我通常在使用webpack时遇到问题。但是在这种情况下，控制台告诉我，Webpack无法找到core-js模块。在顶部警告中，它显示“我们建议通过corejs选项显式设置您正在使用的core-js版本”。但是如何指定core-js版本？在其他与webpack / babel相关的问题或官方文档中找不到任何提示。
控制台输出
$ npm run build
> jkk-onepager@1.0.0 build /Users/frankwenzel/Repositories/_GitLab/jkk-onepager
> webpack
WARNING: We noticed you're using the `useBuiltIns` option without declaring a core-js version. Currently, we assume version 2.x when no version is passed. Since this default version will likely change in future versions of Babel, we recommend explicitly setting the core-js version you are using via the `corejs` option.
You should also be sure that the version you pass to the `corejs` option matches the version specified in your `package.json`'s `dependencies` section. If it doesn't, you need to run one of the following commands:
npm install --save core-js@2 npm install --save core-js@3
yarn add core-js@2 yarn add core-js@3
@babel/preset-env: `DEBUG` option
Using targets:
{
"android": "4",
"chrome": "29",
"edge": "15",
"firefox": "52",
"ie": "11",
"ios": "7",
"opera": "57",
"safari": "9",
"samsung": "4"
}
Using modules transform: auto
Using plugins:
transform-template-literals { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9" }
transform-literals { "android":"4", "chrome":"29", "firefox":"52", "ie":"11", "ios":"7" }
transform-function-name { "android":"4", "chrome":"29", "edge":"15", "firefox":"52", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-arrow-functions { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-block-scoped-functions { "android":"4", "chrome":"29", "ios":"7", "safari":"9" }
transform-classes { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-object-super { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-shorthand-properties { "android":"4", "chrome":"29", "ie":"11", "ios":"7" }
transform-duplicate-keys { "android":"4", "chrome":"29", "ie":"11", "ios":"7" }
transform-computed-properties { "android":"4", "chrome":"29", "ie":"11", "ios":"7" }
transform-for-of { "android":"4", "chrome":"29", "firefox":"52", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-sticky-regex { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-dotall-regex { "android":"4", "chrome":"29", "edge":"15", "firefox":"52", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-unicode-regex { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-spread { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-parameters { "android":"4", "chrome":"29", "edge":"15", "firefox":"52", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-destructuring { "android":"4", "chrome":"29", "edge":"15", "firefox":"52", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-block-scoping { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-typeof-symbol { "android":"4", "chrome":"29", "ie":"11", "ios":"7" }
transform-new-target { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-regenerator { "android":"4", "chrome":"29", "firefox":"52", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-exponentiation-operator { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-async-to-generator { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
proposal-async-generator-functions { "android":"4", "chrome":"29", "edge":"15", "firefox":"52", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
proposal-object-rest-spread { "android":"4", "chrome":"29", "edge":"15", "firefox":"52", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
proposal-unicode-property-regex { "android":"4", "chrome":"29", "edge":"15", "firefox":"52", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
proposal-json-strings { "android":"4", "chrome":"29", "edge":"15", "firefox":"52", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
proposal-optional-catch-binding { "android":"4", "chrome":"29", "edge":"15", "firefox":"52", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
transform-named-capturing-groups-regex { "android":"4", "chrome":"29", "edge":"15", "firefox":"52", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
Using polyfills with `entry` option:
[/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src/main.js] Replaced @babel/polyfill entries with the following polyfills:
es6.array.copy-within { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "samsung":"4" }
es6.array.fill { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "samsung":"4" }
es6.array.find { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "samsung":"4" }
es6.array.find-index { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "samsung":"4" }
es7.array.flat-map { "android":"4", "chrome":"29", "edge":"15", "firefox":"52", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
es6.array.from { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
es7.array.includes { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
es6.array.iterator { "android":"4", "chrome":"29", "ie":"11", "ios":"7" }
es6.array.of { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "samsung":"4" }
es6.array.sort { "android":"4", "chrome":"29", "ios":"7", "safari":"9", "samsung":"4" }
es6.array.species { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
es6.date.to-json { "ios":"7", "safari":"9" }
es6.date.to-primitive { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
es6.function.has-instance { "android":"4", "chrome":"29", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
es6.function.name { "ie":"11" }
es6.map { "android":"4", "chrome":"29", "firefox":"52", "ie":"11", "ios":"7", "safari":"9", "samsung":"4" }
Hash: 6c65e92d03f5b74daa97
Version: webpack 4.29.6
Time: 2613ms
Built at: 2019-04-01 14:03:40
Asset Size Chunks Chunk Names
bundle.js 118 KiB app [emitted] app
Entrypoint app = bundle.js
[./_assets/js/src/main.js] 24.3 KiB {app} [built]
+ 48 hidden modules
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.array.copy-within' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 1:0-47
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.array.fill' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 2:0-40
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.array.find' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 3:0-40
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.array.find-index' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 4:0-46
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.array.from' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 6:0-40
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.array.iterator' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 8:0-44
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.array.of' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 9:0-38
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.array.sort' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 10:0-40
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.array.species' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 11:0-43
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.date.to-json' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 12:0-42
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.date.to-primitive' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 13:0-47
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.function.has-instance' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 14:0-51
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.function.name' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 15:0-43
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.map' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 16:0-33
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.math.acosh' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 17:0-40
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.math.asinh' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 18:0-40
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/es6.math.atanh' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
@ ./_assets/js/src/main.js 19:0-40
@ ./_assets/js/src/main.js 129:0-42
npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! jkk-onepager@1.0.0 build: `webpack`
npm ERR! Exit status 2
npm ERR!
