convert @babel/highlight to typescript (#12432)

Co-authored-by: Nicolò Ribaudo <nicolo.ribaudo@gmail.com>

lib/babel-packages.js.flow

@@ -177,3 +177,25 @@ declare module "@babel/generator" {
   declare module.exports: any;
 }
 
+declare module "@babel/highlight" {
+  import typeof { Chalk } from "chalk";
+  declare type Options = {
+    forceColor?: boolean,
+  };
+
+  /**
+   * Whether the code should be highlighted given the passed options.
+   */
+  declare function shouldHighlight(options: Options): boolean;
+
+  /**
+   * The Chalk instance that should be used given the passed options.
+   */
+  declare function getChalk(options: Options): Chalk;
+
+  /**
+   * Highlight `code`.
+   */
+  declare export default function highlight(code: string, options?: Options): string;
+    declare export { getChalk, shouldHighlight };
+}

lib/third-party-libs.d.ts

@@ -0,0 +1,5 @@
+declare module "js-tokens" {
+  // TODO(Babel 8): Remove this
+  export { default } from "js-tokens-BABEL_8_BREAKING-true";
+  export * from "js-tokens-BABEL_8_BREAKING-true";
+}