when i run the code it tell me :

~/DiscordBot-Flash$ npm start

> [email protected] start /home/runner/DiscordBot-Flash
> node index.js

/home/runner/DiscordBot-Flash/node_modules/discord.js/src/rest/RESTManager.js:32
    const token = this.client.token ?? this.client.accessToken;
                                     ^

SyntaxError: Unexpected token '?'

client.commands = new Collection();
client.slashCommands = new Collection();
client.config = require("./config.js");
mongoose.connect(client.config.mongooseConnectionString, {
there's a error with this and the error is

Info: Make sure you have added the following url to the discord's OAuth callback url section in the developer portal:
http://localhost:3000/callback

Dashboard is up and running on port 3000.
(node:10644) DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead.
(Use node --trace-deprecation ... to show where the warning was created)
Sellout Economy#3073 is up and ready to go!
C:\Users\ladyg\Videos\DiscordBot-Flash-master\DiscordBot-Flash-master\handler\index.js:46
.commands.set(arrayOfSlashCommands);
^

TypeError: Cannot read properties of undefined (reading 'commands')

if (result.hostname.split('.').length < 3) {
^

TypeError: Cannot read properties of null (reading 'split')

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