feat(types): add min_lines/max_lines to RichTextInput

[srtaalej]

Summary

Adds optional min_lines and max_lines integer properties to the RichTextInput Block Kit element interface, allowing developers to control the visible height of rich_text_input elements.

• min_lines — minimum number of visible lines (1–50)
• max_lines — maximum number of visible lines before scrolling (1–50, defaults to 8 on the platform when unset)

Both properties are optional, preserving full backward compatibility.

Testing

Test app.js

import { App } from '@slack/bolt';

const app = new App({
  token: process.env.SLACK_BOT_TOKEN,
  socketMode: true,
  appToken: process.env.SLACK_APP_TOKEN,
});

app.command('/rich-text-test', async ({ ack, client, body }) => {
  await ack();
  await client.views.open({
    trigger_id: body.trigger_id,
    view: {
      type: 'modal',
      title: { type: 'plain_text', text: 'Rich Text Test' },
      submit: { type: 'plain_text', text: 'Submit' },
      blocks: [
        {
          type: 'input',
          block_id: 'rich_text_block',
          label: { type: 'plain_text', text: 'Default (no min/max — should be 8 max)' },
          element: {
            type: 'rich_text_input',
            action_id: 'default_input',
          },
        },
        {
          type: 'input',
          block_id: 'rich_text_min_block',
          label: { type: 'plain_text', text: 'min_lines: 5' },
          element: {
            type: 'rich_text_input',
            action_id: 'min_input',
            min_lines: 5,
          },
        },
        {
          type: 'input',
          block_id: 'rich_text_max_block',
          label: { type: 'plain_text', text: 'max_lines: 16' },
          element: {
            type: 'rich_text_input',
            action_id: 'max_input',
            max_lines: 16,
          },
        },
        {
          type: 'input',
          block_id: 'rich_text_both_block',
          label: { type: 'plain_text', text: 'min_lines: 3, max_lines: 20' },
          element: {
            type: 'rich_text_input',
            action_id: 'both_input',
            min_lines: 3,
            max_lines: 20,
          },
        },
      ],
    },
  });
});

(async () => {
  await app.start();
  app.logger.info('⚡️ Rich Text Test app is running!');
})();

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[changeset-bot]

🦋 Changeset detected

Latest commit: d2941d3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@slack/types	Minor

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.11%. Comparing base (046647f) to head (d2941d3).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2680   +/-   ##
=======================================
  Coverage   89.11%   89.11%           
=======================================
  Files          65       65           
  Lines       10339    10339           
  Branches      471      471           
=======================================
  Hits         9214     9214           
  Misses       1095     1095           
  Partials       30       30           

Flag	Coverage Δ
cli-hooks	89.11% <ø> (ø)
cli-test	89.11% <ø> (ø)
logger	89.11% <ø> (ø)
oauth	89.11% <ø> (ø)
socket-mode	89.11% <ø> (ø)
web-api	89.11% <ø> (ø)
webhook	89.11% <ø> (ø)

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[zimeg]

@srtaalej LGTM and thank you for updating these block inputs 📝

I'm approving now with a note that the JSDoc might need updating to match the backend capabilities of the moment. When confident please do feel free to merge this 🚢 💨

[zimeg]

Suggested change

	* @description The minimum number of lines of text shown in the input. Must be between 1 and 50.
	* @description The minimum number of lines of text shown in the input. Must be between 1 and 100.

🔬 question: I find the API docs suggest "100" as a maximum minimum - would this be something to update here or in reference?

The minimum number of visible text lines the input should display before scrolling. Controls the initial height of the input. Must be between 1 and 100.

🔗 https://docs.slack.dev/reference/block-kit/block-elements/rich-text-input-element/

[zimeg]

Suggested change

	* @description The maximum number of lines of text shown in the input before it scrolls. Must be between 1 and 50.
	* @description The maximum number of lines of text shown in the input before it scrolls. Must be between 1 and 100.

🦠 note: Similar suggestion as above!

[zimeg]

Suggested change

	min_lines: '3',
	min_lines: '3', // Minimum should be integer

🧪 suggestion(non-blocking): To make these spec more clear!

[zimeg]

🌟 praise: Thanks for keeping qualities highest with test! I'm hoping we can organize this file as more coverage is added for other elements ongoing.