js-uploader/dist/esm/uploader/helpers/file-reader.js

A JavaScript library for file upload

export var fileReader = function (uploadfile, start, end) {
    return new Promise(function (resolve) {
        var raw = uploadfile.raw;
        start = start || 0;
        end = end || uploadfile.size;
        if (raw instanceof Blob) {
            var blob = raw.slice(start, end);
            resolve(blob);
        }
        else {
            // TODO
            throw new Error();
        }
    });
};
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