Add TypeScript type definitions

Author: devongovett

build-prefixes.js

@@ -235,6 +235,15 @@ pub struct Browsers {
 
 fs.writeFileSync('src/targets.rs', targets);
 
+let targets_dts = `// This file is autogenerated by build-prefixes.js. DO NOT EDIT!
+
+export interface Targets {
+  ${Object.keys(browsers).filter(b => !(b in BROWSER_MAPPING)).sort().join(': string,\n  ')}: string
+}
+`;
+
+fs.writeFileSync('node/targets.d.ts', targets_dts);
+
 let s = `// This file is autogenerated by build-prefixes.js. DO NOT EDIT!
 
 use crate::vendor_prefix::VendorPrefix;

node/index.d.ts

@@ -0,0 +1,16 @@
+import type {Targets} from './targets';
+
+export interface TransformOptions {
+  filename: string,
+  code: Buffer,
+  minify: boolean,
+  source_map: boolean,
+  targets: Targets
+}
+
+export interface TransformResult {
+  code: Buffer,
+  map: Buffer
+}
+
+export declare function transform(options: TransformOptions): TransformResult;

node/targets.d.ts

@@ -0,0 +1,13 @@
+// This file is autogenerated by build-prefixes.js. DO NOT EDIT!
+
+export interface Targets {
+  android: string,
+  chrome: string,
+  edge: string,
+  firefox: string,
+  ie: string,
+  ios_saf: string,
+  opera: string,
+  safari: string,
+  samsung: string
+}

package.json

@@ -4,6 +4,7 @@
   "license": "MIT",
   "description": "A CSS parser, transformer, and minifier written in Rust",
   "main": "native.js",
+  "types": "node/index.d.ts",
   "targets": {
     "main": false
   },

test.js

@@ -1,4 +1,4 @@
-const css = require('./native');
+const css = require('./');
 const fs = require('fs');
 
 if (process.argv[process.argv.length - 1] !== __filename) {
@@ -45,4 +45,4 @@ let res = css.transform({
 }
 `)});
 
-console.log(res.toString());
+console.log(res.code.toString());