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babel

The compiler for writing next generation JavaScript.

Gitpod ready-to-code

v7 npm Downloads v6 npm Downloads

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  • Giving developer time on the project. (Message us on Twitter or Slack for guidance!)
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Intro

Babel is a tool that helps you write code in the latest version of JavaScript. When your supported environments don't support certain features natively, Babel will help you compile those features down to a supported version.

In

// ES2020 nullish coalescing
function greet(input) {
  return input ?? "Hello world";
}

Out

function greet(input) {
  return input != null ? input : "Hello world";
}

Try it out at our REPL.

FAQ

Who maintains Babel?

Mostly a handful of volunteers, funded by you! Please check out our team page!

Is there a Babel song?

I'm so glad you asked: Hallelujah —— In Praise of Babel by @angus-c, audio version by @swyx. Tweet us your recordings!

Looking for support?

For questions and support please join our Slack Community (you can sign up here for an invite), ask a question on Stack Overflow, or ping us on Twitter.

Where are the docs?

Check out our website: babeljs.io, and report issues/features at babel/website.

Want to report a bug or request a feature?

Please read through our CONTRIBUTING.md and fill out the issue template at babel/issues!

Want to contribute to Babel?

Check out:

Some resources:

How is the repo structured?

The Babel repo is managed as a monorepo that is composed of many npm packages.

License

MIT

babel-upgrade's People

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babel-upgrade's Issues

Incorrect update babel-loader for webpack 1

Webpack: 1.13.2
Node: 8.9.1
npm: 5.6.0

package.json

{
  "devDependencies": {
+   "@babel/core": "7.0.0-beta.39",
+   "@babel/polyfill": "7.0.0-beta.39",
+   "@babel/preset-env": "7.0.0-beta.39",
+   "@babel/preset-react": "7.0.0-beta.39",
+   "@babel/preset-stage-2": "7.0.0-beta.39",
+   "babel-loader": "v8.0.0-beta.0",
-    "babel-core": "6.26.0",
-    "babel-loader": "6.2.5",
-    "babel-polyfill": "6.26.0",
-    "babel-preset-env": "1.6.1",
-    "babel-preset-react": "6.24.1",
-    "babel-preset-stage-2": "6.24.1",
  },
}

.babelrc

 {
   "presets": [
-    ["env", {
-      "targets": {
-        "browsers": ["last 2 versions"]
+    [
+      "@babel/preset-env",
+      {
+        "targets": {
+          "browsers": [
+            "last 2 versions"
+          ]
+        }
       }
-    }],
-    "react",
-    "stage-2"
+    ],
+    "@babel/preset-react",
+    "@babel/preset-stage-2"
   ]
 }

Error in console:

ERROR in multi app
Module not found: Error: Cannot resolve module 'babel-polyfill' in /home/andrew/w/projects/m-daiquiri-ui
 @ multi app

ERROR in ./core/src/index.jsx
Module build failed: TypeError: fileSystem.statSync is not a function
    at module.exports (/home/andrew/w/projects/m-daiquiri-ui/node_modules/babel-loader/lib/utils/exists.js:5:25)
    at find (/home/andrew/w/projects/m-daiquiri-ui/node_modules/babel-loader/lib/resolve-rc.js:12:9)
    at Object.module.exports (/home/andrew/w/projects/m-daiquiri-ui/node_modules/babel-loader/lib/index.js:121:132)
 @ multi app

babel-upgrade downgraded babel-loader

Hi,

I had babel-loader version higher than babel-uprade suggested me, here is what happened:

-  "babel-loader": "^8.0.0-beta.3",
+  "babel-loader": "^8.0.0-beta.0",

Change Stage X presets to the individual plugins?

Ref babel/babel#7770

Not sure how automatic this should be. People should decide what plugins to opt-in to anyway? Either way if we remove them we'll have a message on what to upgrade? I guess it's weird on the tooling side because the output would change over time (maybe needs to have a date, or to say it's current as of x).

plugins aren't added to package.json

babel-upgrade explodes all of the stage presets that we had into the individual plugins, which is great - but it doesn't add these plugins to our package.json for installation so we had to do this manually. Is this expected, or should it have inserted the plugins into package.json itself?

babel-upgrade output,

🙌  Thanks for trying out https://github.com/babel/babel-upgrade!

Updating .babelrc config at .babelrc
Index: .babelrc
===================================================================
--- .babelrc	Before Upgrade
+++ .babelrc	After Upgrade
@@ -1,28 +1,69 @@
 {
   "presets": [
     [
-      "es2015",
+      "@babel/preset-env",
       {
         "modules": false
       }
     ],
-    "es2016",
-    "es2017",
-    "react",
-    "stage-2"
+    "@babel/preset-env",
+    "@babel/preset-env",
+    "@babel/preset-react",
+    "@babel/preset-flow"
   ],
   "plugins": [
     "emotion",
-    "transform-async-to-generator",
-    "react-hot-loader/babel"
+    "@babel/plugin-transform-async-to-generator",
+    "react-hot-loader/babel",
+    "@babel/plugin-syntax-dynamic-import",
+    "@babel/plugin-syntax-import-meta",
+    "@babel/plugin-proposal-class-properties",
+    "@babel/plugin-proposal-json-strings",
+    [
+      "@babel/plugin-proposal-decorators",
+      {
+        "legacy": true
+      }
+    ],
+    "@babel/plugin-proposal-function-sent",
+    "@babel/plugin-proposal-export-namespace-from",
+    "@babel/plugin-proposal-numeric-separator",
+    "@babel/plugin-proposal-throw-expressions"
   ],
   "env": {
     "test": {
       "presets": [
-        "es2015",
-        "react",
-        "stage-0"
+        "@babel/preset-env",
+        "@babel/preset-react"
+      ],
+      "plugins": [
+        "@babel/plugin-syntax-dynamic-import",
+        "@babel/plugin-syntax-import-meta",
+        "@babel/plugin-proposal-class-properties",
+        "@babel/plugin-proposal-json-strings",
+        [
+          "@babel/plugin-proposal-decorators",
+          {
+            "legacy": true
+          }
+        ],
+        "@babel/plugin-proposal-function-sent",
+        "@babel/plugin-proposal-export-namespace-from",
+        "@babel/plugin-proposal-numeric-separator",
+        "@babel/plugin-proposal-throw-expressions",
+        "@babel/plugin-proposal-export-default-from",
+        "@babel/plugin-proposal-logical-assignment-operators",
+        "@babel/plugin-proposal-optional-chaining",
+        [
+          "@babel/plugin-proposal-pipeline-operator",
+          {
+            "proposal": "minimal"
+          }
+        ],
+        "@babel/plugin-proposal-nullish-coalescing-operator",
+        "@babel/plugin-proposal-do-expressions",
+        "@babel/plugin-proposal-function-bind"
       ]
     }
   }
 }
\ No newline at end of file


