@apollo/client/utilities/internal/addDeferFragmentLabels.js

A fully-featured caching GraphQL client.

import { Kind, visit } from "graphql";
import { getDirectiveArgValue } from "./getDirectiveArgValue.js";
const RESERVED_PREFIX = "ac_";
export function addDeferFragmentLabels(document) {
    let count = 0;
    return visit(document, {
        Directive(node) {
            if (node.name.value !== "defer")
                return;
            // Keep user defined labels
            const label = getDirectiveArgValue(node, "label", Kind.STRING);
            if (label && !label.startsWith(RESERVED_PREFIX))
                return;
            const args = node.arguments ?? [];
            const index = args.findIndex((arg) => arg.name.value === "label");
            const labelArg = {
                kind: Kind.ARGUMENT,
                name: { kind: Kind.NAME, value: "label" },
                value: { kind: Kind.STRING, value: RESERVED_PREFIX + count++ },
            };
            return {
                ...node,
                arguments: index === -1 ?
                    [...args, labelArg]
                    : args.map((arg, i) => (i === index ? labelArg : arg)),
            };
        },
    });
}
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