Method validateInput

src/helpViewer/treeView.ts:391–395

(value: string)

        } else if(cmd === 'filterPackages'){
            // use validation function to continuously update filtered packages
            const validateInput = (value: string) => {
                this.filterText = value;
                this.refresh();
                return '';
            };
            // let user input filter text
            this.filterText = await vscode.window.showInputBox({
                validateInput: validateInput,