docs(examples): add graphql examples

examples/javascript-graphql/resolve-dates.js

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+const { asDate } = require("@prismicio/helpers/dist/graphql");
+
+// An hypothetic document from Prismic...
+const { graphql: doc } = require("../document.mock.json");
+
+const date = asDate(doc.date);
+console.info({ date: date.toUTCString() });
+
+const timestamp = asDate(doc.timestamp);
+console.info({ timestamp: timestamp.toUTCString() });

examples/javascript-graphql/resolve-links.js

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+const { asLink } = require("@prismicio/helpers/dist/graphql");
+
+// An hypothetic document from Prismic...
+const { graphql: doc } = require("../document.mock.json");
+
+const linkResolver = doc => `/${doc._meta.uid}`;
+
+const relation = asLink(doc.relation, linkResolver);
+console.info({ relation });
+
+const link = asLink(doc.link, linkResolver);
+console.info({ link });
+
+const image = asLink(doc.image, linkResolver);
+console.info({ image });
+
+const file = asLink(doc.file, linkResolver);
+console.info({ file });

examples/typescript-graphql/resolve-dates.ts

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+import { asDate } from "@prismicio/helpers/dist/graphql";
+
+// An hypothetic document from Prismic...
+import { graphql as doc } from "../document.mock.json";
+
+const date = asDate(doc.date);
+console.info({ date: date.toUTCString() });
+
+const timestamp = asDate(doc.timestamp);
+console.info({ timestamp: timestamp.toUTCString() });

examples/typescript-graphql/resolve-links.ts

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+import { asLink, LinkResolverFunction } from "@prismicio/helpers/dist/graphql";
+import { FilledMinimalLinkToDocumentField } from "@prismicio/types/dist/graphql";
+
+// An hypothetic document from Prismic...
+import { graphql as doc } from "../document.mock.json";
+
+interface MyLinkToDocumentField extends FilledMinimalLinkToDocumentField {
+	_meta: {
+		uid: string | null;
+	};
+}
+
+const linkResolver: LinkResolverFunction<MyLinkToDocumentField> = doc =>
+	`/${doc._meta.uid}`;
+
+const relation = asLink(doc.relation, linkResolver);
+console.info({ relation });
+
+const link = asLink(doc.link, linkResolver);
+console.info({ link });
+
+const image = asLink(doc.image, linkResolver);
+console.info({ image });
+
+const file = asLink(doc.file, linkResolver);
+console.info({ file });