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20 lines
720 B
TypeScript
20 lines
720 B
TypeScript
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import { PDFDocument } from 'pdf-lib';
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export async function createSubDocument(pdfDoc: PDFDocument, pagesToExtractArray: number[]): Promise<Uint8Array> {
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const subDocument = await PDFDocument.create();
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// Check that array max number is not larger pdf pages number
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if(Math.max(...pagesToExtractArray) >= pdfDoc.getPageCount()) {
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throw new Error(`The PDF document only has ${pdfDoc.getPageCount()} pages and you tried to extract page ${Math.max(...pagesToExtractArray)}`);
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}
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const copiedPages = await subDocument.copyPages(pdfDoc, pagesToExtractArray);
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for (let i = 0; i < copiedPages.length; i++) {
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subDocument.addPage(copiedPages[i]);
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}
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return subDocument.save();
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}
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