const faker = require("faker")
const bcrypt = require("bcrypt")
const dataLength = 9 //how many seeds should be generated

//generate bcrypt password
const plainPwd = "admin"
const salt = await bcrypt.genSalt(10)
const password = await bcrypt.hash(plainPwd, salt)

exports.seed = function (knex, Promise) {
    return knex("users").del()
        .then(function () {
            const users = []
            for (let index = 0; index < dataLength; index++) {
                users.push({
                    username: faker.internet.userName(),
                    password: faker.internet.password(),
                    createdAt: faker.date.recent(),
                    updatedAt: faker.date.recent(),
                    deletedAt: faker.date.recent(),
                    deleted: faker.random.boolean(),
                })
            }
            users.push({
                username: "admin",
                password: password,
                createdAt: faker.date.recent(),
                updatedAt: faker.date.recent(),
                deletedAt: null,
                deleted: false,
            })
            return knex("users").insert(users)
        })
}

const salt = await bcrypt.genSalt(10)
                   ^^^^^^

SyntaxError: Unexpected identifier
    at createScript (vm.js:74:10)
    at Object.runInThisContext (vm.js:116:10)
    at Module._compile (module.js:537:28)
    at Object.Module._extensions..js (module.js:584:10)
    at Module.load (module.js:507:32)
    at tryModuleLoad (module.js:470:12)
    at Function.Module._load (module.js:462:3)
    at Module.require (module.js:517:17)
    at require (internal/module.js:11:18)
    at Seeder._validateSeedStructure (C:UsersuserDesktopCoding Projectsnode_modulesknexlibseedindex.js:113:14)

    at wrapper (C:UsersuserDesktopCoding Projectsnode_moduleslodash_createBind.js:23:15)
    at arrayMap (C:UsersuserDesktopCoding Projectsnode_moduleslodash_arrayMap.js:16:21)
    at map (C:UsersuserDesktopCoding Projectsnode_moduleslodashmap.js:50:10)
    at Seeder._runSeeds (C:UsersuserDesktopCoding Projectsnode_modulesknexlibseedindex.js:104:51)
    at Seeder.<anonymous> (C:UsersuserDesktopCoding Projectsnode_modulesknexlibseedindex.js:66:17)
    at Seeder.tryCatcher (C:UsersuserDesktopCoding Projectsnode_modulesbluebirdjsreleaseutil.js:16:23)
    at Promise._settlePromiseFromHandler (C:UsersuserDesktopCoding Projectsnode_modulesbluebirdjsreleasepromis
e.js:509:35)
    at Promise._settlePromise (C:UsersuserDesktopCoding Projectsnode_modulesbluebirdjsreleasepromise.js:569:18
)
    at Promise._settlePromise0 (C:UsersuserDesktopCoding Projectsnode_modulesbluebirdjsreleasepromise.js:614:1
0)
    at Promise._settlePromises (C:UsersuserDesktopCoding Projectsnode_modulesbluebirdjsreleasepromise.js:693:1
8)
    at Promise._fulfill (C:UsersuserDesktopCoding Projectsnode_modulesbluebirdjsreleasepromise.js:638:18)
    at PromiseArray._resolve (C:UsersuserDesktopCoding Projectsnode_modulesbluebirdjsreleasepromise_array.js:1
26:19)