在 React Native 中运行 Android 项目时出现此错误。
这是反应本机版本“react”的全新安装：“^16.3.1”，“react-native”：“^0.57.1”，
它给出了可选链接的错误。任何人都可以帮助我如何在本机反应中启用可选链。
Loading dependency graph, done.
BUNDLE [android, dev] ....../index.js ▓▓▓▓▓▓▓▓▓▓░░░░░░ 64.3% (667/832)::ffff:127.0.0.1 - - [02/Oct/2018:04:30:46 +0000] "GET /index.delta?platform=android&dev=true&minify=false HTTP/1.1" 500 - "-" "okhttp/3.10.0"
error: bundling failed: SyntaxError: C:\ReactNative\mrn\node_modules\react-native\Libraries\Components\Switch\Switch.js: Support for the experimental syntax 'optionalChaining' isn't currently enabled (103:41):
101 | // Support deprecated color props.
102 | let _thumbColor = thumbColor;
103 | let _trackColorForFalse = trackColor?.false;
| ^
104 | let _trackColorForTrue = trackColor?.true;
105 |
106 | // TODO: Remove support for these props after a couple releases.
Add @babel/plugin-proposal-optional-chaining (https://git.io/vb4Sk) to the 'plugins' section of your Babel config to enable transformation.
at _class.raise (C:\ReactNative\mrn\node_modules@babel\parser\lib\index.js:3939:15)
at _class.expectPlugin (C:\ReactNative\mrn\node_modules@babel\parser\lib\index.js:5253:18)
at _class.parseSubscript (C:\ReactNative\mrn\node_modules@babel\parser\lib\index.js:5959:12)
at _class.parseSubscript (C:\ReactNative\mrn\node_modules@babel\parser\lib\index.js:2716:51)
at _class.parseSubscripts (C:\ReactNative\mrn\node_modules@babel\parser\lib\index.js:5944:19)
at _class.parseSubscripts (C:\ReactNative\mrn\node_modules@babel\parser\lib\index.js:2669:52)
at _class.parseExprSubscripts (C:\ReactNative\mrn\node_modules@babel\parser\lib\index.js:5934:17)
at _class.parseMaybeUnary (C:\ReactNative\mrn\node_modules@babel\parser\lib\index.js:5903:21)
at _class.parseExprOps (C:\ReactNative\mrn\node_modules@babel\parser\lib\index.js:5812:21)
at _class.parseMaybeConditional (C:\ReactNative\mrn\node_modules@babel\parser\lib\index.js:5784:21)
BUNDLE [android, dev] ....../index.js ▓▓▓▓▓▓▓▓▓▓▓▓░░░░ 77.5% (752/854), failed.
我通过在根目录中添加文件 .babelrc 文件来修复它
{
"plugins": [
"@babel/plugin-proposal-optional-chaining"
],
"presets": [
"react-native"
]
}
更改 .babelrc 文件后重新启动 Metro
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