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42 lines
1.3 KiB
TypeScript
42 lines
1.3 KiB
TypeScript
import { is } from 'typescript-is';
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export const readFileAs = <T>(
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file: File,
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getReaderMethod = (reader: FileReader) => reader.readAsDataURL
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): Promise<T> => {
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return new Promise((resolve, reject) => {
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const reader = new FileReader();
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reader.onerror = reject;
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reader.onload = async (event) => {
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const buffer = event.target?.result;
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if (!buffer) reject('failed to read file');
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if (!is<T>(buffer)) reject('wrong type');
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else resolve(buffer as T);
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};
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getReaderMethod(reader as FileReader)(file);
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});
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};
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export const readFileBuffer = async (file: File): Promise<ArrayBuffer> => {
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return new Promise((resolve, reject) => {
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const reader = new FileReader();
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reader.onerror = reject;
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reader.onload = async (event) => {
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const buffer = event.target?.result;
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if (buffer === null || buffer === undefined || typeof buffer === 'string')
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reject('failed to read file');
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else resolve(buffer);
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};
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reader.readAsArrayBuffer(file);
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});
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/*return readFileAs<ArrayBuffer>(
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file,
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(reader: FileReader) => reader.readAsArrayBuffer
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);*/
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};
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export const readFileBlob = async (file: File): Promise<Blob> => {
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const data = await readFileAs<string>(file);
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return await (await fetch(data)).blob();
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};
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