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What is Membrane?

A fast, powerful way to write internal tools in TypeScript, connecting the apps you already use at work.

FEATURES
EXAMPLES
example hn follow
Uses the hn Driver to "follow" users on Hacker News and get notifications (email or SMS) when they post something new.
Set up a "cron-job" timer that invokes check periodically.
Store "last seen" in state for persistence.
Send yourself an text message
import { nodes, root, state } from "membrane";
const { hn, sms } = nodes;

export function setup() {
  root.check.$cron("30 35 * * * *");
}

export async function follow({ username }) {
  const { id, submitted } = await hn.users
    .one({ id: username })
    .$query(`{ id submitted { items { id } } }`);
  const lastSeen = submitted?.items?.[0]?.id ?? 0;
  state[username] = { id, lastSeen };
}

export async function check() {
  for (const [username, { lastSeen }] of Object.entries(state)) {
    const items = await hn.users
      .one({ id: username })
      .submitted.items.$query(`{ id }`);

    const latest = (items ?? [])[0];
    if (latest?.id! > (lastSeen as number)) {
      const url = `https://news.ycombinator.com/item?id=${latest.id}`;
      await sms.send({ message: `New HN post from ${username}: ${url}` })
      state[username] = latest.id!;
    }
  }
}
INSTALL
What is Membrane?

A fast, powerful way to write internal tools in TypeScript, connecting the apps you already use at work.

FEATURES
▼Durable Programs ....................................................................................................0
▼Cron Jobs and Timers ....................................................................................................
1
▼Membrane Web IDE ....................................................................................................2
▼The Graph ....................................................................................................
3
▼Graph-based Access Control ....................................................................................................4
▼Observability ....................................................................................................
5
▼Instantanous Deploys ....................................................................................................6
▼Step Debugger ....................................................................................................
7
▼Custom Exit Nodes ....................................................................................................8
▼HTTP Endpoints ....................................................................................................9
▼Open Source Drivers (APIs) ....................................................................................................10
▼Code completion ....................................................................................................
11

EXAMPLES
▼SMS Reminders ....................................................................................................
0
▼Discord Weather Bot ....................................................................................................1
▼Mailchimp Alerts ....................................................................................................2
▼Follow Hacker News Users ....................................................................................................3
Uses the hn Driver to "follow" users on Hacker News and get notifications (email or SMS) when they post something new.
Set up a "cron-job" timer that invokes check periodically.
Store "last seen" in state for persistence.
Send yourself an text message
import { nodes, root, state } from "membrane";
const { hn, sms } = nodes;

export function setup() {
  root.check.$cron("30 35 * * * *");
}

export async function follow({ username }) {
  const { id, submitted } = await hn.users
    .one({ id: username })
    .$query(`{ id submitted { items { id } } }`);
  const lastSeen = submitted?.items?.[0]?.id ?? 0;
  state[username] = { id, lastSeen };
}

export async function check() {
  for (const [username, { lastSeen }] of Object.entries(state)) {
    const items = await hn.users
      .one({ id: username })
      .submitted.items.$query(`{ id }`);

    const latest = (items ?? [])[0];
    if (latest?.id! > (lastSeen as number)) {
      const url = `https://news.ycombinator.com/item?id=${latest.id}`;
      await sms.send({ message: `New HN post from ${username}: ${url}` })
      state[username] = latest.id!;
    }
  }
}
INSTALL
▼Airtable changes to Email ....................................................................................................4
▼Twitter Bot ....................................................................................................5
▼HTMX Form ....................................................................................................
6
▼Github Weekly Report ....................................................................................................7
▼Github Action Alert ....................................................................................................8
▼Github Commits on Discord ....................................................................................................9
▼Track HN Jobs in Google Sheets ....................................................................................................10
▼Mailchimp to airtable ....................................................................................................11
Communication

If you're curious about Membrane's architecture, Juan joined the devtools.fm podcast to talk through the nuts and bolts.


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