How to use the typegoose.prop function in typegoose

@JsonProperty()
    lastName: string;

    @prop()
    @JsonProperty()
    password?: string;

    @prop()
    @JsonProperty()
    picture?: string;

    // Providers data
    @prop() facebook?: string;
    @arrayProp({ items: AuthToken }) tokens?: AuthToken[];

    @prop()
    @JsonProperty({
        use: String
    })
    get fullName() {
        return `${this.firstName} ${this.lastName}`;
    }

    @instanceMethod
    matchPassword(candidatePassword: string) {
        return new Promise((resolve) => {
            bcrypt.compare(String(candidatePassword), this.password, (err, isMatch) => {
                if (err || !isMatch) return resolve(false);

                resolve(true);
            });
        });

@Expose()
    password: string;

    @prop()
    @Expose()
    firstName?: string;

    @prop()
    @Expose()
    lastName?: string;

    @prop({ enum: UserRole, default: UserRole.User })
    @Expose()
    role?: UserRole;

    @prop()
    @Expose()
    get fullName(): string {
        return `${this.firstName} ${this.lastName}`;
    }

    static get model(): ModelType {
        return new User().getModelForClass(User, { schemaOptions });
    }

    static get modelName(): string {
        return this.model.modelName;
    }

    static createModel(): InstanceType {
        return new this.model();
    }