I need to import a javascript lib into my project without .d.ts files (for some reason it doesn't have), while sadly I cannot use 'import' or 'require' at the same time (the ts poject structure is old but cannot upgrade).Is there still any solution?The tsconfig.json may like the following:

{
    "compilerOptions": {
        "target": "ES5",
        "module": "amd",
        "skipLibCheck": true,
        "lib": [
            "DOM",
            "ES2015"
        ],
        "allowJs": true,
        "checkJs": false,
        "outFile": "./out/js/bundle.js"
    },
    "exclude": [
        "node_modules"
    ],
    "include": [
        "./lib/lib.js",
        "./src/**/*.ts"
    ]
}