Add type definitions for graphql-errors

types/graphql-errors/graphql-errors-tests.ts

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+import { GraphQLSchema, buildSchema } from 'graphql';
+import {
+    UserError,
+    maskErrors,
+    handlerFunction,
+    setDefaultHandler
+} from 'graphql-errors';
+
+// $ExpectType GraphQLSchema
+const schema: GraphQLSchema = buildSchema(`
+  # graphql schema definition
+`);
+
+const customHandler: handlerFunction = err => {
+    return { ...err, message: 'Internal error' };
+};
+
+/**
+ * Mask GraphQL error messages
+ */
+
+// $ExpectType void
+maskErrors(schema);
+
+// $ExpectType void
+maskErrors(schema, customHandler);
+
+// $ExpectError
+maskErrors('schema');
+
+/**
+ * Set callback function that modifies the errors
+ */
+
+// $ExpectType void
+setDefaultHandler(customHandler);
+
+// $ExpectError
+setDefaultHandler();
+
+// $ExpectError
+setDefaultHandler(err => {});
+
+/**
+ * Thrown an user error
+ */
+new UserError("Uh, Houston, we've had a problem");

types/graphql-errors/index.d.ts

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+// Type definitions for graphql-errors 2.1
+// Project: https://github.com/kadirahq/graphql-errors
+// Definitions by: Matías Olivera <https://github.com/MatiasOlivera>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.6
+
+import { GraphQLSchema } from 'graphql';
+
+export type handlerFunction = (err: Error) => Error;
+
+export function setDefaultHandler(fn: handlerFunction): void;
+
+export function maskErrors(schema: GraphQLSchema, fn?: handlerFunction): void;
+
+export class UserError extends Error {
+    constructor(message: string);
+}

types/graphql-errors/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": ["es6", "esnext.asynciterable"],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": ["../"],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "strictFunctionTypes": true
+    },
+    "files": ["index.d.ts", "graphql-errors-tests.ts"]
+}

types/graphql-errors/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }