[gray-percentage] new typings (#38661)

types/gray-percentage/gray-percentage-tests.ts

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+import grayPercentage = require('gray-percentage');
+
+grayPercentage(1);
+grayPercentage(1, 1);
+grayPercentage(1, 'cool');
+grayPercentage(1, 'slate');
+grayPercentage(1, 'warm');
+grayPercentage(1, 1, true);
+
+function testReturnValue(value: string): void {}
+
+testReturnValue(grayPercentage(1));

types/gray-percentage/index.d.ts

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+// Type definitions for gray-percentage 2.0
+// Project: https://github.com/KyleAMathews/gray-percentage
+// Definitions by: Luis Rodrigues <https://github.com/goblindegook>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export = grayPercentage;
+
+declare function grayPercentage(
+    lightness: number,
+    hue?: number | 'cool' | 'slate' | 'warm',
+    darkBackground?: boolean,
+): string;

types/gray-percentage/tsconfig.json

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

types/gray-percentage/tslint.json

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