Bug in version 2.8.5

[OmarKhattab]

Zip always results in 0 MB

I went back to v2.5.4 and its working fine.

[fl-wxiao]

Since someone has already raised the issue, I won't repeat it again.

After some debugging, I found that the problem probably occurs here(L87):

serverless-layers/src/package/Dependencies.js

Lines 86 to 101 in 842eb7c

	copyProjectFile(filePath, fileName = null) {
	this.init();
	if (!fs.existsSync(filePath)) {
	this.plugin.warn(`[warning] "${filePath}" file does not exists!`);
	return true;
	}
	return new Promise((resolve) => {
	const destFile = path.join(this.layersPackageDir, fileName || path.basename(filePath));
	copyFile(filePath, destFile, (copyErr) => {
	if (copyErr) throw copyErr;
	return resolve();
	});
	});
	}

In this flow, the copyProjectFile method will be called multiple times to copy multiple files. The layersPackageDir directory will be cleaned up after each entry, causing yarn --production to be unable to complete the installation correctly.

[franciszabala]

I compared the source code between 2.7.0 and 2.8.5. It looks like the code in Dependencies.js at line 24 is causing the issue. After removing it, the issue was gone.

Looks like same issue here: #168

Same fix too