@babel/plugin-transform-strict-mode/lib/index.js

This plugin places a 'use strict'; directive at the top of all files to enable strict mode

import { declare } from '@babel/helper-plugin-utils';
import { types } from '@babel/core';

const index = declare(api => {
  api.assertVersion("^7.0.0-0 || ^8.0.0");
  return {
    name: "transform-strict-mode",
    visitor: {
      Program(path) {
        const {
          node
        } = path;
        for (const directive of node.directives) {
          if (directive.value.value === "use strict") return;
        }
        path.unshiftContainer("directives", types.directive(types.directiveLiteral("use strict")));
      }
    }
  };
});

export { index as default };
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