npm install tgaimage --save

<script src="https://cdn.rawgit.com/magicien/TGAImage/v1.0.0/tgaimage.min.js"></script>

var TGAImage = (function(modules){ ... })()

// You can load a TGA image with imageWithURL function.
const tga1 = TGAImage.imageWithURL('lena_std.tga')

// didLoad is Promise.
tga1.didLoad.then(() => {

  // You can get an img tag with 'image' property.
  document.getElementById('colorImgTag').appendChild(tga1.image)

  // You can get a canvas tag with 'canvas' property.
  document.getElementById('colorCanvasTag').appendChild(tga1.canvas)
})

// You can also use src and onload properties like HTMLImageElement.
const tga2 = new TGAImage()
tga2.onload = () => {
  document.getElementById('grayscaleImgTag').appendChild(tga2.image)
  document.getElementById('grayscaleCanvasTag').appendChild(tga2.canvas)
}
tga2.src = 'lena_std_grayscale.tga'