graphile-build-pg/node8plus/plugins/PageInfoStartEndCursor.js

Build a GraphQL schema by reflection over a PostgreSQL schema. Easy to customize since it's built with plugins on graphile-build

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
var PageInfoStartEndCursor = function PageInfoStartEndCursor(builder) {
  builder.hook("GraphQLObjectType:fields", (fields, build, context) => {
    const {
      extend,
      getTypeByName,
      inflection
    } = build;
    const {
      Self,
      fieldWithHooks
    } = context;
    if (Self.name !== inflection.builtin("PageInfo")) {
      return fields;
    }
    const Cursor = getTypeByName("Cursor");
    return extend(fields, {
      startCursor: fieldWithHooks("startCursor", ({
        addDataGenerator
      }) => {
        addDataGenerator(() => ({
          usesCursor: [true]
        }));
        return {
          description: build.wrapDescription("When paginating backwards, the cursor to continue.", "field"),
          type: Cursor
        };
      }, {
        isPageInfoStartCursorField: true
      }),
      endCursor: fieldWithHooks("endCursor", ({
        addDataGenerator
      }) => {
        addDataGenerator(() => ({
          usesCursor: [true]
        }));
        return {
          description: build.wrapDescription("When paginating forwards, the cursor to continue.", "field"),
          type: Cursor
        };
      }, {
        isPageInfoStartCursorField: true
      })
    }, `Adding startCursor/endCursor to ${Self.name}`);
  }, ["PageInfoStartEndCursor"], [], ["Cursor"]);
};
exports.default = PageInfoStartEndCursor;
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