tsconfig.json

{
    "compilerOptions": {
        "alwaysStrict": true,
        "esModuleInterop": true,
        "forceConsistentCasingInFileNames": true,
        "lib": [
            "es2017"
        ],
        "module": "commonjs",
        "noFallthroughCasesInSwitch": true,
        "noImplicitAny": true,
        "noImplicitReturns": true,
        "noImplicitThis": true,
        "noUnusedLocals": true,
        "noUnusedParameters": true,
        "outDir": "out",
        "rootDir": ".",
        "sourceMap": true,
        "strictBindCallApply": true,
        "strictFunctionTypes": true,
        "strictNullChecks": true,
        "strictPropertyInitialization": true,
        "target": "es2017",
        "baseUrl": "./",
        "paths": {
            "pdfjs-dist": ["types/pdfjs-dist"],
            "mathjax-node": ["types/mathjax-node"]
        },
        "typeRoots": ["./types", "./node_modules/@types"]
    },
    "exclude": [
        "node_modules",
        "viewer"
    ]
}