;
 } else {
 	try {
 		fs.statSync('data/graphics.js');
 		// graphics.js exists, recompile it
-		ignoreGraphics = '';
+		delete compileOpts.ignore;
 	} catch (e) {}
 }
 
-child_process.execSync(`node build-tools/babel-cli/bin/babel.js src --out-dir js --extensions ".ts,.tsx" --incremental${ignoreGraphics} --source-maps`);
+compiledFiles += compiler.compileToDir(`src`, `js`, compileOpts);
 
-let textData = '';
-try {
-	textData = fs.readFileSync('data/text.js');
-} catch (e) {}
+compiledFiles += compiler.compileToDir(`src`, `js`, compileOpts);
 
-fs.writeFileSync(
+compiledFiles += compiler.compileToFile(
+	['src/battle-dex.ts', 'src/battle-dex-data.ts', 'src/battle-log.ts', 'src/battle-log-misc.js', 'data/text.js', 'src/battle-text-parser.ts'],
 	'js/battledata.js',
-	fs.readFileSync('js/battle-dex.js') + '\n\n' +
-		fs.readFileSync('js/battle-dex-data.js') + '\n\n' +
-		fs.readFileSync('js/battle-log.js') + '\n\n' +
-		fs.readFileSync('src/battle-log-misc.js') +
-		textData + '\n\n' +
-		fs.readFileSync('js/battle-text-parser.js')
+	compileOpts
 );
 
-if (!ignoreGraphics) {
-	fs.writeFileSync(
+if (!compileOpts.ignore) {
+	compiledFiles += compiler.compileToFile(
+		['src/battle-animations.ts', 'src/battle-animations-moves.ts'],
 		'data/graphics.js',
-		fs.readFileSync('js/battle-animations.js') + '\n\n' +
-			fs.readFileSync('js/battle-animations-moves.js')
+		compileOpts
 	);
 }
 
+const diff = process.hrtime(compileStartTime);
+console.log(
+	`(${compiledFiles} ${compiledFiles !== 1 ? "files" : "file"} in ${diff[0] + Math.round(diff[1] / 1e6) / 1e3}s) DONE`
+);
+
 /*********************************************************
  * Update cachebuster and News
  *********************************************************/
 
+process.stdout.write("Updating cachebuster and URLs... ");
+
 const URL_REGEX = /(src|href)="\/(.*?)(\?[a-z0-9]*?)?"/g;
 
 function updateURL(a, b, c, d) {
@@ -134,19 +143,15 @@ function updateURL(a, b, c, d) {
 }
 
 function writeFiles(indexContents, preactIndexContents, crossprotocolContents, replayEmbedContents) {
-	process.stdout.write("Writing new HTML files... ");
 	fs.writeFileSync('index.html', indexContents);
 	fs.writeFileSync('preactalpha.html', preactIndexContents);
 	fs.writeFileSync('crossprotocol.html', crossprotocolContents);
-	console.log("DONE");
-	process.stdout.write("Writing replay-embed.js... ");
 	fs.writeFileSync('js/replay-embed.js', replayEmbedContents);
 	console.log("DONE");
 }
 
 function updateFiles() {
 	// add hashes to js and css files and rewrite URLs
-	process.stdout.write("Updating hashes and URLs... ");
 	let indexContents = fs.readFileSync('index.template.html', {encoding: 'utf8'});
 	indexContents = indexContents.replace(URL_REGEX, updateURL);
 	let preactIndexContents = fs.readFileSync('preactalpha.template.html', {encoding: 'utf8'});
@@ -155,11 +160,10 @@ function updateFiles() {
 	crossprotocolContents = crossprotocolContents.replace(URL_REGEX, updateURL);
 	let replayEmbedContents = fs.readFileSync('js/replay-embed.template.js', {encoding: 'utf8'});
 	replayEmbedContents = replayEmbedContents.replace(/play\.pokemonshowdown\.com/g, routes.client);
-	console.log("DONE");
 
 	// add news, only if it's actually likely to exist
 	if (__dirname.endsWith('play.pokemonshowdown.com/build-tools')) {
-		process.stdout.write("Updating news... ");
+		process.stdout.write("and news... ");
 		child_process.exec('php ' + path.resolve(thisDir, 'news-data.php'), function (error, stdout, stderr) {
 			let newsData = [0, '[failed to retrieve news]'];
 			if (!error && !stderr) {
@@ -174,7 +178,6 @@ function updateFiles() {
 
 			indexContents = indexContents.replace(/<!-- newsid -->/g, newsData[0]);
 			indexContents = indexContents.replace(/<!-- news -->/g, newsData[1]);
-			console.log("DONE");
 
 			writeFiles(indexContents, preactIndexContents, crossprotocolContents, replayEmbedContents);
 		});
diff --git a/package.json b/package.json
index 1a9b4e4a4..8ca2977ca 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,6 @@
     "build-full": "node build full"
   },
   "dependencies": {
-    "@babel/cli": "^7.13.14",
     "@babel/core": "^7.13.15",
     "@babel/plugin-proposal-class-properties": "^7.13.0",
     "@babel/plugin-transform-react-jsx": "^7.13.12",