Add types for @styled-system/should-forward-prop (#39129)

types/styled-system__should-forward-prop/index.d.ts

@@ -0,0 +1,10 @@
+// Type definitions for @styled-system/should-forward-prop 5.1
+// Project: https://github.com/styled-system/styled-system/tree/master/packages/should-forward-prop
+// Definitions by: Tom Picton <https://github.com/tpict>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+type genericShouldForwardProp = (prop: string) => boolean;
+
+export function createShouldForwardProp(props: string[]): genericShouldForwardProp;
+declare const shouldForwardProp: genericShouldForwardProp;
+export default shouldForwardProp;

types/styled-system__should-forward-prop/styled-system__should-forward-prop-tests.ts

@@ -0,0 +1,10 @@
+import shouldForwardProp, {
+  createShouldForwardProp
+} from "@styled-system/should-forward-prop";
+
+shouldForwardProp("onClick");  // True
+shouldForwardProp("variant");  // False
+
+const customShouldForwardProp = createShouldForwardProp(["magic"]);
+customShouldForwardProp("magic");  // True
+customShouldForwardProp("you know");  // False

types/styled-system__should-forward-prop/tsconfig.json

@@ -0,0 +1,28 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "paths": {
+            "@styled-system/should-forward-prop": [
+              "styled-system__should-forward-prop"
+            ]
+        },
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "styled-system__should-forward-prop-tests.ts"
+    ]
+}

types/styled-system__should-forward-prop/tslint.json

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