Function initWorker

Initializes a custom web worker script. This function is exposed by the @zip.js/zip.js/worker entry point and must be called in the worker script created by Configuration#createWorker or referenced by Configuration#workerURI.

Here is a complete example of a worker script using fflate as the compression engine, e.g. to reduce the bundle size:

import { initWorker } from "@zip.js/zip.js/worker";
import { Deflate, Inflate } from "fflate";

const FORMAT_DEFLATE_RAW = "deflate-raw";

class FflateStream extends TransformStream {
  constructor(codec) {
    super({
      start(controller) {
        codec.ondata = chunk => {
          if (chunk.length) {
            controller.enqueue(chunk);
          }
        };
      },
      transform(chunk) {
        codec.push(chunk);
      },
      flush() {
        codec.push(new Uint8Array(0), true);
      }
    });
  }
}

class CompressionStreamFallback extends FflateStream {
  constructor(format, { level } = {}) {
    checkFormat(format);
    super(new Deflate(level === undefined ? {} : { level }));
  }
}

class DecompressionStreamFallback extends FflateStream {
  constructor(format) {
    checkFormat(format);
    super(new Inflate());
  }
}

function checkFormat(format) {
  if (format != FORMAT_DEFLATE_RAW) {
    throw new TypeError("Unsupported compression format: " + format);
  }
}

initWorker({ CompressionStreamFallback, DecompressionStreamFallback });
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