Question Regarding Restriction on "#/" in Imports Field Key

[suin]

Hello,

I came across the following code snippet in the project and had a question about its implementation:

		if (key.charCodeAt(1) === slashCode) {
			throw new Error(
				`Imports field key should not start with "#/" (key: ${JSON.stringify(
					key
				)})`
			);
		}

https://github.com/webpack/enhanced-resolve/blame/a1976054344a85da8e0e1b2e1611694630e8f97b/lib/util/entrypoints.js#L594-L600

Could you please explain why there is a restriction that the imports field key should not start with "#/"? I reviewed the Node.js documentation on Subpath Imports, but I didn't find any specific mention of such a limitation.

Thank you!