chore: convert to typescript

karma.conf.js

@@ -5,12 +5,10 @@ const env = process.env.NODE_ENV;
 
 module.exports = function(karma) {
   const build = builds[0];
+  const buildPlugins = [...build.plugins]
 
   if (env === 'test') {
-    build.plugins = [
-      resolve(),
-      istanbul({exclude: ['node_modules/**/*.js', 'package.json']})
-    ];
+    build.plugins.push(istanbul({exclude: ['node_modules/**/*.js', 'package.json']}));
   }
 
   karma.set({
@@ -24,8 +22,8 @@ module.exports = function(karma) {
       {pattern: './test/fixtures/**/*.png', included: false},
       'node_modules/chart.js/dist/chart.umd.js',
       'test/index.js',
-      'src/index.js',
-      'test/specs/**/*.js'
+      {pattern: 'src/index.ts', type: 'js'},
+      {pattern: 'test/specs/**/*.js', type: 'js'},
     ],
 
     customLaunchers: {
@@ -49,13 +47,11 @@ module.exports = function(karma) {
       'test/fixtures/**/*.js': ['fixtures'],
       'test/specs/**/*.js': ['rollup'],
       'test/index.js': ['rollup'],
-      'src/index.js': ['sources']
+      'src/index.ts': ['sources']
     },
 
     rollupPreprocessor: {
-      plugins: [
-        resolve(),
-      ],
+      plugins: buildPlugins,
       external: [
         'chart.js'
       ],

package.json

@@ -45,7 +45,9 @@
   "homepage": "https://github.com/kurkle/chartjs-chart-sankey#readme",
   "devDependencies": {
     "@rollup/plugin-node-resolve": "^15.3.0",
+    "@rollup/plugin-swc": "^0.4.0",
     "@rollup/plugin-terser": "^0.4.0",
+    "@swc/core": "^1.7.40",
     "@typescript-eslint/eslint-plugin": "^8.11.0",
     "@typescript-eslint/parser": "^8.11.0",
     "chart.js": "^4.0.1",

rollup.config.js

@@ -1,5 +1,6 @@
 const resolve = require('@rollup/plugin-node-resolve').default;
 const terser = require('@rollup/plugin-terser').default;
+const { default: swc } = require('@rollup/plugin-swc');
 const {author, name, version, homepage, main, module: _module, license} = require('./package.json');
 
 const banner = `/*!
@@ -9,8 +10,8 @@ const banner = `/*!
  * Released under the ${license} license
  */`;
 
-const input = 'src/index.js';
-const inputESM = 'src/index.esm.js';
+const input = 'src/index.ts';
+const inputESM = 'src/index.esm.ts';
 const external = [
   'chart.js',
   'chart.js/helpers'
@@ -20,6 +21,19 @@ const globals = {
   'chart.js/helpers': 'Chart.helpers'
 };
 
+const swcOptions = {
+  jsc: {
+    parser: {
+      syntax: 'typescript'
+    },
+    target: 'es2022'
+  },
+  module: {
+    type: 'es6'
+  },
+  sourceMaps: true
+}
+
 module.exports = [
   {
     input,
@@ -32,6 +46,7 @@ module.exports = [
     },
     plugins: [
       resolve(),
+      swc(swcOptions),
     ],
     external
   },
@@ -45,6 +60,7 @@ module.exports = [
     },
     plugins: [
       resolve(),
+      swc(swcOptions),
       terser({
         output: {
           preamble: banner
@@ -63,7 +79,8 @@ module.exports = [
       globals
     },
     plugins: [
-      resolve()
+      resolve(),
+      swc(swcOptions),
     ],
     external
   }