graphql-typed-apollo-client/dist/render/typeGuards/renderTypeGuards.js

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)

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var graphql_1 = require("graphql");
var excludedTypes_1 = require("../common/excludedTypes");
var renderTypeGuard = function (target, possible) { return "\n  const " + target + "_possibleTypes = [" + possible.map(function (t) { return "'" + t + "'"; }).join(',') + "]\n  export const is" + target + " = (obj: { __typename: String }): obj is " + target + " => {\n    if (!obj.__typename) throw new Error('__typename is missing')\n    return " + target + "_possibleTypes.includes(obj.__typename)\n  }\n"; };
exports.renderTypeGuards = function (schema, ctx) {
    for (var name_1 in schema.getTypeMap()) {
        if (excludedTypes_1.excludedTypes.includes(name_1))
            continue;
        var type = schema.getTypeMap()[name_1];
        if (graphql_1.isUnionType(type)) {
            var types = type.getTypes().map(function (t) { return t.name; });
            ctx.addCodeBlock(renderTypeGuard(type.name, types));
        }
        else if (graphql_1.isInterfaceType(type)) {
            var types = schema.getPossibleTypes(type).map(function (t) { return t.name; });
            ctx.addCodeBlock(renderTypeGuard(type.name, types));
        }
        else if (graphql_1.isObjectType(type)) {
            ctx.addCodeBlock(renderTypeGuard(type.name, [type.name]));
        }
    }
};
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