Updating closest package.json dependencies
Index: /Users/camron/src/lodgetools/inntender/package.json
===================================================================
--- /Users/camron/src/lodgetools/inntender/package.json	Before Upgrade
+++ /Users/camron/src/lodgetools/inntender/package.json	After Upgrade
@@ -27,15 +27,15 @@
     }
   },
   "proxy": "https://inntender.dev",
   "dependencies": {
+    "@babel/core": "^7.0.0",
+    "@babel/plugin-transform-async-to-generator": "^7.0.0",
+    "@babel/polyfill": "^7.0.0",
+    "@babel/preset-react": "^7.0.0",
     "autoprefixer": "^8.4.1",
     "axios": "^0.18.0",
-    "babel-core": "^6.26.3",
     "babel-plugin-emotion": "^9.1.2",
-    "babel-plugin-transform-async-to-generator": "^6.24.1",
-    "babel-polyfill": "^6.26.0",
-    "babel-preset-react": "^6.24.1",
     "bootstrap": "3.3.7",
     "css-loader": "^0.28.11",
     "cssnano": "^3.10.0",
     "csso": "^3.1.1",
@@ -61,24 +61,24 @@
     "redux": "^4.0.0",
     "style-loader": "^0.21.0"
   },
   "devDependencies": {
+    "@babel/cli": "^7.0.0",
+    "@babel/core": "^7.0.0",
+    "@babel/preset-env": "^7.0.0",
+    "@babel/preset-flow": "^7.0.0",
     "@kadira/storybook-addons": "^1.6.1",
     "@storybook/addon-info": "^3.4.3",
     "@storybook/addon-knobs": "^3.4.3",
     "@storybook/addon-options": "^3.4.3",
     "@storybook/react": "^3.4.3",
     "axios-mock-adapter": "^1.15.0",
-    "babel-cli": "^6.26.0",
-    "babel-eslint": "^8.2.3",
-    "babel-jest": "^22.4.3",
-    "babel-loader": "^7.1.4",
+    "babel-core": "^7.0.0-bridge.0",
+    "babel-eslint": "^9.0.0",
+    "babel-jest": "^23.4.2",
+    "babel-loader": "^8.0.0",
     "babel-minify": "^0.4.3",
     "babel-plugin-add-module-exports": "^0.2.1",
-    "babel-preset-es2015": "^6.24.1",
-    "babel-preset-es2016": "^6.24.1",
-    "babel-preset-es2017": "^6.24.1",
-    "babel-preset-flow": "^6.23.0",
     "compression-webpack-plugin": "^1.1.11",
     "eslint": "^4.19.1",
     "eslint-config-prettier": "^2.4.0",
     "eslint-plugin-flowtype": "^2.46.3",


Tracking: handling JavaScript files

Tracked in the readme already but made an issue since not many people read the readme

We should use jscodeshift/babel-codemod for this.

  • Upgrade a js config: .babelrc.js, babel.config.js, a preset written in JS, or a babel config written via @babel/core options or babel-loader.
  • Upgrade any tools that use Babel directly
    • import statements like babel-types to @babel/types
    • API removals/deprecations/changes

After upgrade to Babel7, I see Cannot find module '@babel/runtime-corejs2/core-js/reflect/construct'

Current behavior

After upgrading from babel 6 to 7, Error occurred in PR deploy phrase. It was working normally in local build.
This is what I see on pm2 log on K8s

Cannot find module '@babel/runtime-corejs2/core-js/reflect/construct'
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)
at Module.Hook._require.Module.require (/home/y/lib/node_modules/pm2/node_modules/require-in-the-middle/index.js:61:29)
at require (internal/modules/cjs/helpers.js:25:18)
at Object.<anonymous> (/home/y/share/node/manhattan_app/transpile/lib/errorHelper.js:3:26)
at Module._compile (internal/modules/cjs/loader.js:778:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
at Module.require (internal/modules/cjs/loader.js:692:17)

