70 lines
1.7 KiB
JavaScript
70 lines
1.7 KiB
JavaScript
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/**
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* Compatibility functions for working with File API objects
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*
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* https://developer.mozilla.org/en-US/docs/Web/API/File
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*/
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var __awaiter = this && this.__awaiter || function (thisArg, _arguments, P, generator) {
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function adopt(value) {
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return value instanceof P ? value : new P(function (resolve) {
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resolve(value);
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});
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}
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return new (P || (P = Promise))(function (resolve, reject) {
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function fulfilled(value) {
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try {
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step(generator.next(value));
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} catch (e) {
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reject(e);
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}
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}
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function rejected(value) {
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try {
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step(generator["throw"](value));
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} catch (e) {
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reject(e);
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}
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}
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function step(result) {
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result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected);
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}
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step((generator = generator.apply(thisArg, _arguments || [])).next());
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});
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};
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export function isFile(file) {
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// browser
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if (typeof File === 'function') {
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return file instanceof File;
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} // node.js
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const f = file;
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return typeof f === 'object' && typeof f.name === 'string' && (typeof f.stream === 'function' || typeof f.arrayBuffer === 'function');
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}
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/**
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* Compatibility helper for browsers where the `arrayBuffer function is
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* missing from `File` objects.
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*
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* @param file A File object
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*/
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export function fileArrayBuffer(file) {
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return __awaiter(this, void 0, void 0, function* () {
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if (file.arrayBuffer) {
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return file.arrayBuffer();
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} // workaround for Safari where arrayBuffer is not supported on Files
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return new Promise(resolve => {
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const fr = new FileReader();
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fr.onload = () => resolve(fr.result);
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fr.readAsArrayBuffer(file);
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});
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});
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}
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