@giraphql/plugin-dataloader/esm/util.js

A GiraphQL plugin for attaching dataloader to object types

import DataLoader from 'dataloader';
import { createContextCache, isThenable } from '@giraphql/core';
export function rejectErrors(val) {
    if (isThenable(val)) {
        return val.then(rejectErrors);
    }
    return val.map((item) => (item instanceof Error ? Promise.reject(item) : item));
}
export function loadAndSort(load, toKey) {
    if (!toKey) {
        return load;
    }
    return async (keys, context) => {
        var _a;
        const list = await load(keys, context);
        const map = new Map();
        const results = new Array();
        for (const val of list) {
            if (val instanceof Error) {
                throw val;
            }
            if (val != null) {
                map.set(toKey(val), val);
            }
        }
        for (let i = 0; i < list.length; i += 1) {
            results[i] = (_a = map.get(keys[i])) !== null && _a !== void 0 ? _a : null;
        }
        return results;
    };
}
export function dataloaderGetter(loaderOptions, load, toKey, sort) {
    const loader = (sort ? loadAndSort(load, typeof sort === "function" ? sort : toKey) : load);
    return createContextCache((context) => new DataLoader((keys) => loader(keys, context), loaderOptions));
}
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