feat: replace buildStream w/ buildObjectStreamResponse + use generator

.eslintrc.js

@@ -1,3 +1,20 @@
 module.exports = {
     extends: ['@adamhamlin/eslint-config'],
+    overrides: [
+        {
+            files: ['**/__tests__/**'],
+            plugins: ['jest'],
+            extends: ['plugin:jest/all'],
+            rules: {
+                'jest/prefer-expect-assertions': 'off',
+                'jest/prefer-lowercase-title': 'off',
+                'jest/max-expects': ['error', { max: 8 }],
+                'jest/no-hooks': 'off',
+                'jest/unbound-method': ['error', { ignoreStatic: true }],
+                '@typescript-eslint/unbound-method': 'off', // disable in favor of jest/unbound-method
+                '@typescript-eslint/explicit-function-return-type': 'off',
+                '@typescript-eslint/no-empty-function': 'off',
+            },
+        },
+    ],
 };

.github/workflows/ci.yaml

@@ -10,11 +10,12 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout/install
+      # NOTE: compilation is done as part of the "prepare" script, which is run during npm ci
+      - name: Checkout/install/compile
         uses: adamhamlin/checkout-node-project@v1
 
       - name: Lint
         run: npm run check
 
-      - name: Compile
-        run: npm run compile
+      - name: Tests
+        run: npm test

README.md

@@ -3,7 +3,7 @@
 [![npm version](https://badge.fury.io/js/super-simple-fastify-server.svg)](https://badge.fury.io/js/super-simple-fastify-server)
 [![CI Status Badge](https://github.com/adamhamlin/super-simple-fastify-server/actions/workflows/ci.yaml/badge.svg)](https://github.com/adamhamlin/super-simple-fastify-server/actions/workflows/ci.yaml)
 
-Super-simple Fastify web server! Quickly spin up a server for dev/test without all the bloat and boilerplate:
+Super-simple Fastify web server! Quickly spin up a server for dev/test without all the bloat and boilerplate.
 
 ## Install
 
@@ -64,24 +64,49 @@ See the [Docker README](./readme/DOCKER.md) for more info.
 
 ### Returning response streams
 
-You may want to test a client that consumes a large quantity of data from a response stream. Here is an example using the built-in `buildStream` utility:
+You may want to test a client that consumes a large quantity of data from a JSON response stream. Here is a very simple example using the built-in `buildObjectStreamResponse` utility:
 
+<!-- prettier-ignore -->
 ```ts
-import { FastifyInstance, SimpleFastifyServer, buildStream, sleep } from 'super-simple-fastify-server';
+import { FastifyInstance, SimpleFastifyServer, buildObjectStreamResponse, sleep } from 'super-simple-fastify-server';
 
 const server = new SimpleFastifyServer(async (app: FastifyInstance) => {
     app.get('/hello-world/stream', async function (_request, reply) {
-        const myStream = buildStream(async (stream) => {
-            await sleep(1000);
-            stream.write(JSON.stringify({ first: 'Hello' }));
-            await sleep(500);
-            stream.write(JSON.stringify({ second: ', ' }));
-            await sleep(500);
-            stream.write(JSON.stringify({ third: 'World!' }));
-        });
-
+        async function* myGeneratorFn() {
+            await sleep(2000);
+            yield *[
+                { message: 'Hello' },
+                { message: ', ' },
+                { message: 'World!' }
+            ];
+        }
+        const stream = buildObjectStreamResponse(myGeneratorFn());
         reply.header('Content-Type', 'application/octet-stream');
-        return myStream;
+        return stream;
     });
 });
 ```
+
+And, an example client (using [Axios](https://github.com/axios/axios)) to process the response:
+
+<!-- prettier-ignore -->
+```ts
+import stream from 'stream';
+import { chain } from 'stream-chain';
+import { withParser } from 'stream-json/streamers/StreamValues';
+
+const response = await myAxiosClient.get('/hello-world/stream', { responseType: 'stream' });
+const rawStream: stream.Readable = response.data;
+
+const streamChain = chain([
+    rawStream,
+    withParser(),
+    (parsed) => parsed.value
+]);
+
+let fullMessage = '';
+for await (const obj of streamChain) {
+    fullMessage += obj.message;
+}
+console.log(fullMessage); // Hello, World!
+```

index.ts

@@ -1,3 +1,3 @@
 export { SimpleFastifyServer } from './src/server/server';
 export { FastifyInstance } from 'fastify';
-export { buildStream, sleep } from './src/utils/utils';
+export { buildObjectStreamResponse, sleep } from './src/utils/utils';

