fix: make node workers cjs

[belom88]

Workers fail for the tile-converter after v4.0.3.

Worker exception: SyntaxError: Cannot use import statement outside a module
(node:160372) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.

If we are in the package type: "module", another error come:

Worker exception: Error: Dynamic require of "stream" is not supported

The solution is to make all node workers with *.cjs extension to handle them as common js.

[ibgreen]

If we are in the package type: "module", another error come

Thanks for looking into this. A quick discussion:

If I have a choice. for node workers, I would prefer focusing on modern apps / es module (type: module), which perhaps just means replacing the dynamic require of stream?

I.e. I would be OK with not having support for CommonJS applications in Node.js

I assume the tile-converter, which is really the only application I know about that uses node workers, is type module?

[ibgreen]

Experimenting with ESM node workers here: #2791, let's see if that approach works first.

[belom88]

If CommonJS is not preferable format I'd fix the tile converter first. It is broken on the latest version. The order for this issue can be:

• Merge this hot fix;
• Make a patch;
• Find a solution for "Worker exception: Error: Dynamic require of "stream" is not supported";
• Build workers with flag --format=esm

[ibgreen]

Sounds good, I agree we need to unbreak it asap.

Find a solution for "Worker exception: Error: Dynamic require of "stream" is not supported";

Since there is no dynamic require of stream in the source code, I was assuming that this happens because the node-workers are transpiled to CommonJS, that is why I put up a PR making all node-workers esm. We can look at that once your patch is out.