add typings for react-native-form (#35568)

* add typings for react-native-form

* add typescript version

* fix linting issues

types/react-native-form/index.d.ts

@@ -0,0 +1,21 @@
+// Type definitions for react-native-form 2.1
+// Project: https://github.com/julianocomg/react-native-form#readme
+// Definitions by: Mark Nelissen <https://github.com/marknelissen>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.4
+
+import { Component } from 'react';
+import { ViewProps } from 'react-native';
+
+export interface FormProps extends ViewProps {
+    customFields?: {
+        [key: string]: {
+            callbackProp: string;
+            controlled: boolean;
+            valueProp: string;
+        }
+    };
+    ref: string;
+}
+
+export default class Form extends Component<FormProps> { }

types/react-native-form/react-native-form-tests.tsx

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+import * as React from 'react';
+import Form from 'react-native-form';
+
+function FormView() {
+    return <Form ref="form"></Form>;
+}
+
+const customFields = {
+    RadioButtons: {
+        controlled: true,
+        valueProp: 'selectedOption',
+        callbackProp: 'onSelection',
+    }
+};
+
+function FormViewWithCustomField() {
+    return <Form ref="form" customFields={customFields}></Form>;
+}
+
+function FormViewWithViewProps() {
+    return <Form ref="form" style={{ flex: 1 }}></Form>;
+}

types/react-native-form/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,
+        "jsx": "react"
+    },
+    "files": [
+        "index.d.ts",
+        "react-native-form-tests.tsx"
+    ]
+}

types/react-native-form/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }