Hydration Plugin for grammY (hydrate)

This plugin installs useful methods on two types of objects, namely

1. the results of API calls, and
2. the objects on the context object ctx.

Instead of having to call ctx.api or bot.api and having to supply all sorts of identifiers, you can now just call methods on objects and they will just work. This is best illustrated by an example.

WITHOUT this plugin:

bot.on(":photo", async (ctx) => {
  const statusMessage = await ctx.reply("Processing");
  await doWork(ctx.msg.photo); // some long image processing
  await ctx.api.editMessageText(
    ctx.chat.id,
    statusMessage.message_id,
    "Done!",
  );
  setTimeout(
    () =>
      ctx.api.deleteMessage(ctx.chat.id, statusMessage.message_id).catch(
        () => {
          // Do nothing on error.
        },
      ),
    3000,
  );
});

WITH this plugin:

bot.on(":photo", async (ctx) => {
  const statusMessage = await ctx.reply("Processing");
  await doWork(ctx.msg.photo); // some long image processing
  await statusMessage.editText("Done!"); // so easy!
  setTimeout(() => statusMessage.delete().catch(() => {}), 3000);
});

Neat, right?

Installation

There are two ways to install this plugin.

Simple Installation

This plugin can be installed in a straightforward way that should be enough for most users.

TypeScript

import { Bot, Context } from "grammy";
import { hydrate, HydrateFlavor } from "@grammyjs/hydrate";

type MyContext = HydrateFlavor<Context>;

const bot = new Bot<MyContext>("");

bot.use(hydrate());

JavaScript

import { Bot } from "grammy";
import { hydrate } from "@grammyjs/hydrate";

const bot = new Bot("");

bot.use(hydrate());

Deno

import { Bot, Context } from "https://deno.land/x/grammy@v1.27.0/mod.ts";
import {
  hydrate,
  HydrateFlavor,
} from "https://deno.land/x/grammy_hydrate@v1.4.1/mod.ts";

type MyContext = HydrateFlavor<Context>;

const bot = new Bot<MyContext>("");

bot.use(hydrate());

Advanced Installation

When using the simple installation, only the API call results that go through ctx.api will be hydrated, e.g. ctx.reply. These are most calls for most bots.

However, some bots may need to make calls to bot.api. In this case, you should use this advanced installation.

It will integrate context hydration and API call result hydration separately into your bot. Note that you now also have to install an API flavor.

TypeScript

import { Api, Bot, Context } from "grammy";
import {
  hydrateApi,
  HydrateApiFlavor,
  hydrateContext,
  HydrateFlavor,
} from "@grammyjs/hydrate";

type MyContext = HydrateFlavor<Context>;
type MyApi = HydrateApiFlavor<Api>;

const bot = new Bot<MyContext, MyApi>("");

bot.use(hydrateContext());
bot.api.config.use(hydrateApi());

JavaScript

import { Bot } from "grammy";
import { hydrateApi, hydrateContext } from "@grammyjs/hydrate";

const bot = new Bot("");

bot.use(hydrateContext());
bot.api.config.use(hydrateApi());

Deno

import { Api, Bot, Context } from "https://deno.land/x/grammy@v1.27.0/mod.ts";
import {
  hydrateApi,
  HydrateApiFlavor,
  hydrateContext,
  HydrateFlavor,
} from "https://deno.land/x/grammy_hydrate@v1.4.1/mod.ts";

type MyContext = HydrateFlavor<Context>;
type MyApi = HydrateApiFlavor<Api>;

const bot = new Bot<MyContext, MyApi>("");

bot.use(hydrateContext());
bot.api.config.use(hydrateApi());

What Objects Are Hydrated

This plugin currently hydrates

• messages and channel posts
• edited messages and edited channel posts
• callback queries
• inline queries
• chosen inline results
• web app queries
• pre-checkout and shipping queries
• chat join requests

All objects are hydrated on

• the context object ctx,
• the update object ctx.update inside the context,
• shortcuts on the context object such as ctx.msg, and
• API call results where applicable.

Plugin Summary

• Name: hydrate
• Source
• Reference