graphile-utils/node8plus/gql.js

Utilities to help with building graphile-build plugins

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.gql = exports.embed = exports.isEmbed = void 0;
const graphql_1 = require("graphql");
const $$embed = Symbol("graphile-embed");
function isEmbed(obj) {
    return obj && obj[$$embed] === true;
}
exports.isEmbed = isEmbed;
function embed(value) {
    return {
        [$$embed]: true,
        kind: "GraphileEmbed",
        value,
    };
}
exports.embed = embed;
function isGraphQLDocument(input) {
    return (input &&
        typeof input === "object" &&
        input.kind === "Document" &&
        Array.isArray(input.definitions));
}
function gql(strings, ...interpolatedValues) {
    const gqlStrings = [];
    const placeholders = {};
    const additionalDefinitions = [];
    const createPlaceholderFor = (value) => {
        const rand = String(Math.random());
        placeholders[rand] = value;
        return `"${rand}"`;
    };
    for (let idx = 0, length = strings.length; idx < length; idx++) {
        gqlStrings.push(strings[idx]);
        if (idx === length - 1) {
            // NOOP: last string, so no matching interpolatedValue.
        }
        else {
            const interpolatedValue = interpolatedValues[idx];
            if (isEmbed(interpolatedValue)) {
                gqlStrings.push(createPlaceholderFor(interpolatedValue));
            }
            else {
                if (typeof interpolatedValue === "string") {
                    gqlStrings.push(String(interpolatedValue));
                }
                else if (isGraphQLDocument(interpolatedValue)) {
                    additionalDefinitions.push(...interpolatedValue.definitions);
                }
                else {
                    throw new Error(`Placeholder ${idx + 1} is invalid - expected string or GraphQL AST, but received '${typeof interpolatedValue}'. Happened after '${gqlStrings.join("")}'`);
                }
            }
        }
    }
    const ast = (0, graphql_1.parse)(gqlStrings.join(""));
    const visitor = {
        enter: (node) => {
            if (node.kind === "Document") {
                return Object.assign(Object.assign({}, node), { definitions: [...node.definitions, ...additionalDefinitions] });
            }
            else if (node.kind === "Argument") {
                if (node.value.kind === "StringValue") {
                    if (placeholders[node.value.value]) {
                        return Object.assign(Object.assign({}, node), { value: placeholders[node.value.value] });
                    }
                }
            }
            return undefined;
        },
    };
    const astWithPlaceholdersReplaced = (0, graphql_1.visit)(ast, visitor);
    return astWithPlaceholdersReplaced;
}
exports.gql = gql;
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