feat: update default target to node14

BREAKING CHANGE:

Now tsup requires node 14 or above, the build target is also changed to `node14` by default

package.json

@@ -83,5 +83,8 @@
     "@swc/core": {
       "optional": true
     }
+  },
+  "engines": {
+    "node": ">=14"
   }
 }

src/index.ts

@@ -64,7 +64,7 @@ const normalizeOptions = async (
     ...optionsOverride,
   }
   const options: Buildable<NormalizedOptions> = {
-    target: 'node12',
+    target: 'node14',
     format: ['cjs'],
     outDir: 'dist',
     ..._options,

src/options.ts

@@ -43,7 +43,7 @@ export type Options = {
   /**
    * Compile target
    *
-   * default to `node12`
+   * default to `node14`
    */
   target?: string | string[]
   minify?: boolean

tsup.config.ts

@@ -2,7 +2,7 @@ import { defineConfig } from 'tsup'
 
 export default defineConfig({
   name: 'tsup',
-  target: 'node12.20.0',
+  target: 'node14',
   dts: {
     resolve: true,
     // build types for `src/index.ts` only