i use a few of new features that do not support, but it installed all polyfill.

[babel-bot]

Issue originally reported by @ouzhou in babel/babel-preset-env#450

for example, i only use Array.of() when i set "useBuiltIns": true, "targets": { "ie": 9 }, , but i get all polyfills which IE9 not support.

my babel-preset-env version is @1.6.1

and i tried using @next and set "useBuiltIns": "entry", but it warned Cannot read property 'loose' of undefined

[babel-bot]

Comment originally made by @existentialism

@ouzhou with version 1.6.1, it will load all polyfills needed for your target environment(s), which is an improvement from babel-polyfill which loads all polyfills regardless.

With version 2.x, useBuiltIns: entry matches this behavior, while useBuiltIns: usage will only add polyfills based on your code.

As for the loose option, can you provide your Babel config?

[babel-bot]

Comment originally made by @weizongqi1990

I have the same problem.
It my Babel config

{
  "plugins": [
      "lodash",
      "transform-runtime",
      "transform-proto-to-assign",
      "transform-decorators-legacy",
      "transform-decorators",
      "transform-class-properties"
  ],
  "presets": [["env",  {
      "loose": true,
      "module": false,
      "useBuiltIns": "entry",
      "targets": {
        "browsers": ["last 2 versions", "safari >= 7", "ie 9"]
      }
  }], "react", "stage-3", "flow"]
}

[babel-bot]

Comment originally made by @nicolo-ribaudo

@weizongqi1990 Can you also provide your package.json?

As a side note, I transform-decorators and transform-decorators-legacy are incompatible.

[babel-bot]

Comment originally made by @weizongqi1990

@nicolo-ribaudo
Thanks.

