Auto generate TypeScript definition to allow chaining

.gitignore

@@ -2,3 +2,4 @@ node_modules
 .nyc_output
 coverage
 bench/.results
+types/generated.d.ts

lib/runner.js

@@ -198,3 +198,5 @@ Runner.prototype.run = function (options) {
 
 	return Promise.resolve(this.tests.build(this._bail).run()).then(this._buildStats);
 };
+
+Runner._chainableMethods = chainableMethods.chainableMethods;

package.json

@@ -33,18 +33,21 @@
     }
   ],
   "bin": "cli.js",
+  "typings": "types/generated.d.ts",
   "engines": {
     "node": ">=0.10.0"
   },
   "scripts": {
     "test": "xo && nyc --cache --reporter=lcov --reporter=text tap --no-cov --timeout=150 test/*.js test/reporters/*.js",
     "test-win": "tap --no-cov --reporter=classic --timeout=150 test/*.js test/reporters/*.js",
-    "visual": "node test/visual/run-visual-tests.js"
+    "visual": "node test/visual/run-visual-tests.js",
+    "prepublish": "npm run make-ts",
+    "make-ts": "babel-node --presets=babel-preset-es2015 --plugins=transform-runtime types/make.js"
   },
   "files": [
     "lib",
     "*.js",
-    "index.d.ts"
+    "types/generated.d.ts"
   ],
   "keywords": [
     "test",
@@ -153,6 +156,7 @@
     "update-notifier": "^1.0.0"
   },
   "devDependencies": {
+    "babel-cli": "^6.10.1",
     "babel-preset-react": "^6.5.0",
     "cli-table2": "^0.2.0",
     "coveralls": "^2.11.4",
@@ -182,7 +186,9 @@
     },
     "overrides": [
       {
-        "files": ["test/**/*.js"],
+        "files": [
+          "test/**/*.js"
+        ],
         "rules": {
           "max-lines": 0
         }

types/base.d.ts

@@ -0,0 +1,124 @@
+export default test;
+
+export type ErrorValidator
+	= (new (...args: any[]) => any)
+	| RegExp
+	| string
+	| ((error: any) => boolean);
+
+export interface Observable {
+	subscribe(observer: (value: {}) => void): void;
+}
+
+export type Test = (t: TestContext) => PromiseLike<void> | Iterator<any> | Observable | void;
+export type ContextualTest = (t: ContextualTestContext) => PromiseLike<void> | Iterator<any> | Observable | void;
+export type CallbackTest = (t: CallbackTestContext) => void;
+export type ContextualCallbackTest = (t: ContextualCallbackTestContext) => void;
+
+export interface AssertContext {
+	/**
+	 * Passing assertion.
+	 */
+	pass(message?: string): void;
+	/**
+	 * Failing assertion.
+	 */
+	fail(message?: string): void;
+	/**
+	 * Assert that value is truthy.
+	 */
+	truthy(value: any, message?: string): void;
+	/**
+	 * Assert that value is falsy.
+	 */
+	falsy(value: any, message?: string): void;
+	/**
+	 * DEPRECATED, use `truthy`. Assert that value is truthy.
+	 */
+	ok(value: any, message?: string): void;
+	/**
+	 * DEPRECATED, use `falsy`. Assert that value is falsy.
+	 */
+	notOk(value: any, message?: string): void;
+	/**
+	 * Assert that value is true.
+	 */
+	true(value: boolean, message?: string): void;
+	/**
+	 * Assert that value is false.
+	 */
+	false(value: boolean, message?: string): void;
+	/**
+	 * Assert that value is equal to expected.
+	 */
+	is<U>(value: U, expected: U, message?: string): void;
+	/**
+	 * Assert that value is not equal to expected.
+	 */
+	not<U>(value: U, expected: U, message?: string): void;
+	/**
+	 * Assert that value is deep equal to expected.
+	 */
+	deepEqual<U>(value: U, expected: U, message?: string): void;
+	/**
+	 * Assert that value is not deep equal to expected.
+	 */
+	notDeepEqual<U>(value: U, expected: U, message?: string): void;
+	/**
+	 * Assert that function throws an error or promise rejects.
+	 * DEPRECATED, use `deepEqual`. Assert that value is deep equal to expected.
+	 * @param error Can be a constructor, regex, error message or validation function.
+	 */
+	same<U>(value: U, expected: U, message?: string): void;
+ 	/**
+ 	 * DEPRECATED use `notDeepEqual`. Assert that value is not deep equal to expected.
+ 	 */
+ 	notSame<U>(value: U, expected: U, message?: string): void;
+ 	/**
+ 	 * Assert that function throws an error or promise rejects.
+ 	 * @param error Can be a constructor, regex, error message or validation function.
+ 	 */
+	throws(value: PromiseLike<any>, error?: ErrorValidator, message?: string): Promise<any>;
+	throws(value: () => void, error?: ErrorValidator, message?: string): any;
+	/**
+	 * Assert that function doesn't throw an error or promise resolves.
+	 */
+	notThrows<U>(value: PromiseLike<U>, message?: string): Promise<U>;
+	notThrows(value: () => void, message?: string): void;
+	/**
+	 * Assert that contents matches regex.
+	 */
+	regex(contents: string, regex: RegExp, message?: string): void;
+	/**
+	 * Assert that contents does not match regex.
+	 */
+	notRegex(contents, regex, message?: string): void;
+	/**
+	 * Assert that error is falsy.
+	 */
+	ifError(error: any, message?: string): void;
+}
+export interface TestContext extends AssertContext {
+	/**
+	 * Plan how many assertion there are in the test.
+	 * The test will fail if the actual assertion count doesn't match planned assertions.
+	 */
+	plan(count: number): void;
+
+	skip: AssertContext;
+}
+export interface CallbackTestContext extends TestContext {
+	/**
+	 * End the test.
+	 */
+	end(): void;
+}
+export interface ContextualTestContext extends TestContext {
+	context: any;
+}
+export interface ContextualCallbackTestContext extends CallbackTestContext {
+	context: any;
+}
+
+export function test(name: string, run: ContextualTest): void;
+export function test(run: ContextualTest): void;