ticket_dev/libs/heic2any/heic2any-master/docs/errors.md

Error handling

Error handling can be done via promises like this:

// fetching the heic image
fetch("./my-image.heic")
	.then((res) => res.blob())
	.then((blob) => heic2any({ blob }))
	.then((conversionResult) => {
		var url = URL.createObjectURL(conversionResult);
		document.getElementById("my-image").innerHTML = `<img src="${url}">`;
	})
	.catch((errorObject) => {
		console.log(errorObject);
	});

When an error occurs the console.log of the above example would output for example:

{
	"code": 1,
	"message": "ERR_USER library only accepts BLOBs as input"
}

The code property represents a class of error, while the message property explains deeper details of why the error occurred.

Error codes

Code	Explanation
1	A user error, user should revise the parameters given to the library function
2	LIBHEIF error, the error occurred when trying to decode the heic file
3	GIF error, the error occurred when trying to encode an animated gif.
4	DOM error, error occurred when trying to utilize the DOM API like the file reader, the Blob class and base64 encoders
5	Canvas error, error occurred when trying to setup the final conversion canvas, as the canvas api is used to convert pixel data to a real image
0	Unknown error, error doesn't belong to any of the above classes.