{
    "name": "front-end",
    "version": "0.0.1",
    "description": "front-end",
    "main": "index.js",
    "author": "weizongqi1990",
    "license": "MIT",
    "config": {
        "webpack": "node_modules/.bin/webpack",
        "dllConfig": "./bulid/webpack/webpack.dll.config.js",
        "passportConfig": "./bulid/webpack/webpack.passport.config.js",
        "wwwConfig": "./bulid/webpack/webpack.www.config.js"
    },
    "scripts": {
        "predev:watch": "NODE_ENV=dev:local concurrently \"$npm_package_config_webpack --config $npm_package_config_dllConfig\"",
        "dev:watch": "NODE_ENV=dev:local concurrently \"node_modules/.bin/webpack-dev-server --config ./bulid/webpack/index.js\"",
        "build": "NODE_ENV=production concurrently \"$npm_package_config_webpack --config $npm_package_config_passportConfig\" \"$npm_package_config_webpack --config $npm_package_config_wwwConfig\"",
        "build:as": "BUILD_TYPE=as NODE_ENV=production concurrently \"$npm_package_config_webpack --config $npm_package_config_passportConfig\" \"$npm_package_config_webpack --config $npm_package_config_wwwConfig\"",
        "buildwww": "NODE_ENV=production concurrently \"$npm_package_config_webpack --config $npm_package_config_wwwConfig\"",
        "buildwww:as": "BUILD_TYPE=as NODE_ENV=production concurrently \"$npm_package_config_webpack --config $npm_package_config_wwwConfig\"",
        "test": "flow && jest",
        "flow": "flow --watch"
    },
    "devDependencies": {
        "add-asset-html-webpack-plugin": "^2.1.2",
        "autoprefixer": "^7.1.4",
        "babel-core": "^6.26.0",
        "babel-eslint": "^7.2.3",
        "babel-jest": "^20.0.3",
        "babel-loader": "^7.1.2",
        "babel-plugin-lodash": "^3.2.11",
        "babel-plugin-module-resolver": "^2.7.1",
        "babel-plugin-transform-class-properties": "^6.24.1",
        "babel-plugin-transform-decorators": "^6.24.1",
        "babel-plugin-transform-decorators-legacy": "^1.3.4",
        "babel-plugin-transform-es2015-classes": "^6.24.1",
        "babel-plugin-transform-runtime": "^6.23.0",
        "babel-preset-env": "^1.6.1",
        "babel-preset-react": "^6.24.1",
        "babel-preset-stage-3": "^6.24.1",
        "bundle-loader": "^0.5.5",
        "concurrently": "^3.5.0",
        "css-loader": "^0.28.4",
        "enzyme": "^2.9.1",
        "eslint": "^3.19.0",
        "eslint-config-airbnb": "^15.1.0",
        "eslint-config-airbnb-base": "^11.3.1",
        "eslint-friendly-formatter": "^3.0.0",
        "eslint-import-resolver-babel-module": "^3.0.0",
        "eslint-import-resolver-webpack": "^0.8.3",
        "eslint-loader": "^1.8.0",
        "eslint-plugin-flowtype": "^2.34.0",
        "eslint-plugin-import": "2.7.0",
        "eslint-plugin-jsx-a11y": "5.1.1",
        "eslint-plugin-react": "^7.1.0",
        "extract-text-webpack-plugin": "^3.0.0",
        "file-loader": "^1.1.5",
        "flow-bin": "0.52.0",
        "happypack": "^4.0.0-beta.5",
        "html-loader": "^0.5.1",
        "html-webpack-plugin": "^2.30.1",
        "inline-manifest-webpack-plugin": "^3.0.1",
        "jest": "^20.0.4",
        "less": "^2.7.2",
        "less-loader": "^4.0.5",
        "lodash-webpack-plugin": "^0.11.4",
        "postcss-loader": "^2.0.6",
        "raw-loader": "^0.5.1",
        "react-test-renderer": "^16.0.0",
        "source-map-loader": "^0.2.1",
        "style-loader": "^0.18.2",
        "url-loader": "^0.6.2",
        "webpack": "^3.8.1",
        "webpack-bundle-analyzer": "^2.9.0",
        "webpack-chunk-hash": "^0.5.0",
        "webpack-dev-server": "^2.9.2",
        "webpack-merge": "^4.1.0",
        "webpack-uglify-parallel": "^0.1.4"
    },
    "dependencies": {
        "axios": "^0.16.2",
        "babel-polyfill": "^6.26.0",
        "babel-standalone": "^6.26.0",
        "console-polyfill": "^0.3.0",
        "core-js": "^2.5.0",
        "date-fns": "^1.28.5",
        "es6-promise": "^4.1.1",
        "history": "^4.7.2",
        "localforage": "^1.5.2",
        "lodash": "^4.17.4",
        "marked": "^0.3.6",
        "mobx": "^3.3.1",
        "mobx-react": "^4.3.3",
        "nprogress": "^0.2.0",
        "polished": "^1.8.1",
        "prismjs": "^1.6.0",
        "prop-types": "^15.5.10",
        "react": "^16.0.0",
        "react-addons-perf": "^15.4.2",
        "react-dom": "^16.0.0",
        "react-hot-loader": "next",
        "react-motion": "^0.5.2",
        "react-router": "^4.2.0",
        "react-router-dom": "^4.2.2",
        "react-router-transition": "^1.1.1",
        "react-tiny-virtual-list": "^2.1.2",
        "shallowequal": "^1.0.2",
        "styled-components": "^2.2.1",
        "webpack-dev-middleware": "^1.12.0",
        "webpack-sources": "^1.0.1",
        "why-did-you-update": "^0.0.8"
    },
    "jest": {
        "globals": {
            "widow": true
        },
        "collectCoverage": true,
        "modulePaths": [
            "<rootDir>/src/"
        ],
        "moduleNameMapper": {
            "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "<rootDir>/flow/__mocks__/fileMock.js",
            "\\.(css)$": "<rootDir>/flow/__mocks__/styleMock.js"
        },
        "setupFiles": [
            "<rootDir>/test/main.js"
        ]
    }
}

[babel-bot]

Comment originally made by @nicolo-ribaudo

useBuiltIns: entry/usage is only supported in version 2, you are using ^1.6.1.

[babel-bot]

Comment originally made by @weizongqi1990

But,i use ^2,i got

/Users/nico/56hello/fronted/master/front-end/node_modules/babel-core/lib/transformation/file/options/option-manager.js:328
[0]         throw e;
[0]         ^
[0]
[0] TypeError: Cannot read property 'loose' of undefined (While processing preset: "/Users/nico/56hello/fronted/master/front-end/node_modules/babel-preset-env/lib/index.js")

[babel-bot]

Comment originally made by @existentialism

@weizongqi1990 babel-preset-env 2.x (really, you should use the latest 7.0-beta.x) requires matching 7.0-beta.x Babel dependencies.

Sorry for the confusion, we're working on making this clearer asap.

[babel-bot]

Comment originally made by @weizongqi1990

@existentialism
Thank you for your reply!