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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:

ts
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:

ts
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.

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

type MyContext = HydrateFlavor<Context>;

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

bot.use(hydrate());
js
import { Bot } from "grammy";
import { hydrate } from "@grammyjs/hydrate";

const bot = new Bot("");

bot.use(hydrate());
ts
import { Bot, Context } from "https://deno.land/x/grammy@v1.31.1/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.

ts
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());
js
import { Bot } from "grammy";
import { hydrateApi, hydrateContext } from "@grammyjs/hydrate";

const bot = new Bot("");

bot.use(hydrateContext());
bot.api.config.use(hydrateApi());
ts
import { Api, Bot, Context } from "https://deno.land/x/grammy@v1.31.1/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 ​