Allow JSON-RPC request params field to be omitted per spec

jest.config.js

@@ -1,6 +1,6 @@
 module.exports = {
  transform: {
- '^.+\\.(ts|tsx)$': '<rootDir>/node_modules/ts-jest/preprocessor.js',
+ '^.+\\.(ts|tsx)$': 'ts-jest',
  },
  moduleFileExtensions: [
  'ts',
@@ -13,5 +13,4 @@ module.exports = {
  '<rootDir>/dist',
  ],
  testEnvironment: 'node',
- mapCoverage: true,
 };

package.json

@@ -23,20 +23,20 @@
  },
  "homepage": "https://github.com/Fitbit/jsonrpc-ts#readme",
  "devDependencies": {
- "@types/jest": "^23.3.5",
- "@types/node": "^10.12.0",
- "io-ts": "^1.0.2",
+ "@types/jest": "^23.3.9",
+ "@types/node": "^10.12.9",
+ "io-ts": "1.4.1",
  "jest": "^23.6.0",
  "ts-jest": "^23.10.4",
  "tslint": "^5.9.1",
- "tslint-config-airbnb": "^5.6.0",
- "typescript": "^3.1.3"
+ "tslint-config-airbnb": "^5.11.1",
+ "typescript": "^3.1.6"
  },
  "dependencies": {
  "@types/error-subclass": "^2.2.0",
  "error-subclass": "^2.2.0"
  },
  "peerDependencies": {
- "io-ts": "^1.0.2"
+ "io-ts": "1.4.1"
  }
 }

src/TypesafeRequestDispatcher.test.ts

@@ -148,12 +148,12 @@ describe('dispatches a request', () => {
  });
 });
 
-it(`returns the request handler function's return value`, () => {
+it('returns the request handler function\'s return value', () => {
  dispatcher.method('yarr', t.any, () => 'avast matey');
  expect(dispatcher.onRequest('yarr', [])).toBe('avast matey');
 });
 
-it(`disallows registering methods beginning with 'rpc.'`, () => {
+it('disallows registering methods beginning with \'rpc.\'', () => {
  const handler = jest.fn();
  expect(() => dispatcher.method('rpc.foo', t.any, handler))
  .toThrow(TypeError);

src/protocol.ts

@@ -51,9 +51,9 @@ export const RequestJSON = t.intersection([
  jsonrpc: t.literal('2.0'),
  method: t.string,
  id: RPCID,
- params: t.union([RPCParams, t.undefined]),
  }),
  t.partial({
+ params: RPCParams,
  result: t.undefined,
  error: t.undefined,
  }),