This is the excerpt from package.json

 "devDependencies": {
    "@babel/cli": "^7.0.0",
    "@babel/core": "^7.0.0",
    "@babel/node": "^7.0.0",
    "@babel/plugin-proposal-class-properties": "^7.0.0",
    "@babel/plugin-proposal-decorators": "^7.0.0",
    "@babel/plugin-proposal-do-expressions": "^7.0.0",
    "@babel/plugin-proposal-export-default-from": "^7.0.0",
    "@babel/plugin-proposal-export-namespace-from": "^7.0.0",
    "@babel/plugin-proposal-function-bind": "^7.0.0",
    "@babel/plugin-proposal-function-sent": "^7.0.0",
    "@babel/plugin-proposal-json-strings": "^7.0.0",
    "@babel/plugin-proposal-logical-assignment-operators": "^7.0.0",
    "@babel/plugin-proposal-nullish-coalescing-operator": "^7.0.0",
    "@babel/plugin-proposal-numeric-separator": "^7.0.0",
    "@babel/plugin-proposal-object-rest-spread": "^7.0.0",
    "@babel/plugin-proposal-optional-chaining": "^7.0.0",
    "@babel/plugin-proposal-pipeline-operator": "^7.0.0",
    "@babel/plugin-proposal-throw-expressions": "^7.0.0",
    "@babel/plugin-syntax-dynamic-import": "^7.0.0",
    "@babel/plugin-syntax-import-meta": "^7.0.0",
    "@babel/plugin-transform-computed-properties": "^7.0.0",
    "@babel/plugin-transform-modules-commonjs": "^7.13.8",
    "@babel/plugin-transform-react-constant-elements": "^7.0.0",
    "@babel/plugin-transform-react-inline-elements": "^7.0.0",
    "@babel/plugin-transform-runtime": "^7.0.0",
    "@babel/preset-env": "^7.0.0",
    "@babel/preset-react": "^7.0.0",
    "@babel/register": "^7.0.0",
    "@babel/runtime-corejs2": "7.12.5",
    "autoprefixer": "^8.6.5",
    "babel-eslint": "^10.0.2",
    "babel-jest": "^24.8.0",
    "babel-loader": "^8.0.0",
    "babel-plugin-css-modules-transform": "^1.6.2",
    "babel-plugin-import": "^1.12.2",
    "babel-plugin-lodash": "^3.3.4",
    "babel-plugin-rewire-exports": "^0.5.0",
    "clean-css-cli": "^4.1.6",
    "component_ec_nodejs_test_util": "^1.0.6",
    "css-loader": "^3.6.0",
    "deep-freeze": "0.0.1",
    "ectest-accounts": "^0.1.1656",
    "enzyme": "^3.8.0",
    "enzyme-adapter-react-16": "^1.7.1",
    "eslint": "^6.1.0",
    "eslint-config-prettier": "^6.7.0",
    "eslint-plugin-codeceptjs": "^1.0.0",
    "eslint-plugin-json": "^1.4.0",
    "eslint-plugin-prettier": "^3.1.0",
    "eslint-plugin-react": "^7.14.3",
    "eslint-plugin-react-hooks": "^1.6.1",
    "file-loader": "^6.0.0",
    "jest": "^26.6.3",
    "jest-junit": "^3.0.0",
    "mini-css-extract-plugin": "^0.10.0",
    "nodemon": "1.17.3",
    "postcss": "^7.0.32",
    "postcss-easy-import": "^3.0.0",
    "postcss-functions": "^2.1.1",
    "postcss-import": "^10.0.0",
    "postcss-loader": "^2.0.6",
    "postcss-scss": "^1.0.2",
    "postcss-simple-vars": "^4.0.0",
    "pre-commit": "^1.2.2",
    "precss": "^2.0.0",
    "prettier": "^1.19.1",
    "react-test-renderer": "^16.6.3",
    "redux-mock-store": "^1.5.3",
    "request-promise": "^4.2.2",
    "requestretry": "^3.1.0",
    "rimraf": "2.4.3",
    "saucelabs": "^1.5.0",
    "sd-s3-assets-deploy": "^0.4.1",
    "style-loader": "^1.2.1",
    "url-loader": "^0.6.2",
    "wait-for-expect": "^1.1.1",
    "wait-on": "^2.0.2",
    "wdio-screenshot": "^0.6.0",
    "webdriverio": "^4.13.1",
    "webpack": "^4.27.0",
    "webpack-bundle-analyzer": "^3.0.3",
    "webpack-cli": "^3.1.2",
    "webpack-dev-middleware": "^3.4.0",
    "webpack-hot-middleware": "^2.24.3",
    "webpack-manifest-plugin": "^2.0.4"
  },

Babel Configuration (babel.config.js, .babelrc, package.json#babel, cli command, .eslintrc)

  • Filename: babelrc
{
    "presets": [
      "@babel/preset-react",
      [
        "@babel/preset-env",
        {
          "targets": {
            "node": "current",
            "browsers": [
              "ie >= 11"
            ]
          }
        }
      ]
    ],
    "plugins": [
      [
        "css-modules-transform",
        {
          "generateScopedName": "[local]__[hash:base64:5]",
          "extensions": [
            ".css"
          ],
          "processorOpts": "./babel/processor.options.js"
        }
      ],
      [
        "@babel/plugin-transform-runtime",
        {
          "corejs": 2,
          "regenerator": true
        }
      ],
      "@babel/plugin-transform-computed-properties",
      "@babel/plugin-proposal-object-rest-spread",
      "@babel/plugin-proposal-class-properties",
      "@babel/plugin-transform-react-inline-elements",
      "@babel/plugin-transform-react-constant-elements",
      "lodash",
      "@babel/plugin-syntax-dynamic-import",
      "@babel/plugin-syntax-import-meta",
      "@babel/plugin-proposal-json-strings",
      [
        "@babel/plugin-proposal-decorators",
        {
          "legacy": true
        }
      ],
      "@babel/plugin-proposal-function-sent",
      "@babel/plugin-proposal-export-namespace-from",
      "@babel/plugin-proposal-numeric-separator",
      "@babel/plugin-proposal-throw-expressions",
      "@babel/plugin-proposal-export-default-from",
      "@babel/plugin-proposal-logical-assignment-operators",
      "@babel/plugin-proposal-optional-chaining",
      [
        "@babel/plugin-proposal-pipeline-operator",
        {
          "proposal": "minimal"
        }
      ],
      "@babel/plugin-proposal-nullish-coalescing-operator",
      "@babel/plugin-proposal-do-expressions",
      "@babel/plugin-proposal-function-bind"
    ],
    "sourceType": "unambiguous"
  }  

Environment

  • Babel version(s): [v7]
  • Node/npm version: [e.g. Node 10.21.0/npm 6.14.4]
  • OS: [macOS 10.15.7]
  • Monorepo: [no]
  • How you are using Babel: [webpack]

I've been banging my head for days to try to fix this. Please suggest how to fix this problem. Thank you.

Did not upgrade .babelrc file

From what I can gather from the README, this tool should upgrade my .babelrc file too, right?

I was running babel 6.x, it updated my package.json with dozens of "@babel/...": "7.0.0-beta.39" lines but didn't touch my .babelrc file.

