[jest-specific-snapshot]: New definition.

types/jest-specific-snapshot/index.d.ts

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+// Type definitions for jest-specific-snapshot 0.5
+// Project: https://github.com/igor-dv/jest-specific-snapshot#readme
+// Definitions by: Janeene Beeforth <https://github.com/dawnmist>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.6
+
+/// <reference types="jest" />
+
+declare global {
+    namespace jest {
+        interface Matchers<R> {
+            toMatchSpecificSnapshot(snapshotFilename: string): R;
+        }
+    }
+}
+
+/**
+ * Specify the serializer that should be used by toMatchSpecificSnapshot.
+ * Note: toMatchSpecificSnapshot ignores the existing jest snapshot serializer settings. If you want to use a custom serializer,
+ * you need to set it via this addSerializer function.
+ */
+export function addSerializer(serializer: any): void;
+
+/**
+ * This is used to create a customized version of toMatchSpecificSnapshot.
+ */
+export function toMatchSpecificSnapshot(data: any, snapshotFile: string, testName: string): () => { message(): string; pass: boolean; };

types/jest-specific-snapshot/jest-specific-snapshot-tests.ts

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+import { addSerializer, toMatchSpecificSnapshot } from 'jest-specific-snapshot';
+import toJson from 'enzyme-to-json';
+
+expect(100).toMatchSpecificSnapshot('mySnapshotFile.snap');
+
+addSerializer(toJson);
+
+function doSomeThing(received: any) {
+    return received;
+}
+expect.extend({
+    toMatchDecoratedSpecificSnapshot(received, snapshotFile) {
+        const data = doSomeThing(received);
+        return toMatchSpecificSnapshot.call(this, data, snapshotFile);
+    }
+});

types/jest-specific-snapshot/tsconfig.json

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

types/jest-specific-snapshot/tslint.json

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+{ "extends": "dtslint/dt.json" }