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No se pueden leer las propiedades de undefined (leyendo 'db')

Mi información de mongodb, etc. La ingresé correctamente, pero cada vez que intento ejecutar el código, sigo recibiendo este error. Se adjunta parte de mi código y una imagen del error.

error

Código fuente

 const vars = require("../variables"); const url = vars.dbLink; // vars.dbLink const dbName = "channels"; var database; const client = new MongoClient(url, { useNewUrlParser: true, useUnifiedTopology: true }); function connect(callback) { MongoClient.connect(url, { useNewUrlParser: true }, (err, res) => { const db = res.db(dbName); database = db; return callback(err); }); }
about 4 years ago · Juan Pablo Isaza
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