TypeError: commands.help is not a function

[arthurzenika]

/home/arthur/.npm-packages/lib/node_modules/wizzy/src/index.js:16
    commands.help();
             ^

TypeError: commands.help is not a function
    at Object.<anonymous> (/home/arthur/.npm-packages/lib/node_modules/wizzy/src/index.js:16:11)
    at Module._compile (internal/modules/cjs/loader.js:776:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:787:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:829:12)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)

$ node -v
v10.16.0
$ npm -v
6.9.0