graphql-map-selections/lib/mapSelections.js

A package to map selections from graphql resolver info object

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const mapFieldNode = (node) => {
    if (!node)
        return;
    const { kind, name, selectionSet } = node;
    if (kind !== "Field" || name.value.startsWith("__"))
        return {};
    if (!selectionSet)
        return { [name.value]: true };
    return { [name.value]: mapSelectionNodes(selectionSet.selections) };
};
const mapFragmentSpreadNode = (node) => {
    console.log(`${node.kind} parser method not available`);
    return {};
};
const mapInlineFragmentNode = (node) => {
    if (!node)
        return;
    const { kind, typeCondition, selectionSet } = node;
    const { name } = typeCondition;
    if (kind !== "InlineFragment")
        return {};
    if (!selectionSet)
        return { [name.value]: true };
    return { [name.value]: mapSelectionNodes(selectionSet.selections) };
};
const mapNodeStrategies = {
    Field: mapFieldNode,
    FragmentSpread: mapFragmentSpreadNode,
    InlineFragment: mapInlineFragmentNode,
};
const mapSelectionNodes = (selections) => {
    if (!selections)
        return;
    let select = {};
    selections.forEach((s) => {
        const node = mapNodeStrategies[s.kind](s);
        if (node)
            select = Object.assign(Object.assign({}, select), node);
    });
    return select;
};
const mapSelections = (info) => {
    if (!info)
        return;
    const { fieldName, fieldNodes } = info;
    const { selectionSet } = fieldNodes.find((n) => n.name.value === fieldName);
    return selectionSet ? mapSelectionNodes(selectionSet.selections) : {};
};
exports.default = mapSelections;
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