how to get Octokit client in an express route

[LeoQuote]

I can get Octokit easily with context.octokit , but there's no context in custom express route, what is the most efficient way to get an authenticated client?

I tried

      const client = new ProbotOctokit({
        auth: {
          appId: process.env.APP_ID,
          privateKey: process.env.PRIVATE_KEY,
          baseUrl: process.env.GHE_HOST
        }
      })
      await client.issues.create({owner: "me", repo: "test-repo", title: "test",})

but no luck , saying [@octokit/auth-app] installationId option is required for installation authentication.

[gr2m]

Probot exports a middleware that is compatible with Express:
https://probot.github.io/docs/development/#use-createnodemiddleware

Does that work for you?

[LeoQuote]

Not releavant, I'm using express to receive event other than github webhook, like a slack webhook event, how can I do this ?

[LeoQuote]

I believe this is the most efficiant way I can find:

import {ProbotOctokit} from "probot";
import { readEnvOptions } from "probot/lib/bin/read-env-options";
const { createAppAuth } = require("@octokit/auth-app");

// a client to get installation id
const auth = createAppAuth({
  appId: probotOptions.appId,
  privateKey: probotOptions.privateKey,
  baseUrl: probotOptions.baseUrl,
})
const appAuthentication  = await auth({
  type: "app"
})
const listInstallClient = new ProbotOctokit({
  auth: appAuthentication,
  baseUrl: probotOptions.baseUrl,
})
const installationID = await listInstallClient.apps.getRepoInstallation({owner: "qizhicheng", repo: "test-repo"})
// get real operate client using installation id
const operateClient = new ProbotOctokit({
  authStrategy: createAppAuth,
  auth: {
    appId: probotOptions.appId,
    privateKey: probotOptions.privateKey,
    baseUrl: probotOptions.baseUrl,
    installationId: installationID.data.id
  },
  baseUrl: probotOptions.baseUrl,
})
await operateClient.issues.create({owner: "test", repo: "test", title: "test",})