ARM Template with JSON Comments not working

[trolleyboy]

It seems that deploying ARM Templates that contain JSON comments isn't working. There are 2 parts to this:

Part 1: .jsonc files

When trying to deploy a ARM Template with a .jsonc extension, I get error: Unsupported template file type: <file-path>

Seems to be caused by this line:

bicep-deploy/packages/bicep-deploy-common/src/file.ts

Lines 190 to 192 in 132ee40

	if (templateFile && path.extname(templateFile).toLowerCase() !== ".json") {
	throw new Error(errorMessages.unsupportedTemplateFile(templateFile));
	}

Presumably here too:

bicep-deploy/packages/bicep-deploy-common/src/file.ts

Lines 171 to 173 in 132ee40

	path.extname(parametersFile).toLowerCase() !== ".json"
	) {
	throw new Error(errorMessages.unsupportedParametersFile(parametersFile));

Part 2: Comments in ARM Template JSON

When trying to deploy a ARM Template with inline comments, I get error: Expected double-quoted property name in JSON at position 9230 (line 240 column 36).
Per MS Docs, comments in ARM Templates are supported: https://learn.microsoft.com/en-us/azure/azure-resource-manager/templates/syntax#comments

I believe it's that the JSON.parse doesn't support comments...

bicep-deploy/packages/bicep-deploy-common/src/file.ts

Lines 210 to 211 in 132ee40

	const parametersContents = parameters ? JSON.parse(parameters) : undefined;
	const templateContents = template ? JSON.parse(template) : undefined;

Unfortunately, that's as far as my understanding goes.

[trolleyboy]

Had a go at using Copilot to help resolve this. Refer to PR #318.
Confirmed it's working with a local modified copy of the Action.