How to use the is-png function in is-png
To help you get started, we’ve selected a few is-png examples, based on popular ways it is used in public projects.
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1j01 / mopaint / src / components / App.js View on Github 
fileReader.onload = () => {
const arrayBuffer = fileReader.result;
const uint8Array = new Uint8Array(arrayBuffer);
if (isPNG(uint8Array)) {
const metadata = readMetadataSync(uint8Array);
const formatVersion = metadata["Mopaint Format Version"];
if (formatVersion) {
const json = metadata["Program Source"];
this.loadDocumentFromJSON(json);
} else {
// TODO: handle plain image files
this.showError({
message:
"Loading images is not supported yet (other than Mopaint PNG programs)",
});
}
} else if (uint8Array[0] === "{".charCodeAt(0)) {
const fileReader = new FileReader();
fileReader.onload = () => {
this.loadDocumentFromJSON(fileReader.result);is-png
Check if a Buffer/Uint8Array is a PNG image