npm ERR! Failed at the jkk-onepager@1.0.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
package.json
{
"name": "jkk-onepager",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"build": "webpack",
"start": "webpack-dev-server"
},
"repository": {
"type": "git",
"url": "http://10.8.1.1:850/root/jkk-onepager.git"
},
"author": "",
"license": "ISC",
"dependencies": {
"@babel/core": "^7.4.0",
"@babel/polyfill": "^7.4.0",
"@babel/preset-env": "^7.4.2",
"babel-loader": "^8.0.5",
"babel-plugin-syntax-flow": "^6.18.0",
"babel-plugin-transform-class-properties": "^6.24.1",
"babel-plugin-transform-decorators-legacy": "^1.3.5",
"babel-plugin-transform-flow-strip-types": "^6.22.0",
"babel-plugin-transform-object-rest-spread": "^6.26.0",
"babel-polyfill": "^6.26.0",
"babel-preset-es2015": "^6.24.1",
"core-js": "^3.0.0",
"webpack-dev-server": "^3.2.1"
},
"devDependencies": {
"babel-core": "^7.0.0-bridge.0",
"babel-preset-env": "^1.7.0",
"webpack": "^4.29.6",
"webpack-cli": "^3.3.0"
}
}
.babelrc
{
"presets": [
["@babel/preset-env", {
"useBuiltIns": "entry",
"debug": true
}]
]
}
编辑：
经过一些额外的研究，我找到了并尝试过：
webpack --progress --color --watch --display-error-details
ERROR in ./_assets/js/src/main.js
Module not found: Error: Can't resolve 'core-js/modules/web.dom.iterable' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
resolve 'core-js/modules/web.dom.iterable' in '/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src'
Parsed request is a module
using description file: /Users/frankwenzel/Repositories/_GitLab/jkk-onepager/package.json (relative path: ./_assets/js/src)
Field 'browser' doesn't contain a valid alias configuration
resolve as module
/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/src/node_modules doesn't exist or is not a directory
/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/js/node_modules doesn't exist or is not a directory
/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/_assets/node_modules doesn't exist or is not a directory
/Users/frankwenzel/Repositories/_GitLab/node_modules doesn't exist or is not a directory
/Users/frankwenzel/Repositories/node_modules doesn't exist or is not a directory
/Users/frankwenzel/node_modules doesn't exist or is not a directory
/Users/node_modules doesn't exist or is not a directory
/node_modules doesn't exist or is not a directory
looking for modules in /Users/frankwenzel/Repositories/_GitLab/jkk-onepager/node_modules
using description file: /Users/frankwenzel/Repositories/_GitLab/jkk-onepager/package.json (relative path: ./node_modules)
Field 'browser' doesn't contain a valid alias configuration
using description file: /Users/frankwenzel/Repositories/_GitLab/jkk-onepager/node_modules/core-js/package.json (relative path: ./modules/web.dom.iterable)
no extension
Field 'browser' doesn't contain a valid alias configuration
/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/node_modules/core-js/modules/web.dom.iterable doesn't exist
.wasm
Field 'browser' doesn't contain a valid alias configuration
/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/node_modules/core-js/modules/web.dom.iterable.wasm doesn't exist
.mjs
Field 'browser' doesn't contain a valid alias configuration
/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/node_modules/core-js/modules/web.dom.iterable.mjs doesn't exist
.js
Field 'browser' doesn't contain a valid alias configuration
/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/node_modules/core-js/modules/web.dom.iterable.js doesn't exist
.json
Field 'browser' doesn't contain a valid alias configuration
/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/node_modules/core-js/modules/web.dom.iterable.json doesn't exist
as directory
/Users/frankwenzel/Repositories/_GitLab/jkk-onepager/node_modules/core-js/modules/web.dom.iterable doesn't exist