sheetjs/tsconfig.json

{
    "compilerOptions": {
        "module": "commonjs",
        "target": "es6",
        "noImplicitAny": true,
        "strictNullChecks": false,
        "baseUrl": "../",
        "typesRoot": "../"
    },
    "files": [
        "index.d.ts",
        "xlsx-tests.ts"
    ]
}