Did it fail because I'm using json5 syntax perhaps? Here's my .babelrc file:

{
  // babel uses json5 to parse this file; comments *are* allowed (https://github.com/kadirahq/react-storybook/issues/95#issuecomment-230488360)

  "presets": ['@babel/preset-react'],
  "plugins": [
    // 'add-module-exports',
    'syntax-flow',
    'syntax-trailing-function-commas',

    'check-es2015-constants',

    'transform-flow-strip-types',
    'transform-es3-member-expression-literals', // http://stackoverflow.com/a/33513000/65387
    'transform-es3-property-literals',
    'transform-es5-property-mutators',
//    ['transform-es2015-modules-commonjs', {loose: true}], // https://babeljs.slack.com/archives/discussion/p1455667909000424 // Webpack 2 should have modules disabled
    'transform-class-constructor-call',
    'transform-class-properties',
    'transform-decorators',
    'transform-export-extensions',
    'transform-object-rest-spread',
    'transform-exponentiation-operator',
    'transform-es2015-arrow-functions',
    'transform-es2015-block-scoped-functions',
    'transform-es2015-block-scoping',
    ['transform-es2015-classes', {loose: true}], // https://gist.github.com/zertosh/4f818163e4d68d58c0fa, https://github.com/babel/babelify/issues/133
    // 'transform-proto-to-assign',
    'transform-es2015-computed-properties',
    'transform-es2015-destructuring',
    'transform-es2015-for-of',
    'transform-es2015-function-name',
    'transform-es2015-literals',
    'transform-es2015-object-super',
    'transform-es2015-parameters',
    'transform-es2015-shorthand-properties',
    'transform-es2015-spread',
    'transform-es2015-sticky-regex',
    'transform-es2015-template-literals',
    'transform-es2015-typeof-symbol',
    'transform-es2015-unicode-regex',
    ['transform-runtime', {"polyfill": true, "regenerator": false}],

    // http://stackoverflow.com/a/28709165/65387
    // 'syntax-async-functions',
    // ['fast-async',{
    //     compiler: {
    //         promises: true,
    //         generators: false
    //     }
    // }],
    // 'transform-async-to-generator',
    // 'transform-regenerator',

    // ['transform-async-to-module-method', {
    //     module: 'bluebird',
    //     method: 'coroutine'
    // }],
    //
    // // 'transform-async-to-generator',
    // ['transform-regenerator', { // http://babeljs.io/docs/plugins/transform-regenerator/
    //     asyncGenerators: false, // true by default
    //     generators: true, // true by default
    //     async: false // true by default
    // }],
  ],
  "env": {
    "production": {
      "plugins": [
        "transform-react-remove-prop-types",
        "transform-react-inline-elements",
        "transform-react-constant-elements"
      ]
    }
  },
  "compact": false
}

Jest 24 dropped support for babel 6

Jest 24 has been released and no longer supports babel 6. https://jestjs.io/docs/en/getting-started#babel-6

Trying to run babel-upgrade against a package.json with Jest 24 tries to downgrade it and add babel-core back to the package.json.

$ npx babel-upgrade
npx: installed 192 in 7.723s
🙌  Thanks for trying out https://github.com/babel/babel-upgrade!

Updating closest package.json dependencies
Index: /Users/rpierce/source/component-library/package.json
===================================================================
--- /Users/rpierce/source/component-library/package.json	Before Upgrade
+++ /Users/rpierce/source/component-library/package.json	After Upgrade
@@ -59,10 +59,11 @@
     "@storybook/react": "^4.1.13",
     "@types/node": "^8.10.40",
     "apollo-cache-inmemory": "^1.4.3",
     "apollo-client": "^2.4.13",
+    "babel-core": "^7.0.0-bridge.0",
     "babel-eslint": "^10.0.1",
-    "babel-jest": "^24.1.0",
+    "babel-jest": "^23.4.2",
     "babel-loader": "^8.0.5",
     "babel-plugin-inline-react-svg": "^1.0.1",
     "browserslist": "^4.4.1",
     "caniuse-db": "^1.0.30000939",

This seems to be the offending code.

// babel-bridge is needed for Jest, or for when a project is using Webpack v1
// and babel-loader.
// https://github.com/babel/babel-upgrade/issues/29
// https://github.com/babel/babel-loader/issues/505
if (
(dependencies['jest'] || dependencies['jest-cli'] || (depsWebpack1 && dependencies['babel-loader'])) &&
!dependencies['babel-core']
) {
dependencies['babel-core'] = '^7.0.0-bridge.0';
}
if (dependencies['jest'] || dependencies['jest-cli']) {
dependencies['babel-jest'] = '^23.4.2';
}

Error when running babel-upgrade

When I run babel-upgrade, I get the following error. Can you help me understand how to solve this?

<--- Last few GCs --->

[14537:0x104800000]   166128 ms: Mark-sweep 1170.0 (1449.9) -> 1169.9 (1450.9) MB, 533.7 / 0.0 ms  allocation failure GC in old space requested
[14537:0x104800000]   166712 ms: Mark-sweep 1169.9 (1450.9) -> 1169.9 (1408.4) MB, 584.6 / 0.0 ms  last resort GC in old space requested
[14537:0x104800000]   167252 ms: Mark-sweep 1169.9 (1408.4) -> 1169.9 (1399.4) MB, 539.7 / 0.0 ms  last resort GC in old space requested


<--- JS stacktrace --->

==== JS stack trace =========================================

Security context: 0x3a41d425529 <JSObject>
    1: set(this=0x3a4c0417d69 <Map map = 0x3a4d43048d9>,0x3a424538509 <String[132]: Library/Containers/com.apple.iPhoto/Data/Pictures/iPhoto Library.migratedphotolibrary/Database/Places/29MgKImSQ9W2119InNuK%Q.applace>,0x3a40fd822d1 <undefined>)
    2: createIndexRecord [/usr/local/lib/node_modules/babel-upgrade/node_modules/fast-glob/out/providers/filters/entry.js:~45] [pc=0x319e5e4a2ca](this=0x3...

FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory
 1: node::Abort() [/usr/local/bin/node]
 2: node::OnFatalError(char const*, char const*) [/usr/local/bin/node]
 3: v8::Utils::ReportOOMFailure(char const*, bool) [/usr/local/bin/node]
 4: v8::internal::V8::FatalProcessOutOfMemory(char const*, bool) [/usr/local/bin/node]
 5: v8::internal::Factory::NewFixedArray(int, v8::internal::PretenureFlag) [/usr/local/bin/node]
 6: v8::internal::OrderedHashTable<v8::internal::OrderedHashMap, 2>::Allocate(v8::internal::Isolate*, int, v8::internal::PretenureFlag) [/usr/local/bin/node]
 7: v8::internal::OrderedHashTable<v8::internal::OrderedHashMap, 2>::Rehash(v8::internal::Handle<v8::internal::OrderedHashMap>, int) [/usr/local/bin/node]
 8: v8::internal::Runtime_MapGrow(int, v8::internal::Object**, v8::internal::Isolate*) [/usr/local/bin/node]
 9: 0x319e5d042fd
10: 0x319e5db251e
Abort trap: 6

3rd party plugins

  • May need to add a warning on any 3rd party plugins since they might not be compatible

Add integrations/other tools

packages that are used outside of the monorepo

Examples:

  • update thebabel-loader version
  • update mocha: "test": "mocha --compilers js:babel-register", -> "test": "mocha --compilers js:@babel/register",

Upgrade failed

I tried to use babel-upgrade to upgrade my project from Babel 6 to Babel 7.

I've used the command:

 babel-upgrade --write --install

This is how it affected my package.json dependencies:

-    "babel-cli": "~6.26.0",
-    "babel-core": "~6.26.0",
-    "babel-eslint": "~8.0.3",
-    "babel-loader": "^7.1.4",
-    "babel-plugin-transform-object-rest-spread": "6.26.0",
-    "babel-polyfill": "~6.26.0",
-    "babel-preset-es2015": "^6.24.1",
-    "babel-register": "^6.26.0",

+    "@babel/cli": "^7.0.0",
+    "@babel/core": "^7.0.0",
+    "@babel/plugin-proposal-object-rest-spread": "^7.0.0",
+    "@babel/polyfill": "^7.0.0",
+    "@babel/preset-env": "^7.0.0",
+    "@babel/register": "^7.0.0",
+    "babel-eslint": "^9.0.0",
+    "babel-loader": "^8.0.0",

However my build is now broken and I get the following errors:

ERROR in ./src/app/index.js
Module build failed (from ./node_modules/babel-loader/lib/index.js):
ReferenceError: Unknown plugin "@babel/plugin-proposal-object-rest-spread" specified in "/path/to/myapp/.babelrc" at 0, attempted to resolve relative to "/path/to/myapp"
ERROR in ./src/app/index.js
Module build failed (from ./node_modules/babel-loader/lib/index.js):
Error: Cannot find module 'babel-preset-es2015' from '/path/to/myapp'

ERROR in multi babel-polyfill ./src/client/index Module not found: Error: Can't resolve 'babel' in 'C:\Users\messi\New folder' @ multi babel-polyfill ./src/client/index main[1]

I am getting this error on build:
**Generating minified bundle for production via Webpack. This will take a moment... (node:117912) DeprecationWarning: Tapable.plugin is deprecated. Use new API on .hooks` instead
(node:117912) DeprecationWarning: Chunk.mapModules: Use Array.from(chunk.modulesIterable, fn) instead
Webpack stats: Hash: 2563da8cbef0bd4e0876
Version: webpack 4.20.2
Time: 5557ms
Built at: 2018-10-04 14:32:18
Asset Size Chunks Chunk Names
main.1104bafcd2688cdd4861.js 88.1 KiB 0 main
Entrypoint main = main.1104bafcd2688cdd4861.js
[90] (webpack)/buildin/global.js 509 bytes {0} [built]
[109] ./node_modules/core-js/modules/es6.regexp.flags.js 201 bytes {0} [built]
[112] ./node_modules/core-js/modules/es6.map.js 642 bytes {0} [built]
[114] ./node_modules/core-js/modules/es6.set.js 481 bytes {0} [built]
[115] ./node_modules/core-js/modules/es6.weak-map.js 1.92 KiB {0} [built]
[125] multi babel-polyfill ./src/client/index 40 bytes {0} [built]
[126] ./node_modules/babel-polyfill/lib/index.js 833 bytes {0} [built]
[127] ./node_modules/core-js/shim.js 7.99 KiB {0} [built]
[164] ./node_modules/core-js/modules/es6.number.parse-int.js 221 bytes {0} [built]
[216] ./node_modules/core-js/modules/es6.array.sort.js 643 bytes {0} [built]
[320] ./node_modules/core-js/modules/es7.observable.js 5.39 KiB {0} [built]
[321] ./node_modules/core-js/modules/web.timers.js 754 bytes {0} [built]
[322] ./node_modules/core-js/modules/web.immediate.js 162 bytes {0} [built]
[324] ./node_modules/regenerator-runtime/runtime.js 23.9 KiB {0} [built]
[325] ./node_modules/core-js/fn/regexp/escape.js 108 bytes {0} [built]
+ 313 hidden modules

WARNING in main.1104bafcd2688cdd4861.js contains invalid source map

ERROR in multi babel-polyfill ./src/client/index
Module not found: Error: Can't resolve 'babel' in 'C:\Users\rdodle\New folder'
@ multi babel-polyfill ./src/client/index main[1]
Child html-webpack-plugin for "index.html":
Asset Size Chunks Chunk Names
index.html 534 KiB 0
Entrypoint undefined = index.html
[0] ./node_modules/html-webpack-plugin/lib/loader.js!./src/client/index.ejs 2.1 KiB {0} [built]
[1] ./node_modules/lodash/lodash.js 527 KiB {0} [built]
[2] (webpack)/buildin/global.js 509 bytes {0} [built]
[3] (webpack)/buildin/module.js 519 bytes {0} [built]
Your app is compiled in production mode in /dist. It's ready to roll!`**

