graphql-typed-client
Version:
A tool that generates a strongly typed client library for any GraphQL endpoint. The client allows writing GraphQL queries as plain JS objects (with type safety, awesome code completion experience, custom scalar type mapping, type guards and more)
34 lines • 1.26 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var lodash_1 = require("lodash");
exports.getFieldFromPath = function (root, path) {
var current;
if (!root)
throw new Error('root type is not provided');
if (path.length === 0)
throw new Error("path is empty");
path.forEach(function (f) {
var type = current ? current.type : root;
if (!type.fields)
throw new Error("type `" + type.name + "` does not have fields");
var possibleTypes = Object.keys(type.fields)
.filter(function (i) { return lodash_1.startsWith(i, 'on_'); })
.reduce(function (types, fieldName) {
var field = type.fields && type.fields[fieldName];
if (field)
types.push(field.type);
return types;
}, [type]);
var field = null;
possibleTypes.forEach(function (type) {
var 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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