Add supports-color typings

supports-color/index.d.ts

@@ -0,0 +1,15 @@
+// Type definitions for supports-color 3.1.2
+// Project: https://github.com/chalk/supports-color
+// Definitions by: Melvin Groenhoff <https://github.com/mgroenhoff>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare interface SupportsColor {
+    level: number;
+    hasBasic: boolean;
+    has256: boolean;
+    has16m: boolean;
+}
+
+declare const supportsColor: boolean & SupportsColor;
+
+export = supportsColor;

supports-color/supports-color-tests.ts

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+import supportsColor = require("supports-color");
+
+if (supportsColor) {
+    // Terminal supports color
+}
+
+if (supportsColor.hasBasic) {
+    // Terminal supports color
+}
+
+if (supportsColor.has256) {
+    // Terminal supports 256 colors
+}
+
+if (supportsColor.has16m) {
+    // Terminal supports 16 million colors (truecolor)
+}

supports-color/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "noImplicitAny": true,
+        "strictNullChecks": false,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "supports-color-tests.ts"
+    ]
+}