Add mobx-devtools-mst (#25537)

types/mobx-devtools-mst/index.d.ts

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+// Type definitions for mobx-devtools-mst 0.9
+// Project: https://mobxjs.github.io/mobx
+// Definitions by: Alan Plum <https://github.com/pluma>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+declare function makeInspectable(state: object): void;
+export = makeInspectable;

types/mobx-devtools-mst/mobx-devtools-mst-tests.ts

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+import makeInspectable = require("mobx-devtools-mst");
+
+const myModel = {
+    /* some mst instance */
+};
+
+makeInspectable(myModel);

types/mobx-devtools-mst/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", "mobx-devtools-mst-tests.ts"]
+}

types/mobx-devtools-mst/tslint.json

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