Can't import files in `lib/`

[fisker]

Since Node.js 17, require("diff/lib/patch/create.js") throws an error.

node:internal/modules/cjs/loader:488
      throw e;
      ^

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './lib/patch/create.js' is not defined by "exports" in <CWD>\node_modules\diff\package.json

There is also a warning when doing this on Node.js 16

(node:16332) [DEP0148] DeprecationWarning: Use of deprecated folder mapping "./" in the "exports" field module resolution of the package at <CWD>\node_modules\diff\package.json.
Update this package.json to use a subpath pattern like "./*".
(Use `node --trace-deprecation ...` to show where the warning was created)