Discussion on: [Nestia] Boost up NestJS server much faster and easier (maximum 20,000x faster + tRPC similar)

export class BbsArticle {
    @IsString()
    @ApiProperty({
        format: "uuid",
    })
    id!: string;

    // DUPLICATED SCHEMA DEFINITION
    // - duplicated function call + property type
    // - have to specify `isArray` and `nullable` props by yourself
    @IsArray()
    @IsObject()
    @ValidateNested()
    @Type(() => AttachmentFile)
    @ApiProperty({
        type: () => AttachmentFile,
        nullable: true,
        isArray: true,
        description: "List of attached files.",
    })
    files!: AttachmentFile[] | null;

    @IsString()
    @IsOptional()
    @ApiProperty({
        type: "string",
        nullable: true,
        minLength: 5,
        maxLength: 100,
        description: "Title of the article.",
    })
    title!: string | null;

    @IsString()
    @ApiProperty({
        description: "Main content body of the article."
    })
    body!: string;

    @IsString()
    @ApiProperty({
        format: "date-time",
        description: "Creation time of article",
    })
    created_at!: string;
}

export class AttachmentFile {
    @IsString()
    @IsOptional()
    @ApiProperty({
        type: "string",
        nullable: true,
        maxLength: 255,
        pattern: "^[a-zA-Z0-9-_]+$",
        description: "File name.",
    })
    name!: string | null;

    @IsString()
    @IsOptional()
    @ApiProperty({
        type: "string",
        nullable: true,
        maxLength: 255,
        pattern: "^[a-zA-Z0-9-_]+$",
        description: "File extension.",
    })
    extension!: string | null;

    @IsString()
    @ApiProperty({
        format: "url",
        description: "URL of the file.",
    })
    url!: string;
}