Babylon.js/postProcessLibrary/tsconfig.json

{
    "extends": "../tsconfigRules",
    "compilerOptions": {
        "baseUrl": "./src/",
        "rootDir": "./src/",
        "paths": {
            "babylonjs": [
                "../../dist/preview release/babylon.module.d.ts"
            ]
        },
        "outDir": "./build"
    }
}