babel: [Bug]: `Cannot set properties of undefined (setting 'identifier')` error when using `plugin-proposal-decorators` legacy with `plugin-transform-block-scoping`

💻

• Would you like to work on a fix?

How are you using Babel?

@babel/cli

Input code

try {
    class C {
        @Dummy foo() {
            throw new Error();
        }
    }

    let c = new C();
    c.foo();
} catch (e) {
    console.error(e);
}

Configuration file name

.babelrc

Configuration

{
  //"presets": [
  //  ["@babel/preset-env", {"targets": "firefox 50"}]
  //],
  "plugins": [
    ["@babel/plugin-proposal-decorators", {"legacy": true}],
    ["@babel/transform-block-scoping"]
  ]	
}

Current and expected behavior

Current:

TypeError: /Users/chsuh/decorators-bug/index.js: Cannot set properties of undefined (setting 'identifier')
    at PluginPass.ClassDeclaration (/Users/chsuh/decorators-bug/node_modules/@babel/plugin-proposal-decorators/lib/transformer-legacy.js:148:26)
    at newFn (/Users/chsuh/decorators-bug/node_modules/@babel/traverse/lib/visitors.js:159:21)
    at NodePath._call (/Users/chsuh/decorators-bug/node_modules/@babel/traverse/lib/path/context.js:46:20)
    at NodePath.call (/Users/chsuh/decorators-bug/node_modules/@babel/traverse/lib/path/context.js:36:17)
    at NodePath.visit (/Users/chsuh/decorators-bug/node_modules/@babel/traverse/lib/path/context.js:84:31)
    at TraversalContext.visitQueue (/Users/chsuh/decorators-bug/node_modules/@babel/traverse/lib/context.js:96:16)
    at TraversalContext.visitMultiple (/Users/chsuh/decorators-bug/node_modules/@babel/traverse/lib/context.js:67:17)
    at TraversalContext.visit (/Users/chsuh/decorators-bug/node_modules/@babel/traverse/lib/context.js:119:19)
    at traverseNode (/Users/chsuh/decorators-bug/node_modules/@babel/traverse/lib/traverse-node.js:18:17)
    at NodePath.visit (/Users/chsuh/decorators-bug/node_modules/@babel/traverse/lib/path/context.js:90:52) {
  code: 'BABEL_TRANSFORM_ERROR'
}

Environment

System: OS: macOS 13.1 Binaries: Node: 16.14.0 - ~/.nvm/versions/node/v16.14.0/bin/node npm: 8.3.1 - ~/.nvm/versions/node/v16.14.0/bin/npm npmPackages: @babel/cli: ^7.19.3 => 7.19.3 @babel/plugin-proposal-decorators: ^7.20.5 => 7.20.5 @babel/plugin-transform-block-scoping: ^7.20.5 => 7.20.5

Possible solution

No response

Additional context

No response