How to use the @theia/languages/lib/browser.CompletionItemKind.Interface function in @theia/languages

init(): void {
        this.toDispose.push(this.manager.onDidCreateDebugSession(session => {
            if (this.manager.sessions.length === 1) {
                this.clear();
            }
            session.on('output', event => this.logOutput(session, event));
        }));
        this.completionKinds.set('method', CompletionItemKind.Method);
        this.completionKinds.set('function', CompletionItemKind.Function);
        this.completionKinds.set('constructor', CompletionItemKind.Constructor);
        this.completionKinds.set('field', CompletionItemKind.Field);
        this.completionKinds.set('variable', CompletionItemKind.Variable);
        this.completionKinds.set('class', CompletionItemKind.Class);
        this.completionKinds.set('interface', CompletionItemKind.Interface);
        this.completionKinds.set('module', CompletionItemKind.Module);
        this.completionKinds.set('property', CompletionItemKind.Property);
        this.completionKinds.set('unit', CompletionItemKind.Unit);
        this.completionKinds.set('value', CompletionItemKind.Value);
        this.completionKinds.set('enum', CompletionItemKind.Enum);
        this.completionKinds.set('keyword', CompletionItemKind.Keyword);
        this.completionKinds.set('snippet', CompletionItemKind.Snippet);
        this.completionKinds.set('text', CompletionItemKind.Text);
        this.completionKinds.set('color', CompletionItemKind.Color);
        this.completionKinds.set('file', CompletionItemKind.File);
        this.completionKinds.set('reference', CompletionItemKind.Reference);
        this.completionKinds.set('customcolor', CompletionItemKind.Color);
        if (this.languages.registerCompletionItemProvider) {
            this.toDispose.push(this.languages.registerCompletionItemProvider([DebugConsoleSession.uri], {
                provideCompletionItems: params => this.completions(params)
            }, '.'));