no-empty-interface

No tags

No CWE or CVE

An empty interface is equivalent to an empty object ({}).

Normally you cannot directly assign an object literal to a type when the object literal contains more properties than are specified in the type. But in the case of an empty interface, this check is not done, and such assignments will be successful. The result is highly likely to confuse maintainers.

Ast Rule: interface

no-empty-interface

How to write a rule

function visit(node, filename, code) {
	if(node.members.length === 0) {
		const error = buildError(
			node.start.line,
			node.start.col,
			node.end.line,
			node.end.col,
			`An empty interface is equivalent to "{}"`,
			"WARNING",
			"ERROR_PRONE"
		);
		
		addError(error);
	}
}

empty.ts

Expected test result: has error

interface Person {}

not-empty.ts

Expected test result: no error

interface Person {
	name: string;
}

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1 Comment

f
fpena
2/9/2023, 7:19:55 AM
0