swc/crates/swc_bundler/tests/.cache/deno/722a85bbc34ef77f799cb2b49aba8aa0cfa5e017.ts
2021-11-09 20:42:49 +09:00

33 lines
1.0 KiB
TypeScript

// Loaded from https://deno.land/x/graphql_deno@v15.0.0/lib/validation/rules/UniqueDirectiveNamesRule.js
import { GraphQLError } from '../../error/GraphQLError.js';
/**
* Unique directive names
*
* A GraphQL document is only valid if all defined directives have unique names.
*/
export function UniqueDirectiveNamesRule(context) {
const knownDirectiveNames = Object.create(null);
const schema = context.getSchema();
return {
DirectiveDefinition(node) {
const directiveName = node.name.value;
if (schema?.getDirective(directiveName)) {
context.reportError(new GraphQLError(`Directive "@${directiveName}" already exists in the schema. It cannot be redefined.`, node.name));
return;
}
if (knownDirectiveNames[directiveName]) {
context.reportError(new GraphQLError(`There can be only one directive named "@${directiveName}".`, [knownDirectiveNames[directiveName], node.name]));
} else {
knownDirectiveNames[directiveName] = node.name;
}
return false;
}
};
}