function onStringFormat( path ) {
		var node = path.node;
		return node.init &&
			node.init.type === 'CallExpression' &&
			node.init.callee.name === 'require' &&
			node.init.arguments[0].value === '@stdlib/string-format';
	}
Tests whether a variable declaration is for the `@stdlib/string-format` require.

@private
@param {Object} path - AST node path
@returns {boolean} boolean indicating whether a variable declaration is for the `@stdlib/string-format` require