diff --git a/sheetify/index.d.ts b/sheetify/index.d.ts
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index 0000000000..d6711c5bd9
--- /dev/null
+++ b/sheetify/index.d.ts
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+// Type definitions for sheetify 6.0
+// Project: https://github.com/stackcss/sheetify
+// Definitions by: Todd Kennedy <https://github.com/toddself>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare namespace sheetify {
+  export function getPrefix(css: string): string;
+}
+
+declare function sheetify(src: string | TemplateStringsArray, filename?: string, options?: {[prop: string]: any}, done?: (err: Error, css: string, prefix: string) => void): string;
+declare function sheetify(src: string | TemplateStringsArray, options: {[prop: string]: any}): void;
+
+export = sheetify;
diff --git a/sheetify/sheetify-tests.ts b/sheetify/sheetify-tests.ts
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+++ b/sheetify/sheetify-tests.ts
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+import * as sheetify from 'sheetify';
+
+function done1 (err: Error, css: string, prefix: string) {};
+function done2 (err: Error, css: string) {};
+function done3 (err: Error) {};
+
+const test1 = sheetify('foobar');
+const test2 = sheetify('foobar', {global: true});
+const test3 = sheetify('foobar', 'beep.css', {global: true});
+const test4 = sheetify('foobar', 'beep.css');
+const test5 = sheetify('foobar', 'beep.css', {global: true}, done1);
+const test6 = sheetify('foobar', 'beep.css', {global: true}, done2);
+const test7 = sheetify('foobar', 'beep.css', {global: true}, done3);
+const test8 = sheetify`
+.test {
+  border: 1px soild black;
+}
+`
+
+const prefix = sheetify.getPrefix('boop');
\ No newline at end of file
diff --git a/sheetify/tsconfig.json b/sheetify/tsconfig.json
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index 0000000000..d3654efcd7
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+++ b/sheetify/tsconfig.json
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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "noImplicitAny": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "sheetify-tests.ts"
+    ]
+}
diff --git a/sheetify/tslint.json b/sheetify/tslint.json
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index 0000000000..377cc837d4
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+++ b/sheetify/tslint.json
@@ -0,0 +1 @@
+{ "extends": "../tslint.json" }