Fast-Object

Fast object creator, via transforming to JSON.parse(), but type safe.

• Faster apps with JSON.parse (Chrome Dev Summit 2019)
• The cost of parsing JSON

You know what? JSON.parse() is faster than literal construction, when only one-time constructed.

fast-object is a transformer library which converts a literal object construction to a JSON.parse() function call expression with JSON string argument. Therefore, if you construct a literal object with fast-object, you can get benefit from type safety and perforamce tuning at the same time.

Look at the below code, then you may understand how fast-object works.

example.ts

import create from "fast-object";

interface IUser {
    id: number;
    account: string;
    name: string;
}
const member: IUser = create({
    id: 1,
    account: "samchon",
    name: "Jeongho Nam",
});

example.js

const member = JSON.parse("{\"id\":1,\"account\":\"samchon\",\"name\":\"Jeongho Nam\"}");

Setup

NPM Package

At first, install this fast-object by the npm install command.

Also, you need additional devDependencies to compile the TypeScript code with transformation. Therefore, install those all libraries typescript, ttypescript and ts-node. Note that, ttypescript is not mis-writing. Therefore, do not forget to install the ttypescript.

npm install --save fast-object

# ENSURE THOSE PACKAGES ARE INSTALLED
npm install --save-dev typescript
npm install --save-dev ttypescript
npm install --save-dev ts-node

tsconfig.json

After the installation, you've to configure the tsconfig.json file like below. Add the new property transform and its value fast-object/lib/transform into the compilerOptions.plugins array.

{
  "compilerOptions": {
    "plugins": [
      {
        "transform": "fast-object/lib/transform"
      }
    ]
  }
}

After the tsconfig.json definition, you can compile fast-object utilized code by using ttypescript. If you want to run your TypeScript file through ts-node, use -C ttypescript argument like below:

# COMPILE
npx ttsc

# WITH TS-NODE
npx ts-node -C ttypescript

webpack

If you're using a webpack with ts-loader, configure the webpack.config.js file like below:

const transform = require('fast-object/lib/transform').default;

module.exports = {
    // I am hiding the rest of the webpack config
    module: {
        rules: [
            {
                test: /\.ts$/,
                exclude: /node_modules/,
                loader: 'ts-loader',
                options: {
                    getCustomTransformers: program => ({
                        before: [transform(program)]
                    })
                }
            }
        ]
    }
};

Features

Default Function

export default function create<T>(input: T): T;

fast-object provides only one default function create().

Just import it and utilize the function to boost up your object construction speed.

import create from "fast-object";

const member: IUser = create({
    id: 1,
    account: "samchon",
    name: "Jeongho Nam",
});

Literal Only

Use only constant literal values.

fast-object is a transformer library which converts literal object construction to a JSON.parse() function call expression with JSON string argument. Therefore, you have you only constant literal values in that object.

If you're using a variable value like below, fast-object will throw an exception.

import create from "fast-object";

const account: string = "samchon";
const member: IUser = create({
    id: 1,
    account, // DON'T DO THAT
    name: "Jeongho Nam",
});

Appendix

My anothers libraries using TypeScript Compiler API.

TypeScript-JSON

typescript-json is not 10x faster yet, but would be soon in the v3 update.

https://github.com/samchon/typescript-json

Runtime type checker, and 10x faster JSON.stringify() function, with only one line.

import TSON from "typescript-json";

TSON.assert<T>(input); // runtime type checker throwing exception
TSON.is<T>(input); // runtime type checker returning boolean
TSON.stringify<T>(input); // 10x faster JSON.stringify()
TSON.create<T>(input); // same with this fast-object

typescript-json is a transformer library providing JSON related functions.

For an example, with typescript-json, type check in the runtime is possible. Boosting up JSON string conversion speed about 10x times faster or creating is also possible. Important thing is, all of those features can be used by only one line. Besides, other similar libraries like ajv or fast-json-stringify, they require complicate JSON schema definition.

Furthermore, typescript-json does not require any optimizer plan construction in the runtime. Therefore, typescript-json is about 10,000x times faster than ajv and fast-json-stringify, if compare only one-time JSON string conversion or validation.

Only JSON string conversion time | Include optimization planning time ---------------------------------|------------------------------------ |

Nestia

https://github.com/samchon/nestia

Automatic SDK and Swagger generator for the NestJS, evolved than ever.

nestia is an evolved SDK and Swagger generator, which analyzes your NestJS server code in the compilation level. With nestia and compilation level analyzer, you don't need to write any swagger or class-validator decorators.

Reading below table and example code, feel how the "compilation level" makes nestia stronger.

Components | nestia::SDK | nestia::swagger | @nestjs/swagger -----------|---|---|--- Pure DTO interface | ✔ | ✔ | ❌ Description comments | ✔ | ✔ | ❌ Simple structure | ✔ | ✔ | ✔ Generic type | ✔ | ✔ | ❌ Union type | ✔ | ✔ | ▲ Intersection type | ✔ | ✔ | ▲ Conditional type | ✔ | ▲ | ❌ Auto completion | ✔ | ❌ | ❌ Type hints | ✔ | ❌ | ❌ 2x faster JSON.stringify() | ✔ | ❌ | ❌ Ensure type safety | ✅ | ❌ | ❌

// IMPORT SDK LIBRARY GENERATED BY NESTIA
import api from "@samchon/shopping-api";
import { IPage } from "@samchon/shopping-api/lib/structures/IPage";
import { ISale } from "@samchon/shopping-api/lib/structures/ISale";
import { ISaleArticleComment } from "@samchon/shopping-api/lib/structures/ISaleArticleComment";
import { ISaleQuestion } from "@samchon/shopping-api/lib/structures/ISaleQuestion";

export async function trace_sale_question_and_comment
    (connection: api.IConnection): Promise<void>
{
    // LIST UP SALE SUMMARIES
    const index: IPage<ISale.ISummary> = await api.functional.shoppings.sales.index
    (
        connection,
        "general",
        { limit: 100, page: 1 }
    );

    // PICK A SALE
    const sale: ISale = await api.functional.shoppings.sales.at
    (
        connection, 
        index.data[0].id
    );
    console.log("sale", sale);

    // WRITE A QUESTION
    const question: ISaleQuestion = await api.functional.shoppings.sales.questions.store
    (
        connection,
        "general",
        sale.id,
        {
            title: "How to use this product?",
            body: "The description is not fully enough. Can you introduce me more?",
            files: []
        }
    );
    console.log("question", question);

    // WRITE A COMMENT
    const comment: ISaleArticleComment = await api.functional.shoppings.sales.comments.store
    (
        connection,
        "general",
        sale.id,
        question.id,
        {
            body: "p.s) Can you send me a detailed catalogue?",
            anonymous: false
        }
    );
    console.log("comment", comment);
}

Nestia-Helper

https://github.com/samchon/nestia-helper

Boost up JSON.stringify() function, of the API responses, 10x times faster.

nestia-helper is a helper library of NestJS, which can boost up the JSON.stringify() function 10x times faster about the API responses. Just by installing and utilizing this nestia-helper, your NestJS developed backend server will convert JSON string 10x times faster.

import helper from "nestia-helper";
import * as nest from "@nestjs/common";

@nest.Controller("bbs/articles")
export class BbsArticlesController
{
    // JSON.stringify for IPage<IBbsArticle.ISummary> would be 2 times faster 
    @helper.TypedRoute.Get()
    public get(): Promise<IPage<IBbsArticle.ISummary>>;
}