function getKeyWidth(property) {
			const startToken = sourceCode.getFirstToken(property);
			const endToken = getLastTokenBeforeColon(property.key);

			return getGraphemeCount(
				sourceCode
					.getText()
					.slice(startToken.range[0], endToken.range[1]),
			);
		}
Gets the number of characters in a key, including quotes around string
keys and braces around computed property keys.
@param {ASTNode} property Property of on object literal.
@returns {number} Width of the key.