build: resolve lint errors

lib/node_modules/@stdlib/_tools/scripts/transform.js

@@ -91,16 +91,8 @@ function transformer( fileInfo, api ) {
 
 	root
 		.find( j.VariableDeclarator )
-		.filter( function onPath( 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';
-		})
-		.forEach( function onPath() {
-			formatVar = path.node.id.name;
-		});
+		.filter( onStringFormat )
+		.forEach( assignFormatVar );
 
 	requires = root.find( j.CallExpression, {
 		'callee': {
@@ -129,6 +121,32 @@ function transformer( fileInfo, api ) {
 
 	return replace( out, RE_INDENT, '\n' );
 
+	/**
+	* 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
+	*/
+	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';
+	}
+
+	/**
+	* Assigns the variable name for the `@stdlib/string-format` require.
+	*
+	* @private
+	* @param {Object} path - AST node path
+	* @returns {void}
+	*/
+	function assignFormatVar( path ) {
+		formatVar = path.node.id.name;
+	}
+
 	/**
 	* Returns false if the node index is equal to zero and true otherwise.
 	*