Resolving 'typesense is not defined' Error

I'm getting "typesense is not defined" whenever I try to run... I followed everything in the Install/configure guide...

Could you paste your codes?

var fs = require('fs');
var readline = require('readline');

let client = new Typesense.Client({
    'nodes': [{
      'host': 'localhost',
      'port': '8108',
      'protocol': 'http'
    }],
    'apiKey': '<API_KEY>',
    'connectionTimeoutSeconds': 2
  })


let booksSchema = {
    'name': 'books',
    'fields': [
        {'name': 'title', 'type': 'string' },
        {'name': 'authors', 'type': 'string[]' },
        {'name': 'image_url', 'type': 'string' },

        {'name': 'publication_year', 'type': 'int32' },
        {'name': 'ratings_count', 'type': 'int32' },
        {'name': 'average_rating', 'type': 'float' },

        {'name': 'authors_facet', 'type': 'string[]', 'facet': true },
        {'name': 'publication_year_facet', 'type': 'string', 'facet': true },
    ],
    'default_sorting_field': 'ratings_count'
}



client.collections().create(booksSchema)
  .then(function (data) {
    console.log(data)
  })


readline.createInterface({
    input: fs.createReadStream('./books.jsonl'),
    terminal: false
}).on('line', function(line) {
   let bookDocument = JSON.parse(line);
   client.collections('books').documents().create(bookDocument)
});

let searchParameters = {
    'q'         : 'harry',
    'query_by'  : 'title',
    'sort_by'   : 'ratings_count:desc'
  }
  
  client.collections('books')
    .documents()
    .search(searchParameters)
    .then(function (searchResults) {
      console.log(searchResults)
    })

Did you run npm i in your working director?

yes

where is your typesense import?
import Typesense from 'typesense'

Tim Echoing what Masahiro said, you want to add either an import statement or require statement to get that block of code to work.