babel-preset-env

Error: Cannot load preset env relative to / in a browser

由 大憨熊 提交于 2021-02-10 17:29:48
问题 I am creating interactive JavaScript coding exercise using ACE editor. to execute entered code have have to transform code. for that i am using @balel/core transform method. I am facing below problems when I use presets: ["env"] in options i am getting Error: Cannot load preset env relative to / in a browser . I already did npm install babel-preset-env to install preset transform is not overriding option babelrc: true 回答1: cannot run babe-core in browser begin with version 6.0. only node so

Confused about useBuiltIns option of @babel/preset-env (using Browserslist Integration)

由 久未见 提交于 2019-12-31 11:28:53
问题 I'm working on a web project using Babel 7 with Webpack 4. I've never used Babel before and can't really understand some parts of it. Based on the documentation I'm using @babel/preset-env because it seems the recommended way (especially for beginners). Also using Browserslist integration via my .browserslistrc file. Webpack does the compilation well ( babel-loader version 8.0.2 ), I have no errors but I'm confused about this useBuiltIns: "entry" option mentioned here and how polyfill system

Unable to run a node.js file with @babel/preset-env

由 拜拜、爱过 提交于 2019-12-23 01:52:09
问题 I'm trying to run a simple node.js file which needs the @babel/preset-env preset. The moment I run the js file, I get a message saying Requires Babel “7.0.0-0” but was loaded with “6.26.3” To replicate the issue, please try the following in a new folder: 1. Run the following commands npm init npm install @babel/register npm install @babel/core@^7.2.2 npm install @babel/preset-env Create a .babelrc file with the following { "presets": ["@babel/preset-env"], "plugins": [] } Create a sample emp

what does the “modules:auto” means in @babel/preset-env field?

由 时光毁灭记忆、已成空白 提交于 2019-12-02 04:30:28
问题 the babel docs say the modules default option is auto, what does the auto means? does it transform the "import" to "require" or not? what's the difference between "modules: false" and "modules: auto"? it seems they are the same result; I'm learning tree shaking, when I didn't set any options to my @babel/preset-env, tree shaking success, when I set "modules: false", the tree shaking also succeed; "presets": [ [ "@babel/preset-react" ], [ "@babel/preset-env",{"modules": "false"} ] ], 回答1: auto

what does the “modules:auto” means in @babel/preset-env field?

由 若如初见. 提交于 2019-12-01 23:46:23
the babel docs say the modules default option is auto, what does the auto means? does it transform the "import" to "require" or not? what's the difference between "modules: false" and "modules: auto"? it seems they are the same result; I'm learning tree shaking, when I didn't set any options to my @babel/preset-env, tree shaking success, when I set "modules: false", the tree shaking also succeed; "presets": [ [ "@babel/preset-react" ], [ "@babel/preset-env",{"modules": "false"} ] ], auto means default value and default value of modules is false . See - https://github.com/babel/babel/pull/8485
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