cannot read property of undefined reading sourceAndMap

Obfuscator version used: 4.0.2
Node version used: 16.13.2
Webpack-obfuscator used: 3.5.1

private extractSourceAndSourceMap(asset: any): { inputSource: string, inputSourceMap: RawSourceMap } {
if (asset.sourceAndMap) { // this place
const { source, map } = asset.sourceAndMap();
return { inputSource: source, inputSourceMap: map };
} else {
return {
inputSource: asset.source(),
inputSourceMap: asset.map()
}
}
}

The issue identifies extractSourceAndSourceMap and the asset.sourceAndMap access, but names no file or test. Start by reproducing the error with Obfuscator 4.0.2, Node 16.13.2, and webpack-obfuscator 3.5.1, then trace the asset passed to this method. Done means the undefined-property failure is resolved and the affected behavior is verified.

Written by the indexing model from the issue text.