How to use 'js import file' in JavaScript

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function importFile2() {
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	let input_files = d3.select("#ImportfileInput").node().files;
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	let merge = d3.select("#mergeCheckBox").property("checked");
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	let oldFormat = d3.select("#OldFormatCheckBox").property("checked");
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	// let top_graph = d3.select("#graphPathInput").property("value");
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	// if (top_graph === "" && !oldFormat) { alert("the new hierarchy position is empty"); return 0; }
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	if (input_files.length > 0) {
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		let file = input_files[0];
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		let ka = new FileReader();
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		ka.onloadend = function (e) {
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			if (oldFormat) {
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				converter.kamiToRegraph(e.target.result, dispatch, "Graph");
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			}
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			else {
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				d3.json(e.target.result, function (rep) {
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					if (merge) {
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						request.mergeHierarchy2(
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							//top_graph,
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							"/",
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							JSON.stringify(rep, null, "\t"),
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							afterImport);
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					}
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					else {
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						request.mergeHierarchy(
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							"/",
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							// top_graph,
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							JSON.stringify(rep, null, "\t"),
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							afterImport);
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						// request.addHierarchy(
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						// 	top_graph,
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						// 	JSON.stringify(rep, null, "\t"),
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						// 	afterImport);
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					}
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				})
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			}
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		};
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		ka.readAsDataURL(file);
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	}
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}

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function _load_import() {
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  return _import = _interopRequireWildcard(require('./import.js'));
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}