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some edge cases for discussion!
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‎src/execution/__tests__/defer-test.ts

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@@ -431,6 +431,221 @@ describe('Execute: defer directive', () => {
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},
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]);
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});
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it('Can separately emit defer fragments with different labels with varying fields', async () => {
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const document = parse(`
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query HeroNameQuery {
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hero {
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id
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name
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... @defer(label: "DeferID") {
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id
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}
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... @defer(label: "DeferName") {
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name
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}
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}
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}
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`);
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const result = await complete(document);
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expectJSON(result).toDeepEqual([
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{
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data: {
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hero: {
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id: '1',
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name: 'Luke',
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},
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},
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hasNext: true,
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},
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{
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incremental: [
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{
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data: {
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id: '1',
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},
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path: ['hero'],
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label: 'DeferID',
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},
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{
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data: {
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name: 'Luke',
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},
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path: ['hero'],
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label: 'DeferName',
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},
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],
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hasNext: false,
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},
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]);
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});
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it('Does not (yet) separately emit defer fragments with different labels with varying subfields', async () => {
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const document = parse(`
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query HeroNameQuery {
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hero {
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id
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name
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}
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... @defer(label: "DeferID") {
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hero {
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id
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}
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}
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... @defer(label: "DeferName") {
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hero {
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name
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}
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}
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}
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`);
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const result = await complete(document);
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expectJSON(result).toDeepEqual([
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{
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data: {
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hero: {
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id: '1',
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name: 'Luke',
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},
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},
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hasNext: true,
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},
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{
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incremental: [
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{
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data: {
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hero: {
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id: '1',
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name: 'Luke',
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},
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},
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path: [],
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label: 'DeferID',
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},
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{
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data: {
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hero: {
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id: '1',
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name: 'Luke',
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},
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},
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path: [],
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label: 'DeferName',
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},
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],
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hasNext: false,
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},
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]);
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});
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it('Does not (yet) separately emit defer fragments with varying subfields of same priorities but different level of defers', async () => {
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const document = parse(`
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query HeroNameQuery {
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hero {
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id
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name
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}
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hero {
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... @defer(label: "DeferID") {
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id
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}
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}
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... @defer(label: "DeferName") {
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hero {
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name
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}
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}
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}
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`);
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const result = await complete(document);
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expectJSON(result).toDeepEqual([
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{
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data: {
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hero: {
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id: '1',
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name: 'Luke',
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},
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},
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hasNext: true,
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},
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{
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incremental: [
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{
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data: {
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id: '1',
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},
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path: ['hero'],
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label: 'DeferID',
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},
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{
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data: {
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hero: {
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id: '1',
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name: 'Luke',
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},
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},
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path: [],
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label: 'DeferName',
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},
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],
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hasNext: false,
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},
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]);
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});
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it('Does not (yet) separately emit nested defer fragments with varying subfields of same priorities but different level of defers', async () => {
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const document = parse(`
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query HeroNameQuery {
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hero {
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id
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name
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}
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... @defer(label: "DeferName") {
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hero {
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name
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... @defer(label: "DeferID") {
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id
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}
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}
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}
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}
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`);
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const result = await complete(document);
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expectJSON(result).toDeepEqual([
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{
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data: {
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hero: {
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id: '1',
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name: 'Luke',
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},
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},
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hasNext: true,
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},
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{
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incremental: [
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{
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data: {
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id: '1',
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},
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path: ['hero'],
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label: 'DeferID',
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},
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{
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data: {
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hero: {
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id: '1',
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name: 'Luke',
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},
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},
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path: [],
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label: 'DeferName',
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},
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],
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hasNext: false,
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},
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]);
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});
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it('Handles errors thrown in deferred fragments', async () => {
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const document = parse(`
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query HeroNameQuery {

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