@gqlts/runtime/dist/client/getFieldFromPath.js

Gqlts runtime client

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.getFieldFromPath = getFieldFromPath;
const tslib_1 = require("tslib");
const lodash_startswith_1 = tslib_1.__importDefault(require("lodash.startswith"));
function getFieldFromPath(root, path) {
    let current;
    if (!root)
        throw new Error('root type is not provided');
    if (path.length === 0)
        throw new Error(`path is empty`);
    path.forEach((f) => {
        const type = current ? current.type : root;
        if (!type.fields)
            throw new Error(`type \`${type.name}\` does not have fields`);
        const possibleTypes = Object.keys(type.fields)
            .filter((i) => (0, lodash_startswith_1.default)(i, 'on_'))
            .reduce((types, fieldName) => {
            const field = type.fields && type.fields[fieldName];
            if (field)
                types.push(field.type);
            return types;
        }, [type]);
        let field = null;
        possibleTypes.forEach((type) => {
            const found = type.fields && type.fields[f];
            if (found)
                field = found;
        });
        if (!field)
            throw new Error(`type \`${type.name}\` does not have a field \`${f}\``);
        current = field;
    });
    return current;
}
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