what's the equivalent usage with the { version: 3, proposals: true }?

[mrdulin]

["@babel/preset-env", { "useBuiltIns": "usage", "corejs": { "version": "3.8", "proposals": true } }]

what's the equivalent usage with above? I want to add the polyfill by myself.

import "core-js";
// or
import "core-js/full";

[zloirock]

proposals option makes no sense for useBuiltIns: entry since that replaces the import of any core-js entry to the import only required modules for your target environments.

In core-js@3, import "core-js" is a full equal of import "core-js/full". In core-js@4 it will be changed and import "core-js" will be equal of import "core-js/actual" ("stable" + stage 3 proposals).

It seems your question is related to useBuiltIns: usage and core-js@3. In this case, with proposals: true used core-js / core-js/full subset of features, with proposals: false (default) - core-js/stable subset.

[mrdulin]

Yes. I updated the question, it's useBuiltIns: usage