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

A fully-featured caching GraphQL client.

import { Kind } from "graphql";
import { cacheSizes } from "../caching/sizes.js";
import { memoize } from "./memoize.js";
/**
* @internal
* 
* @deprecated This is an internal API and should not be used directly. This can be removed or changed at any time.
*/
const memoized = memoize(function (field) {
    const directive = field.directives?.find((directive) => directive.name.value === "stream");
    if (!directive)
        return false;
    for (const arg of directive.arguments ?? []) {
        if (arg.name.value === "if") {
            switch (arg.value.kind) {
                case Kind.BOOLEAN:
                    return arg.value.value;
                case Kind.VARIABLE: {
                    const varName = arg.value.name.value;
                    return (variables) => !!variables?.[varName];
                }
            }
        }
    }
    return true;
}, {
    max: cacheSizes["isStreamField"] || 2000 /* defaultCacheSizes["isStreamField"] */,
});
/**
* @internal
* 
* @deprecated This is an internal API and should not be used directly. This can be removed or changed at any time.
*/
export function isStreamField(field, variables) {
    const result = memoized(field);
    return typeof result === "function" ? result(variables) : result;
}
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