jest.config.ts

@@ -0,0 +1,192 @@
+import type { Config } from '@jest/types';
+
+/**
+ * For a detailed explanation regarding each configuration property and type check, visit:
+ * https://jestjs.io/docs/configuration
+ */
+export default async (): Promise<Config.InitialOptions> => ({
+    // All imported modules in your tests should be mocked automatically
+    // automock: false,
+
+    // Automatically clear mock calls, instances and results before every test
+    clearMocks: true,
+
+    // Indicates whether the coverage information should be collected while executing the test
+    collectCoverage: true,
+
+    // An array of glob patterns indicating a set of files for which coverage information should be collected
+    collectCoverageFrom: ['<rootDir>/src/**'],
+
+    // The directory where Jest should output its coverage files (relative to rootDir)
+    coverageDirectory: '<rootDir>/coverage',
+
+    // An array of regexp pattern strings used to skip coverage collection
+    coveragePathIgnorePatterns: ['/__tests__/'],
+
+    // Indicates which provider should be used to instrument code for coverage
+    // coverageProvider: 'v8',
+
+    // A list of reporter names that Jest uses when writing coverage reports
+    // coverageReporters: [
+    //   "json",
+    //   "text",
+    //   "lcov",
+    //   "clover"
+    // ],
+
+    // An object that configures minimum threshold enforcement for coverage results
+    coverageThreshold: {
+        global: {
+            lines: 100,
+            functions: 100,
+            branches: 100,
+            statements: 100,
+        },
+    },
+
+    // A path to a custom dependency extractor
+    // dependencyExtractor: undefined,
+
+    // Make calling deprecated APIs throw helpful error messages
+    // errorOnDeprecated: false,
+
+    // Force coverage collection from ignored files using an array of glob patterns
+    // forceCoverageMatch: [],
+
+    // A path to a module which exports an async function that is triggered once before all test suites
+    // globalSetup: undefined,
+
+    // A path to a module which exports an async function that is triggered once after all test suites
+    // globalTeardown: undefined,
+
+    // A set of global variables that need to be available in all test environments
+    // globals: {},
+
+    // The maximum amount of workers used to run your tests. Can be specified as % or a number. E.g. maxWorkers: 10% will use 10% of your CPU amount + 1 as the maximum worker number. maxWorkers: 2 will use a maximum of 2 workers.
+    maxWorkers: '50%',
+
+    // An array of directory names to be searched recursively up from the requiring module's location
+    // moduleDirectories: [
+    //   "node_modules"
+    // ],
+
+    // An array of file extensions your modules use
+    // moduleFileExtensions: [
+    //   "js",
+    //   "jsx",
+    //   "ts",
+    //   "tsx",
+    //   "json",
+    //   "node"
+    // ],
+
+    // A map from regular expressions to module names or to arrays of module names that allow to stub out resources with a single module
+    // moduleNameMapper: {},
+
+    // An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader
+    // modulePathIgnorePatterns: [],
+
+    // Activates notifications for test results
+    // notify: false,
+
+    // An enum that specifies notification mode. Requires { notify: true }
+    // notifyMode: "failure-change",
+
+    // A preset that is used as a base for Jest's configuration
+    preset: 'ts-jest',
+
+    // Run tests from one or more projects
+    // projects: undefined,
+
+    // Use this configuration option to add custom reporters to Jest
+    // reporters: undefined,
+
+    // Automatically reset mock state before every test
+    // resetMocks: false,
+
+    // Reset the module registry before running each individual test
+    // resetModules: false,
+
+    // A path to a custom resolver
+    // resolver: undefined,
+
+    // Automatically restore mock state and implementation before every test
+    // restoreMocks: false,
+
+    // The root directory that Jest should scan for tests and modules within (relative to current directory)
+    rootDir: './',
+
+    // A list of paths to directories that Jest should use to search for files in (relative to rootDir)
+    roots: ['<rootDir>/src'],
+
+    // Allows you to use a custom runner instead of Jest's default test runner
+    // runner: "jest-runner",
+
+    // The paths to modules that run some code to configure or set up the testing environment before each test
+    // setupFiles: [],
+
+    // A list of paths to modules that run some code to configure or set up the testing framework before each test
+    // setupFilesAfterEnv: [],
+
+    // The number of seconds after which a test is considered as slow and reported as such in the results.
+    slowTestThreshold: 3,
+
+    // A list of paths to snapshot serializer modules Jest should use for snapshot testing
+    // snapshotSerializers: [],
+
+    // The test environment that will be used for testing
+    testEnvironment: 'node',
+
+    // Options that will be passed to the testEnvironment
+    // testEnvironmentOptions: {},
+
+    // Adds a location field to test results
+    // testLocationInResults: false,
+
+    // The glob patterns Jest uses to detect test files
+    testMatch: ['**/__tests__/**/*.(spec|test).ts'],
+
+    // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
+    // testPathIgnorePatterns: [
+    //   "/node_modules/"
+    // ],
+
+    // The regexp pattern or array of patterns that Jest uses to detect test files
+    // testRegex: [],
+
+    // This option allows the use of a custom results processor
+    // testResultsProcessor: undefined,
+
+    // This option allows use of a custom test runner
+    // testRunner: "jest-circus/runner",
+
+    // This option sets the URL for the jsdom environment. It is reflected in properties such as location.href
+    // testURL: "http://localhost",
+
+    // Setting this value to "fake" allows the use of fake timers for functions such as "setTimeout"
+    // timers: "real",
+
+    // Default timeout of a test in milliseconds
+    testTimeout: 5_000,
+
+    // A map from regular expressions to paths to transformers
+    // transform: undefined,
+
+    // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
+    // transformIgnorePatterns: [
+    //   "/node_modules/",
+    //   "\\.pnp\\.[^\\/]+$"
+    // ],
+
+    // An array of regexp pattern strings that are matched against all modules before the module loader will automatically return a mock for them
+    // unmockedModulePathPatterns: undefined,
+
+    // Indicates whether each individual test should be reported during the run
+    // verbose: undefined,
+
+    // An array of regexp patterns that are matched against all source file paths before re-running tests in watch mode
+    // watchPathIgnorePatterns: [],
+
+    // Whether to use watchman for file crawling
+    // watchman: true,
+});