Function calculateBundleSize

packages/python/src/dependency-externalizer.ts:1120–1158

(files: Files)

 * parallel for throughput.
 */
export async function calculateBundleSize(files: Files): Promise<number> {
  let knownSize = 0;
  const statPromises: Promise<number>[] = [];

  for (const filePath of Object.keys(files)) {
    const file = files[filePath];
    if ('fsPath' in file && file.fsPath) {
      const fsRef = file as FileFsRef;
      if (typeof fsRef.size === 'number') {
        // Size already known (populated from RECORD or prior stat).
        knownSize += fsRef.size;
      } else {
        statPromises.push(
          fs.promises
            .stat(fsRef.fsPath)
            .then(stats => stats.size)
            .catch(err => {
              console.warn(
                `Warning: Failed to stat file ${fsRef.fsPath}, size will not be included in bundle calculation: ${err}`
              );
              return 0;
            })
        );
      }
    } else if ('data' in file) {
      // FileBlob with data
      const data = (file as { data: string | Buffer }).data;
      knownSize +=
        typeof data === 'string' ? Buffer.byteLength(data) : data.length;
    }
  }

  const statSizes = await Promise.all(statPromises);
  let totalSize = knownSize;
  for (const s of statSizes) {
    totalSize += s;
  }
  return totalSize;
}

/**
 * Largest-first knapsack packing algorithm.