Function htmlToPdfBuffer

src/node/utils/ExportPdfNative.ts:44–248

(html: string)

};

export const htmlToPdfBuffer = (html: string): Promise<Buffer> =>
  new Promise((resolve, reject) => {
    // compress:false keeps the content stream uncompressed. Pads are small
    // enough that the size cost is negligible, and it lets ops greppable PDFs
    // out of the box for accessibility / search-engine indexers that don't
    // FlateDecode.
    const doc = new PDFDocument({margin: 50, compress: false});
    const stream = new PassThrough();
    const chunks: Buffer[] = [];
    stream.on('data', (c: Buffer) => chunks.push(c));
    stream.on('end', () => resolve(Buffer.concat(chunks)));
    stream.on('error', reject);
    doc.pipe(stream);

    const styleStack: InlineState[] = [{
      bold: false, italic: false, underline: false, strike: false,
    }];
    const listType: ('ul' | 'ol' | null)[] = [];
    const listIndex: number[] = [];
    let pendingNewline = false;
    let skipDepth = 0;

    const top = () => styleStack[styleStack.length - 1];

    const applyFont = () => {
      const s = top();
      let variant: string;
      if (s.mono) {
        variant =
          s.bold && s.italic ? 'Courier-BoldOblique' :
          s.bold ? 'Courier-Bold' :
          s.italic ? 'Courier-Oblique' :
          'Courier';
      } else {
        variant =
          s.bold && s.italic ? 'Helvetica-BoldOblique' :
          s.bold ? 'Helvetica-Bold' :
          s.italic ? 'Helvetica-Oblique' :
          'Helvetica';
      }
      doc.font(variant);
      doc.fontSize(s.fontSize || 11);
    };

    // Track whether the current run started with an alignment override so
    // we apply `align` exactly once per pdfkit text() call (pdfkit uses the
    // align option of the first call in a continued run for the whole line).
    let runStartedAligned = false;

    const writeText = (raw: string) => {
      if (!raw) return;
      if (pendingNewline) {
        doc.moveDown(0.5);
        pendingNewline = false;
      }
      const s = top();
      applyFont();
      const opts: any = {continued: true};