import { MongoClient } from 'mongodb';
const client = await MongoClient.connect('mongodb+srv://m001-student:m001-mongodb-basics@cluster0.ucdwm.mongodb.net/');

const docs = [];
docs[1] = {}; // works for docs[0] = {}
await client.db('test').collection('test').insertMany(docs);
await client.close();

/tmp/node_modules/mongodb/lib/bulk/common.js:730
        if ('insertOne' in op) {
                        ^

TypeError: Cannot use 'in' operator to search for 'insertOne' in undefined
    at OrderedBulkOperation.raw (/tmp/node_modules/mongodb/lib/bulk/common.js:730:25)
    at BulkWriteOperation.execute (/tmp/node_modules/mongodb/lib/operations/bulk_write.js:24:22)
    at InsertManyOperation.execute (/tmp/node_modules/mongodb/lib/operations/insert.js:75:28)
    at Object.callback (/tmp/node_modules/mongodb/lib/operations/execute_operation.js:161:19)
    at processWaitQueue (/tmp/node_modules/mongodb/lib/sdam/topology.js:668:25)
    at Topology.selectServer (/tmp/node_modules/mongodb/lib/sdam/topology.js:330:9)
    at executeWithServerSelection (/tmp/node_modules/mongodb/lib/operations/execute_operation.js:136:14)
    at /tmp/node_modules/mongodb/lib/operations/execute_operation.js:47:13
    at Object.maybePromise (/tmp/node_modules/mongodb/lib/utils.js:516:5)
    at Object.executeOperation (/tmp/node_modules/mongodb/lib/operations/execute_operation.js:16:20)