My Webpack.config.prod.js

// For info about this file refer to webpack and webpack-hot-middleware documentation
// For info on how we're generating bundles with hashed filenames for cache busting: https://medium.com/@okonetchnikov/long-term-caching-of-static-assets-with-webpack-1ecb139adb95#.w99i89nsz
import webpack from 'webpack';
import path from 'path';
// import ExtractTextPlugin from 'extract-text-webpack-plugin';
import WebpackMd5Hash from 'webpack-md5-hash';
import HtmlWebpackPlugin from 'html-webpack-plugin';
import jsonImporter from 'node-sass-json-importer';
if (!global._babelPolyfill) {
require('babel-polyfill');
}
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const ExtractTextPlugin = require("extract-text-webpack-plugin");

const GLOBALS = {
'process.env.NODE_ENV': JSON.stringify('production'),
DEV: false
};

export default {
mode:"production",
// debug: true,
devtool: 'source-map', // more info:https://webpack.github.io/docs/build-performance.html#sourcemaps and https://webpack.github.io/docs/configuration.html#devtool
// noInfo: true, // set to false to see a list of every file being bundled.
entry: [
'babel-polyfill',
'./src/client/index'
],
output:{
path: path.resolve(__dirname, "dist"), // string
// the target directory for all output files
// must be an absolute path (use the Node.js path module)
filename: '[name].[chunkhash].js', // string // the filename template for entry chunks
publicPath: "/" // string // the url to the output directory resolved relative to the HTML page
},
target: 'web', // necessary per https://webpack.github.io/docs/testing.html#compile-and-test
// output: {
// path: ${__dirname}/dist,
// publicPath: '/',
// filename: '[name].[chunkhash].js'
// },
resolve: {
alias: {
'webworkify': 'webworkify-webpack'
}
},
plugins: [
new webpack.LoaderOptionsPlugin({
debug: true
}),
// Hash the files using MD5 so that their names change when the content changes.
new WebpackMd5Hash(),

// Optimize the order that inspiration are bundled. This assures the hash is deterministic.
new webpack.optimize.OccurrenceOrderPlugin(),

// Tells React to build in prod mode. https://facebook.github.io/react/downloads.html
// --optimize-dedupe resp. new webpack.optimize.DedupePlugin(GLOBALS),

// Generate an external css file with a hash in the filename
new ExtractTextPlugin('[name].[contenthash].css'),

// Generate HTML file that contains references to generated bundles. See here for how this works: https://github.com/ampedandwired/html-webpack-plugin#basic-usage
new HtmlWebpackPlugin({
  template: 'src/client/index.ejs',
  minify: {
    removeComments: true,
    collapseWhitespace: true,
    removeRedundantAttributes: true,
    useShortDoctype: true,
    removeEmptyAttributes: true,
    removeStyleLinkTypeAttributes: true,
    keepClosingSlash: true,
    minifyJS: true,
    minifyCSS: true,
    minifyURLs: true
  },
  inject: true
  // Note that you can add custom options here if you need to handle other custom logic in index.html
}),

// Eliminate duplicate packages when generating bundle
// new webpack.optimize.DedupePlugin(),

// Minify JS
new UglifyJsPlugin()

],
module: {
// configuration regarding modules
rules: [
{
test: /.scss$/,
use: [
// apply multiple loaders and options
"sassLoader",
{
loader: "sassLoader",
options: {
importer: jsonImporter
}
}
]
},
{
test: /.js$/,
include: path.join(__dirname, 'src'),
use: "babel"
},
{
test: /webworkify.+.js$/,
include: path.resolve(__dirname, 'node_modules/webworkify/index.js'),
use: 'worker'
},
{
test: /.eot(?v=\d+.\d+.\d+)?$/,
use: 'file'
},
{
test: /.woff(2)?(?v=[0-9].[0-9].[0-9])?$/,
use: "url-loader?limit=10000&mimetype=application/font-woff"
},
{
test: /.[ot]tf(?v=\d+.\d+.\d+)?$/,
use: 'url?limit=10000&mimetype=application/octet-stream&name=[name].[ext]'
},
{
test: /.svg(?v=\d+.\d+.\d+)?$/,
use: 'file-loader?limit=10000&mimetype=image/svg+xml'},
{
test: /.(jpe?g|png|gif)$/i,
use: ['file']},
{
test: /.ico$/,
use: 'file-loader?name=[name].[ext]'},
{
test: /(.css|.scss)$/,
use: ExtractTextPlugin.extract('css?sourceMap!postcss!resolve-url-loader!sass?sourceMap')
},
{
test: /.json$/,
use: 'json'
},
{
enforce:'post',
include: /node_modules/mapbox-gl/,
loader: 'transform',
query: 'brfs'
}
]
}
};

@babel/core was added twice into package.json

I was trying to upgrade from "babel-core": "^6.26.32".
npx babel-upgrade --write added "@babel/core": "^7.0.0" into both devDependencies and dependencies.

Is that intended? Shouldn't that add only under devDependencies?

Various Node Versions Support

This is probably in the early stages, so I apologize if this issue is premature. From the documentation, it looks like the intent is to support node 4 <=, but currently isn't transpiled down to support Node 4.

Node 4 & 5 (no destructuring)

/bin/babel-upgrade
const { isAcceptedNodeVersion, writePackageJSON, writeBabelRC } = require("../src");
      ^
SyntaxError: Unexpected token {

Node 6 (no async)

/src/index.js:59
async function writePackageJSON() {
      ^^^^^^^^
SyntaxError: Unexpected token function

Node 7 (no trailing/last commas)

/src/packageData.js:243
);
^
SyntaxError: Unexpected token )

Otherwise, everything has worked great in node 8 & 9 .

Globby finds files in lerna packages node_modules

In a lerna monorepo the root's node_modules will be ignored but not node_modules from the packages. Is this intended behavior?

I am using my babel6 test repo https://github.com/Raigen/babel6-tmp

globby(['**/.babelrc', '!./node_modules/**'])

[ 'packages/pck1/.babelrc',
  'packages/pck1/node_modules/pck2/.babelrc',
  'packages/pck2/.babelrc' ]

With this pattern it works as I would expect it.

globby(['**/.babelrc', '!**/node_modules/**'])

[ 'packages/pck1/.babelrc', 'packages/pck2/.babelrc' ]

Especially for the package.json this becomes a long list when dependencies are already installed via lerna bootstrap when I run npx babel-upgrade in the repo.
This does also caused me problems in our main project. I had a dist directory with copied node_modules still lying around and that was why babel-upgrade did not updated the .babelrc, because it found a lot of package.json and it does not update .babelrc when more than one package.json is found.

Duplicated plugin

After run babel-upgrade, it create duplicate @babel/plugin-syntax-dynamic-import in .babelrc.

screen shot 2018-08-29 at 3 32 19 pm

Version: 0.0.23

Name of unknown plugin with options is changed

A plugin that is unknown to babel-upgrade (e.g. lodash/babel-plugin-lodash) will be renamed to babel-plugin-lodash when it it's a plugin with options (an array) but will not be changed when it is a simple plugin.

