When I use @babel/plugin-transform-typescript to compile typescript, the warning happens
This problem is likely caused by another plugin injecting "_class" without registering it in the scope tracker. If you are the author of that plugin, please use "scope.registerDeclaration(declarationPath)". The exported identifier "_class" is not declared in Babel's scope tracker as a JavaScript value binding, and "@babel/plugin-transform-typescript" never encountered it as a TypeScript type declaration. It will be treated as a JavaScript value.
I cannot find out why.
Here is my babel.config.js
module.exports = {
presets: ['@babel/preset-typescript', '@babel/preset-react', '@babel/preset-env', 'mobx'],
plugins: [
['@babel/plugin-transform-typescript', { allowNamespaces: true }],
// Stage 0
'@babel/plugin-proposal-function-bind',
// Stage 1
'@babel/plugin-proposal-export-default-from',
'@babel/plugin-proposal-logical-assignment-operators',
['@babel/plugin-proposal-optional-chaining', { loose: false }],
['@babel/plugin-proposal-pipeline-operator', { proposal: 'minimal' }],
['@babel/plugin-proposal-nullish-coalescing-operator', { loose: false }],
'@babel/plugin-proposal-do-expressions',
// Stage 2
['@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-object-rest-spread',
// Stage 3
'@babel/plugin-syntax-dynamic-import',
'@babel/plugin-syntax-import-meta',
['@babel/plugin-proposal-class-properties', { loose: true }],
// '@babel/plugin-proposal-json-strings',
// Other
'@babel/plugin-transform-runtime',
'@babel/plugin-transform-modules-commonjs',
'jsx-control-statements'
]
}
And part of my webpack.config.js
module.exports = {
// ...
resolve: {
// Add '.ts' and '.tsx' as resolvable extensions.
extensions: ['.js', '.ts', '.tsx']
},
module: {
rules: [
{
test: /\.[tj]sx?$/,
loader: 'babel-loader',
},
]
}
};
And the program works OK. When I use ts-loader
instead, it's OK too.
Can you help me? Thanks.
The issue is fixed. You can see https://github.com/babel/babel/issues/10264