@theguild/federation-composition/esm/supergraph/validation/rules/satisfiablity/helpers.js

Open Source Composition library for Apollo Federation

export function occurrences(str, subString) {
    if (subString.length <= 0) {
        return str.length + 1;
    }
    let n = 0, pos = 0, step = subString.length;
    while (true) {
        pos = str.indexOf(subString, pos);
        if (pos >= 0) {
            ++n;
            pos += step;
        }
        else
            break;
    }
    return n;
}
export function scoreKeyFields(keyFields) {
    const fields = occurrences(keyFields, ' ') + 1;
    const innerSelectionSets = occurrences(keyFields, '{') * 3;
    return fields + innerSelectionSets;
}
export function lazy(factory) {
    let value;
    return {
        get() {
            if (value === undefined) {
                value = factory();
            }
            return value;
        },
        invalidate() {
            value = undefined;
        },
    };
}