 {
   "presets": [
-    "react",
+    "@babel/preset-react",
     [
-      "env",
+      "@babel/preset-env",
       {
         "targets": {
           "browsers": [
@@ -21,15 +21,15 @@
   ],
   "plugins": [
     "dynamic-import-node",
-    "transform-class-properties",
-    "transform-object-rest-spread",
-    "syntax-dynamic-import"
+    "@babel/plugin-proposal-class-properties",
+    "@babel/plugin-proposal-object-rest-spread",
+    "@babel/plugin-syntax-dynamic-import"
   ],
   "env": {
     "production": {
       "plugins": [
         [
-          "lodash",
+          "babel-plugin-lodash",
           {
             "workaround": "https://github.com/facebook/jest/issues/3959",
             "reason": "https://github.com/istanbuljs/babel-plugin-istanbul/issues/116"
@@ -38,7 +38,9 @@
       ]
     },
     "development": {
-      "plugins": ["lodash"]
+      "plugins": [
+        "lodash"
+      ]
     }
   }
 }

I think it is because the name of the plugin is changed here

plugin[0] = `babel-plugin-${plugin[0]}`;

https://github.com/babel/babel-upgrade/blob/master/src/upgradeConfig.js#L53-L56

babel-upgrade is broken if you have spaces in user folder.

Hello,
I have a space in my user folder name :

C:\Development\test\onsenui-vue-cordova-test > npx babel-upgrade
Error: EPERM: operation not permitted, mkdir 'C:\Users\xarkam'

The real folder is C:\Users\xarkam xarkam\

Thanks for fix it.

Babel Upgrade Online

babel-upgrade-online

A tiny editor for upgrading Babel versions (to v7)

Online - Source

Motivation

aside: This issue reminds me that we should also make a website for this where you can copy paste or even drag/drop your config/package.json and it does the same thing as this tool. Maybe that could be useful too

#41 (comment)

Tracking: Tools that use `@babel/core` as a dep

Writing down if tools are converted/what we need to do. Tracking date added to the list too.

Apps

Option to dry run

Really useful tool! I think there should be a dry run option just to see what changes the tool will generate before applying them.

I would like to contribute on this, if you do consider such an option

Thanks,
Faizaan.

Need logging to explain changes to the plugins spec

Basically people are going to complain because the output from babel after updating may be larger than before because the defaults are spec behavior.

  • If they use the plugin explicitly, we can opt-into "loose" for them
  • If they don't, we just need to warn that the default is "spec" or "loose", etc.

Example:
-template-literals - default was previously "spec" -> 'a' + b -> "a".concat(b)

"Integration" Testing: Tracking Successes

Looking for projects with .babelrc on github. Then run the command and check tests!

  • koliseoapi/react-forms#2
    • es2015 -> env
    • package renames
    • dep updates
    • add @babel/core
    • rewrite babel-register in npm scripts
  • gaearon/react-side-effect#44
    • modify mocha.opts
  • https://github.com/jamiebuilds/react-loadable
    • question: should we handle babel plugins that aren't used? is it possible to even know that? skip for now
    • if a config has loose in it, then even if a plugin switched the default to "spec" then we should add the loose option automatically.
    • handle nested .babelrc #14
    • if using jest, add "babel-core": "^7.0.0-bridge-0" #15
    • add @babel/node package if using babel-node
    • modify webpack.config.js or js file configs

cc @eventualbuddha planning on using babel-codemod for the js changes

Resolve duplicate entries

I just ran the babel-upgrade command. However, the output resulted in one plugin being set twice, which when running build threw an error about their being a duplicate plugin.

Ideally, this babel-upgrade plugin would check for duplicate entries and remove.

here was my previous .babelrc, and .after

Before

{
  "plugins": [
    "syntax-dynamic-import",
    "inline-react-svg",
    ["babel-plugin-styled-components", { "ssr": true, "displayName": false }]
  ],
  "presets": [
    [
      "env",
      {
        "targets": {
          "browsers": ["firefox >= 52"]
        },
        "modules": false
      }
    ],
    "stage-2",
    "flow",
    "react"
  ],
  "env": {
    "development": {
      "plugins": ["babel-plugin-idx"]
    },
    "production": {
      "plugins": ["babel-plugin-idx"]
    },
    "test": {
      "presets": [["env"], "react", "stage-2", "flow"],
      "plugins": ["transform-es2015-modules-commonjs"]
    }
  }
}

After

{
  "plugins": [
    "@babel/plugin-syntax-dynamic-import",
    "inline-react-svg",
    ["babel-plugin-styled-components", { "ssr": true, "displayName": false }],
    "@babel/plugin-syntax-dynamic-import",
    "@babel/plugin-syntax-import-meta",
    "@babel/plugin-proposal-class-properties",
    "@babel/plugin-proposal-json-strings",
    [
      "@babel/plugin-proposal-decorators",
      {
        "legacy": true
      }
    ],
    "@babel/plugin-proposal-function-sent",
    "@babel/plugin-proposal-export-namespace-from",
    "@babel/plugin-proposal-numeric-separator",
    "@babel/plugin-proposal-throw-expressions"
  ],
  "presets": [
    [
      "@babel/preset-env",
      {
        "targets": {
          "browsers": ["firefox >= 52"]
        },
        "modules": false
      }
    ],
    "@babel/preset-flow",
    "@babel/preset-react"
  ],
  "env": {
    "development": {
      "plugins": ["babel-plugin-idx"]
    },
    "production": {
      "plugins": ["babel-plugin-idx"]
    },
    "test": {
      "presets": [
        ["@babel/preset-env"],
        "@babel/preset-react",
        "@babel/preset-flow"
      ],
      "plugins": [
        "@babel/plugin-transform-modules-commonjs",
        "@babel/plugin-syntax-dynamic-import",
        "@babel/plugin-syntax-import-meta",
        "@babel/plugin-proposal-class-properties",
        "@babel/plugin-proposal-json-strings",
        [
          "@babel/plugin-proposal-decorators",
          {
            "legacy": true
          }
        ],
        "@babel/plugin-proposal-function-sent",
        "@babel/plugin-proposal-export-namespace-from",
        "@babel/plugin-proposal-numeric-separator",
        "@babel/plugin-proposal-throw-expressions"
      ]
    }
  }
}

Diff that came from babel-upgrade (truncated)

npx: installed 192 in 4.186s
🙌  Thanks for trying out https://github.com/babel/babel-upgrade!

