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Dec 13, 2018
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Add tip about detecting modern mode #3108

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11ca8b9
Add tip abouit detecting modern mode
LinusBorg Dec 10, 2018
0502144
add note about postcss
LinusBorg Dec 10, 2018
08b5230
docs: fix typo and format [ci skip]
haoqunjiang Dec 13, 2018
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11 changes: 11 additions & 0 deletions docs/guide/browser-compatibility.md
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Expand Up @@ -78,6 +78,17 @@ Content-Security-Policy: script-src 'self' 'sha256-4RS22DYeB7U14dra4KcQYxmwt5HkO
```
:::

::: tip Detecting the Current Mode in Config
Sometimes you may need to change the webpack config only for the legacy build, or only for the modern build.

Vue CLI uses two environment variables to communicate this:

* `VUE_CLI_MODERN_MODE`: The build was started with the `--modern` flag
* `VUE_CLI_MODERN_BUILD`: when true, the current config is for the modern build. Otherwise it's for the legacy build.

**Important:** These variables are only accessible when/after `chainWebpack()` and `configureWebpack()` functions are evaluated, (so not directly in the `vue.config.js` module's root scope). That means it's also available in the postcss config file.
:::

[autoprefixer]: https://github.com/postcss/autoprefixer
[babel-preset-env]: https://new.babeljs.io/docs/en/next/babel-preset-env.html
[babel-preset-app]: https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/babel-preset-app
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