react-native-healthkit Add generateQuantityTypeSamples utility for simulator test data

Simulator testing is difficult without health data. This adds a utility to generate realistic quantity samples for testing.

Changes

New function generateQuantityTypeSamples(quantityType, numberOfSamples, options?)
- Generates samples with realistic value ranges for 60+ health metrics (steps, heart rate, calories, etc.)
- Distributes samples evenly across time period (defaults to last 30 days)
- Returns boolean indicating success
Options interface with fromDate and toDate for custom date ranges
Exported from both iOS and cross-platform entry points

Usage

import { generateQuantityTypeSamples } from '@kingstinct/react-native-healthkit'

// Generate 30 days of step data
await generateQuantityTypeSamples('HKQuantityTypeIdentifierStepCount', 30)

// Custom date range
await generateQuantityTypeSamples(
  'HKQuantityTypeIdentifierHeartRate',
  7,
  { fromDate: new Date('2024-01-01'), toDate: new Date('2024-01-07') }
)

Value ranges are predefined per quantity type (e.g., heart rate: 60-100 bpm, steps: 1000-15000).

Original prompt

This section details on the original issue you should resolve

<issue_title>Health data generation</issue_title> <issue_description>Thanks for the nice modern lib in TypeScript!

How do you handle testing on the simulator, given that it has no health data? Would it make sense to have an ability to generate test data?</issue_description>

<agent_instructions>Add a function to add quantitySamples with realistic inputs, along these lines
type Options = { fromDate, toDate } // default to last 30 days, and spread out the generation of data over this time period
generateQuantityTypeSamples(quantityType, numberOfSamples, options?: Options)
```</agent_instructions>

## Comments on the Issue (you are @copilot in this section)

<comments>
<comment_new><author>@robertherber</author><body>
That's a great idea!

I don't have time to look at it right now - but would be more than happy to merge a pull request :)</body></comment_new>
</comments>

Fixes kingstinct/react-native-healthkit#8

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Nov 15 '25 01:11 Copilot

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Latest commit: d96d927abb73e5028535fa4e1b1211a6b293de41

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npm i https://pkg.pr.new/kingstinct/react-native-healthkit/@kingstinct/react-native-healthkit@263

commit: d96d927

Nov 15 '25 05:11 pkg-pr-new[bot]