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Getting Started

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  1. Install the package

    Terminal window
    npm i @capgo/capacitor-flash

  2. Sync with native projects

    Terminal window
    npx cap sync

Usage

Import the plugin and use its methods to control the flashlight:

import { CapacitorFlash } from '@capgo/capacitor-flash';


// Check if flashlight is available
const checkFlashlight = async () => {
  const { value } = await CapacitorFlash.isAvailable();
  console.log('Flashlight available:', value);
};


// Turn on flashlight
const turnOn = async () => {
  await CapacitorFlash.switchOn();
};


// Turn off flashlight
const turnOff = async () => {
  await CapacitorFlash.switchOff();
};


// Check if flashlight is on
const checkStatus = async () => {
  const { value } = await CapacitorFlash.isSwitchedOn();
  console.log('Flashlight is on:', value);
};


// Toggle flashlight
const toggle = async () => {
  await CapacitorFlash.toggle();
};

API Reference

isAvailable()

Checks if flashlight is available on the device.

const result = await CapacitorFlash.isAvailable();
// Returns: { value: boolean }

switchOn(options?)

Turns the flashlight on.

interface SwitchOnOptions {
  intensity?: number; // 0.0 to 1.0 (iOS only)
}


await CapacitorFlash.switchOn({ intensity: 0.5 });

switchOff()

Turns the flashlight off.

await CapacitorFlash.switchOff();

isSwitchedOn()

Checks if the flashlight is currently on.

const result = await CapacitorFlash.isSwitchedOn();
// Returns: { value: boolean }

toggle()

Toggles the flashlight on/off.

await CapacitorFlash.toggle();

Complete Example

import { CapacitorFlash } from '@capgo/capacitor-flash';


export class FlashlightService {
  private isOn = false;


  async init() {
    const { value } = await CapacitorFlash.isAvailable();
    if (!value) {
      throw new Error('Flashlight not available on this device');
    }
  }


  async toggle() {
    if (this.isOn) {
      await CapacitorFlash.switchOff();
    } else {
      await CapacitorFlash.switchOn();
    }
    this.isOn = !this.isOn;
  }


  async turnOn(intensity?: number) {
    await CapacitorFlash.switchOn({ intensity });
    this.isOn = true;
  }


  async turnOff() {
    await CapacitorFlash.switchOff();
    this.isOn = false;
  }


  async strobe(intervalMs: number = 100, duration: number = 3000) {
    const endTime = Date.now() + duration;


    while (Date.now() < endTime) {
      await CapacitorFlash.toggle();
      await new Promise(resolve => setTimeout(resolve, intervalMs));
    }


    // Ensure flashlight is off after strobe
    await CapacitorFlash.switchOff();
    this.isOn = false;
  }
}

Best Practices

  1. Check availability first Always verify flashlight availability before using it:

    const { value } = await CapacitorFlash.isAvailable();
    if (!value) {
      // Show alternative UI or disable flashlight features
    }

  2. Handle errors gracefully

    try {
      await CapacitorFlash.switchOn();
    } catch (error) {
      console.error('Failed to turn on flashlight:', error);
    }

  3. Turn off when not needed Always turn off the flashlight when your app goes to background or when the feature is no longer needed to save battery.

  4. Avoid rapid toggling Implement debouncing to prevent rapid on/off switching which could damage the LED or drain battery.

Platform Notes

iOS

  • Requires iOS 10.0+
  • Uses AVCaptureDevice torch mode
  • Supports intensity control (0.0 to 1.0)

Android

  • Requires Android 6.0 (API 23)+
  • Uses Camera2 API
  • Intensity control not supported (uses default brightness)

Web

  • Not supported on web platform
  • Will return isAvailable: false