How to use the @theia/filesystem/lib/browser.FileChangeType.DELETED function in @theia/filesystem

continue;
                }
                if (ignoreChangeEvents === true && fileChangeType === FileChangeType.UPDATED) {
                    continue;
                }
                if (ignoreDeleteEvents === true && fileChangeType === FileChangeType.DELETED) {
                    continue;
                }
                const uri = change.uri.toString();
                const codeUri = change.uri['codeUri'];
                if (testGlob(globPattern, uri)) {
                    if (fileChangeType === FileChangeType.ADDED) {
                        onDidCreateEmitter.fire(codeUri);
                    } else if (fileChangeType === FileChangeType.UPDATED) {
                        onDidChangeEmitter.fire(codeUri);
                    } else if (fileChangeType === FileChangeType.DELETED) {
                        onDidDeleteEmitter.fire(codeUri);
                    } else {
                        throw new Error(`Unexpected file change type: ${fileChangeType}.`);
                    }
                }
            }
        }));
        return {

disposables.push(this.fileSystemWatcher.onFilesChanged(changes => {
            for (const change of changes) {
                const fileChangeType = change.type;
                if (ignoreCreateEvents === true && fileChangeType === FileChangeType.ADDED) {
                    continue;
                }
                if (ignoreChangeEvents === true && fileChangeType === FileChangeType.UPDATED) {
                    continue;
                }
                if (ignoreDeleteEvents === true && fileChangeType === FileChangeType.DELETED) {
                    continue;
                }
                const uri = change.uri.toString();
                const codeUri = change.uri['codeUri'];
                if (testGlob(globPattern, uri)) {
                    if (fileChangeType === FileChangeType.ADDED) {
                        onDidCreateEmitter.fire(codeUri);
                    } else if (fileChangeType === FileChangeType.UPDATED) {
                        onDidChangeEmitter.fire(codeUri);
                    } else if (fileChangeType === FileChangeType.DELETED) {
                        onDidDeleteEmitter.fire(codeUri);
                    } else {
                        throw new Error(`Unexpected file change type: ${fileChangeType}.`);
                    }
                }
            }