stdout.txt

@babel/preset-env: `DEBUG` option

Using targets:
{
  "chrome": "52",
  "firefox": "50",
  "ie": "11"
}

Using modules transform: auto

Using plugins:
  transform-class-static-block { chrome < 94, firefox < 93, ie }
  transform-private-property-in-object { chrome < 91, firefox < 90, ie }
  transform-class-properties { chrome < 74, firefox < 90, ie }
  transform-private-methods { chrome < 84, firefox < 90, ie }
  transform-numeric-separator { chrome < 75, firefox < 70, ie }
  transform-logical-assignment-operators { chrome < 85, firefox < 79, ie }
  transform-nullish-coalescing-operator { chrome < 80, firefox < 72, ie }
  transform-optional-chaining { chrome < 91, firefox < 74, ie }
  transform-json-strings { chrome < 66, firefox < 62, ie }
  transform-optional-catch-binding { chrome < 66, firefox < 58, ie }
  transform-parameters { firefox < 53, ie }
  transform-async-generator-functions { chrome < 63, firefox < 57, ie }
  transform-object-rest-spread { chrome < 60, firefox < 55, ie }
  transform-dotall-regex { chrome < 62, firefox < 78, ie }
  transform-unicode-property-regex { chrome < 64, firefox < 78, ie }
  transform-named-capturing-groups-regex { chrome < 64, firefox < 78, ie }
  transform-async-to-generator { chrome < 55, firefox < 52, ie }
  transform-exponentiation-operator { firefox < 52, ie }
  transform-template-literals { ie }
  transform-literals { firefox < 53, ie }
  transform-function-name { firefox < 53, ie }
  transform-arrow-functions { ie }
  transform-classes { ie }
  transform-object-super { ie }
  transform-shorthand-properties { ie }
  transform-duplicate-keys { ie }
  transform-computed-properties { ie }
  transform-for-of { firefox < 53, ie }
  transform-sticky-regex { ie }
  transform-unicode-escapes { firefox < 53, ie }
  transform-unicode-regex { ie }
  transform-spread { ie }
  transform-destructuring { firefox < 53, ie }
  transform-block-scoping { firefox < 53, ie }
  transform-typeof-symbol { ie }
  transform-new-target { ie }
  transform-regenerator { firefox < 53, ie }
  transform-export-namespace-from { chrome < 72, firefox < 80, ie }
  transform-modules-commonjs
  transform-dynamic-import
  syntax-import-meta
  syntax-import-assertions
corejs3: `DEBUG` option

Using targets: {
  "chrome": "52",
  "firefox": "50",
  "ie": "11"
}

Using polyfills with `usage-global` method:
regenerator: `DEBUG` option

Using targets: {}

Using polyfills with `usage-global` method:

[<CWD>/packages/babel-preset-env/test/fixtures/debug-babel-7/usage-corejs3-shippedProposals-1/input.js]
The corejs3 polyfill added the following polyfills:
  es.object.to-string { "firefox":"50", "ie":"11" }
  es.promise { "chrome":"52", "firefox":"50", "ie":"11" }
  es.array.iterator { "chrome":"52", "firefox":"50", "ie":"11" }
  es.map { "firefox":"50", "ie":"11" }
  es.string.iterator { "ie":"11" }
  web.dom-collections.iterator { "chrome":"52", "firefox":"50", "ie":"11" }
  web.queue-microtask { "chrome":"52", "firefox":"50", "ie":"11" }
  esnext.global-this { "chrome":"52", "firefox":"50", "ie":"11" }

[<CWD>/packages/babel-preset-env/test/fixtures/debug-babel-7/usage-corejs3-shippedProposals-1/input.js]
Based on your code and targets, the regenerator polyfill did not add any polyfill.