redux-saga - 如何调试传奇？

Question

如何调试这个问题？我找不到可追踪的信息。

我有以下传奇故事:

    export function* generateSoftwareLicenseCode({distributor, licenseType, duration}: GenerateSoftwareLicenseCodeAction) {
        const username = getUsername();
        const jwtToken = yield call(getJwtToken, username);
    
        const link = new HttpLink({
            uri: getGraphqlEndpointUrl,
            headers: {
                'x-api-key': getApiKey(),
                'Authorization': jwtToken,
            },
        });
        const client = new ApolloClient({
            link: link,
            cache: new InMemoryCache(),
        });
    
        try {
            yield put(setStatusMessage('Generating license code...', 'info'));
    
            yield client.mutate({
                /* tslint:disable */
                mutation: gql`
                    }
                    mutation licensemutation($distributor: String!, licenceType: String!, duration: String, userId: String) {
                        addLicenseCodeOneTimeUsage(distributor: $distributor, licenseType: $licenseType, duration: $duration, userId: $userId) {
                            code
                        }
                    }
                `,
                /* tslint:enable */
                variables: {
                    userId: username,
                    distributor: distributor,
                    licenseType: licenseType,
                    duration: duration,
                },
            });
            const doneMessage = 'License code successfully generated';
            yield put(generateSoftwareLicenseCodeSucceeded(doneMessage));
        } catch (error) {
            const errors = error.networkError.result.errors;
            yield put(generateSoftwareLicenseCodeFailed(filterErrorMessage(errors)));
        }
    }

    export function* softwareLicenseCodesSagas() {
        const generateSoftwareLicenseCodeWatcher = yield takeLatest(GENERATE_SOFTWARE_LICENSE_CODE_ACTION, generateSoftwareLicenseCode);
        yield take(LOCATION_CHANGE);
        yield put(clearMessages());
        yield cancel(generateSoftwareLicenseCodeWatcher);
    }

try block 抛出错误。 catch block 中的错误未定义。

控制台显示uncaught at at at b TypeError:无法读取未定义的属性“结果”

单步执行代码需要我浏览一堆我不理解的库代码。

Answer 1

如果此传奇正在浏览器中执行，您可以像平常一样使用调试器暂停执行并检查变量。如果它在服务器上，console.log 就可以正常工作。

就错误而言，最佳实践是在 saga 中生成已执行函数时始终使用 redux-saga call 方法。因此，您应该将其更改为:

    yield call(client.mutate, options)