Updating .babelrc config at .babelrc
Index: .babelrc
===================================================================
--- .babelrc	Before Upgrade
+++ .babelrc	After Upgrade
@@ -1,19 +1,33 @@
 {
   "plugins": [
-    "syntax-dynamic-import",
+    "@babel/plugin-syntax-dynamic-import",
     "inline-react-svg",
     [
       "babel-plugin-styled-components",
       {
         "ssr": true,
         "displayName": false
       }
-    ]
+    ],
+    "@babel/plugin-syntax-dynamic-import",
+    "@babel/plugin-syntax-import-meta",
+    "@babel/plugin-proposal-class-properties",
+    "@babel/plugin-proposal-json-strings",
+    [
+      "@babel/plugin-proposal-decorators",
+      {
+        "legacy": true
+      }
+    ],
+    "@babel/plugin-proposal-function-sent",
+    "@babel/plugin-proposal-export-namespace-from",
+    "@babel/plugin-proposal-numeric-separator",
+    "@babel/plugin-proposal-throw-expressions"

Duplicated "@babel/plugin-syntax-dynamic-import"

Intro

Hello everyone!

I'm writing down a lot of the todos just in the readme since this feels so early in the progress of this idea/tool. If we get closer we can start with individual issues, since I feel like we would just make 100 issues atm.

Philosophy

  • Works with one command npx babel-upgrade.
  • Have nice logging on what has changed, or suggestions where we can't guarantee the change is correct.
  • But allow configurability where useful
    • Allow option to specify paths for various things like source code/babelrc/package.json for fine-grained changed on specific workflows/projects. npx babel-upgrade babelrc=path packagejson=path?

Code

This is a codemod and also something you would ideally only run once on a codebase (at least for each upgrade).

  • Thus don't worry too much about doing something "slow" if the logic is simpler.
  • Needs to handle the base case, so we need testing to make sure it doesn't mess up anything it's not supposed to. Wrap any changes to the file in if checks, like if (package.dependencies) { package.dependencies = ... }
  • Organize the code in such a way that it's easy to add one-off changes, but having lots of tests/fixtures is fine.

Add a smoke test

We need to have at least one test for src/bin (run on real files).

Idea: git checkout a repo/commit, run the command, snapshot the git diff on the files changed?

Before release I try to run on a real folder anyway but this would be nice.

[ Bug ] Wrong behavior with unknown parameters

I install babel-upgrade globally, and then run babel-upgrade --help, it outputs as the same of "without parameter": check package.json & show the diff result.

I think it should show the Command-line usage, or "Unknown --help parameter" at least...

add help

babel-upgrade -h or babel-upgrade --help should show help text

SUGGESTION: Modify useBuiltIns for babel-preset-env in babelrc

The supported values for the useBuiltIns option of babel-preset-env config changed from Babel v6 to Babel v7. It used to be just a boolean in v6. However, in v7, the supported values are false, "usage" or "entry". (https://babeljs.io/docs/en/babel-preset-env#usebuiltins)

I suggest that babel-upgrade supports automatically converting an option of useBuildIns = true to one of "usage" or "entry". This helps remove a manual operation that the developer will have to do, possibly forget about (since this option change is not mentioned in the Babel v7 Upgrade Guide).

I hope this suggestion is helpful.

Plugins order are incorrect: proposal-decorators compatibility with proposal-class-properties

NOTE: Compatibility with @babel/plugin-proposal-class-properties
If you are including your plugins manually and using @babel/plugin-proposal-class-properties, make sure that @babel/plugin-proposal-decorators comes before @babel/plugin-proposal-class-properties.

https://babeljs.io/docs/en/babel-plugin-proposal-decorators#note-compatibility-with-babel-plugin-proposal-class-properties

$ npx babel-upgrade
npx: installed 192 in 54.298s
🙌  Thanks for trying out https://github.com/babel/babel-upgrade!

Updating .babelrc config at .babelrc
Index: .babelrc
===================================================================
--- .babelrc	Before Upgrade
+++ .babelrc	After Upgrade
@@ -15,10 +15,9 @@
         "useBuiltIns": "entry",
         "modules": false
       }
     ],
-    "@babel/preset-react",
-    "@babel/preset-stage-0"
+    "@babel/preset-react"
   ],
   "env": {
     "development": {
       "plugins": [
@@ -48,7 +47,33 @@
       {
         "libraryName": "antd",
         "libraryDirectory": "lib"
       }
-    ]
+    ],
+    "@babel/plugin-syntax-dynamic-import",
+    "@babel/plugin-syntax-import-meta",
+    "@babel/plugin-proposal-class-properties",
+    "@babel/plugin-proposal-json-strings",
+    [
+      "@babel/plugin-proposal-decorators",
+      {
+        "legacy": true
+      }
+    ],
+    "@babel/plugin-proposal-function-sent",
+    "@babel/plugin-proposal-export-namespace-from",
+    "@babel/plugin-proposal-numeric-separator",
+    "@babel/plugin-proposal-throw-expressions",
+    "@babel/plugin-proposal-export-default-from",
+    "@babel/plugin-proposal-logical-assignment-operators",
+    "@babel/plugin-proposal-optional-chaining",
+    [
+      "@babel/plugin-proposal-pipeline-operator",
+      {
+        "proposal": "minimal"
+      }
+    ],
+    "@babel/plugin-proposal-nullish-coalescing-operator",
+    "@babel/plugin-proposal-do-expressions",
+    "@babel/plugin-proposal-function-bind"
   ]
 }
\ No newline at end of file

Update integrations for you?

  • babel-loader -> 8.0.0-beta.0 or 7.1.2 + "babel-core": "7.0.0-bridge.0"?
  • jest adds babel-core bridge version
  • rollup needs to be 4.0.0-beta.0 #30
    • don't need external-helpers for rollup
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