Make it work

packages/babel-highlight/src/chalk.d.ts

@@ -0,0 +1,7 @@
+export * from "chalk-BABEL_8_BREAKING-true";
+
+// TODO: Eventually remove the .default fallback when we fully migrate to chalk 5
+declare const _default:
+  | typeof import("chalk-BABEL_8_BREAKING-false").default
+  | typeof import("chalk-BABEL_8_BREAKING-true").default;
+export { _default as default };

packages/babel-highlight/src/chalk.js

@@ -0,0 +1,10 @@
+/// <reference types="./chalk.d.ts" />
+
+// Chalk provides its own type defintions, but yarn-plugin-conditions does not
+// play well with them. Additionally, we want to provide the same "default"
+// when using ESM and CJS (extracting default from CJS's module.exports).
+// TODO: Remote whis when we fully migrate to chalk 5
+
+export * from "chalk";
+import _chalk from "chalk";
+export default _chalk.default ?? _chalk;

packages/babel-highlight/src/index.ts

@@ -8,11 +8,7 @@ import {
   isKeyword,
 } from "@babel/helper-validator-identifier";
 
-import _chalk, { supportsColor, Chalk, type ChalkInstance } from "chalk";
-// TODO: Eventually remove the .default fallback when we fully migrate to chalk 5
-const chalk =
-  (_chalk as unknown as typeof import("chalk-BABEL_8_BREAKING-false"))
-    .default ?? _chalk;
+import chalk, { supportsColor, Chalk, type ChalkInstance } from "./chalk";
 
 /**
  * Names that are always allowed as identifiers, but also appear as keywords