@types/jest: Add inline snapshot matchers (#27258)

Add the following matchers:

- `toMatchInlineSnapshot`
- `toThrowErrorMatchingInlineSnapshot`

types/jest/index.d.ts

@@ -1,4 +1,4 @@
-// Type definitions for Jest 23.1
+// Type definitions for Jest 23.3
 // Project: http://facebook.github.io/jest/
 // Definitions by: Asana <https://asana.com>
 //                 Ivo Stratev <https://github.com/NoHomey>
@@ -15,6 +15,7 @@
 //                 Jeff Lau <https://github.com/UselessPickles>
 //                 Andrew Makarov <https://github.com/r3nya>
 //                 Martin Hochel <https://github.com/hotell>
+//                 Sebastian Sebald <https://github.com/sebald>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -661,6 +662,18 @@ declare namespace jest {
          * Check out [the Snapshot Testing guide](http://facebook.github.io/jest/docs/snapshot-testing.html) for more information.
          */
         toMatchSnapshot(snapshotName?: string): R;
+        /**
+         * This ensures that a value matches the most recent snapshot with property matchers.
+         * Instead of writing the snapshot value to a .snap file, it will be written into the source code automatically.
+         * Check out [the Snapshot Testing guide](http://facebook.github.io/jest/docs/snapshot-testing.html) for more information.
+         */
+        toMatchInlineSnapshot<T extends {[P in keyof R]: Expect['any']}>(propertyMatchers: Partial<T>, snapshot?: string): R;
+        /**
+         * This ensures that a value matches the most recent snapshot with property matchers.
+         * Instead of writing the snapshot value to a .snap file, it will be written into the source code automatically.
+         * Check out [the Snapshot Testing guide](http://facebook.github.io/jest/docs/snapshot-testing.html) for more information.
+         */
+        toMatchInlineSnapshot(snapshot?: string): R;
         /**
          * Ensure that a mock function has returned (as opposed to thrown) at least once.
          */
@@ -689,6 +702,11 @@ declare namespace jest {
          * Used to test that a function throws a error matching the most recent snapshot when it is called.
          */
         toThrowErrorMatchingSnapshot(): R;
+        /**
+         * Used to test that a function throws a error matching the most recent snapshot when it is called.
+         * Instead of writing the snapshot value to a .snap file, it will be written into the source code automatically.
+         */
+        toThrowErrorMatchingInlineSnapshot(snapshot?: string): R;
     }
 
     interface Constructable {

types/jest/jest-tests.ts

@@ -617,6 +617,15 @@ describe("", () => {
             date: new Date(),
         }).toMatchSnapshot({ one: expect.any(Number), date: expect.any(Date) });
 
+        expect({}).toMatchInlineSnapshot();
+        expect({}).toMatchInlineSnapshot("snapshot");
+        expect({ abc: "def" }).toMatchInlineSnapshot({ abc: expect.any(String) }, "snapshot");
+        expect({
+            one: 1,
+            two: "2",
+            date: new Date(),
+        }).toMatchInlineSnapshot({ one: expect.any(Number), date: expect.any(Date) });
+
         expect(jest.fn()).toReturn();
 
         expect(jest.fn()).toReturnTimes(0);
@@ -641,6 +650,15 @@ describe("", () => {
         expect(jest.fn()).toThrowErrorMatchingSnapshot();
         expect(jest.fn(willThrow)).toThrowErrorMatchingSnapshot();
 
+        expect(() => {}).toThrowErrorMatchingInlineSnapshot();
+        expect(() => {}).toThrowErrorMatchingInlineSnapshot('Error Message');
+        expect(willThrow).toThrowErrorMatchingInlineSnapshot();
+        expect(willThrow).toThrowErrorMatchingInlineSnapshot('Error Message');
+        expect(jest.fn()).toThrowErrorMatchingInlineSnapshot();
+        expect(jest.fn()).toThrowErrorMatchingInlineSnapshot('Error Message');
+        expect(jest.fn(willThrow)).toThrowErrorMatchingInlineSnapshot();
+        expect(jest.fn(willThrow)).toThrowErrorMatchingInlineSnapshot('Error Message');
+
         /* not */
 
         expect({}).not.toEqual({});