21 lines
642 B
TypeScript
21 lines
642 B
TypeScript
const cachedResourceMap = new Map<string, string>();
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function convertResourceToDataURL(url: string, useCache = true): Promise<string> {
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if (useCache && cachedResourceMap.has(url)) {
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return Promise.resolve(cachedResourceMap.get(url) as string);
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}
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return new Promise(async (resolve) => {
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const res = await fetch(url);
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const blob = await res.blob();
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var reader = new FileReader();
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reader.onloadend = () => {
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const base64Url = reader.result as string;
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cachedResourceMap.set(url, base64Url);
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resolve(base64Url);
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};
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reader.readAsDataURL(blob);
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});
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}
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export default convertResourceToDataURL;
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