@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

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
var _helperPluginUtils = require("@babel/helper-plugin-utils");
var _core = require("@babel/core");
var _default = exports.default = (0, _helperPluginUtils.declare)(api => {
  api.assertVersion(7);
  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", _core.types.directive(_core.types.directiveLiteral("use strict")));
      }
    }
  };
});

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