@theguild/federation-composition/esm/compose.js

Open Source Composition library for Apollo Federation

import { Kind } from 'graphql';
import { print } from './graphql/printer.js';
import { sdl as inaccessibleSDL } from './specifications/inaccessible.js';
import { sdl as joinSDL } from './specifications/join.js';
import { sdl as linkSDL, printLink } from './specifications/link.js';
import { sdl as tagSDL } from './specifications/tag.js';
import { validate } from './validate.js';
export function composeServices(services, __internal) {
    const validationResult = validate(services, __internal);
    if (!validationResult.success) {
        return {
            errors: validationResult.errors,
        };
    }
    const rootTypes = {
        query: false,
        mutation: false,
        subscription: false,
    };
    for (const def of validationResult.supergraph) {
        if (def.name.value === 'Query') {
            rootTypes.query = true;
        }
        else if (def.name.value === 'Mutation') {
            rootTypes.mutation = true;
        }
        else if (def.name.value === 'Subscription') {
            rootTypes.subscription = true;
        }
        if (rootTypes.query === true &&
            rootTypes.mutation === true &&
            rootTypes.subscription === true) {
            break;
        }
    }
    const usedTagSpec = validationResult.specs.tag;
    const usedInaccessibleSpec = validationResult.specs.inaccessible;
    return {
        supergraphSdl: `
schema
  @link(url: "https://specs.apollo.dev/link/v1.0")
  @link(url: "https://specs.apollo.dev/join/v0.3", for: EXECUTION)
  ${usedTagSpec ? '@link(url: "https://specs.apollo.dev/tag/v0.3")' : ''}
  ${usedInaccessibleSpec
            ? '@link(url: "https://specs.apollo.dev/inaccessible/v0.2", for: SECURITY)'
            : ''}
  ${validationResult.links.map(printLink).join('\n  ')}
{
  ${rootTypes.query ? 'query: Query' : ''}
  ${rootTypes.mutation ? 'mutation: Mutation' : ''}
  ${rootTypes.subscription ? 'subscription: Subscription' : ''}
}

${joinSDL}
${linkSDL}
${usedTagSpec ? tagSDL : ''}
${usedInaccessibleSpec ? inaccessibleSDL : ''}

${print({
            kind: Kind.DOCUMENT,
            definitions: validationResult.supergraph,
        })}
    `,
    };
}
export function assertCompositionSuccess(compositionResult, message) {
    if (compositionHasErrors(compositionResult)) {
        throw new Error(message || 'Unexpected test failure');
    }
}
export function assertCompositionFailure(compositionResult, message) {
    if (!compositionHasErrors(compositionResult)) {
        throw new Error(message || 'Unexpected test failure');
    }
}
export function compositionHasErrors(compositionResult) {
    return 'errors' in compositionResult && !!compositionResult.errors;
}