feat: allow configure jsc options & use tsconfig build target (#23)

Co-authored-by: EGOIST <0x142857@gmail.com>
Co-authored-by: EGOIST <hi@egoist.sh>

README.md

@@ -94,6 +94,12 @@ Files to include in the transpilation process.
 
 Files to exclude in the transpilation process.
 
+### `options.jsc`
+
+- Type: `object`
+
+Custom [jsc](https://swc.rs/docs/configuration/compilation) options to merge with the default one.
+
 ## Sponsors
 
 [![sponsors](https://sponsors-images.egoist.sh/sponsors.svg)](https://github.com/sponsors/egoist)

package.json

@@ -23,6 +23,8 @@
     "@egoist/prettier-config": "1.0.0",
     "@rollup/pluginutils": "^4.1.1",
     "@swc/core": "^1.2.108",
+    "@types/node": "^17.0.23",
+    "defu": "^6.0.0",
     "esbuild": "0.14.9",
     "esbuild-register": "^3.1.2",
     "joycon": "^3.0.1",

src/index.ts

@@ -1,3 +1,4 @@
+import defu from 'defu'
 import { createUnplugin } from 'unplugin'
 import { createFilter, FilterPattern } from '@rollup/pluginutils'
 
@@ -36,7 +37,7 @@ export default createUnplugin(
 
         const isTs = /\.tsx?$/.test(id)
 
-        const jsc: JscConfig = {
+        let jsc: JscConfig = {
           parser: {
             syntax: isTs ? 'typescript' : 'ecmascript',
           },
@@ -68,6 +69,14 @@ export default createUnplugin(
           })
         }
 
+        if (compilerOptions.target) {
+          jsc.target = compilerOptions.target
+        }
+
+        if (options.jsc) {
+          jsc = defu(options.jsc, jsc)
+        }
+
         const result = await transform(code, {
           filename: id,
           sourceMaps: true,

test/index.test.ts

@@ -1,14 +1,14 @@
-import { test } from 'uvu'
-import assert from 'uvu/assert'
-import path from 'path'
-import swc from '../dist'
-import { rollup } from 'rollup'
+import { test } from "uvu"
+import assert from "uvu/assert"
+import path from "path"
+import swc from "../dist"
+import { rollup } from "rollup"
 
-const fixture = (...args: string[]) => path.join(__dirname, 'fixtures', ...args)
+const fixture = (...args: string[]) => path.join(__dirname, "fixtures", ...args)
 
-test('rollup', async () => {
+test("rollup", async () => {
   const bundle = await rollup({
-    input: fixture('rollup/index.ts'),
+    input: fixture("rollup/index.ts"),
     plugins: [
       swc.rollup({
         tsconfigFile: false,
@@ -17,8 +17,8 @@ test('rollup', async () => {
   })
 
   const { output } = await bundle.generate({
-    format: 'cjs',
-    dir: fixture('rollup/dist'),
+    format: "cjs",
+    dir: fixture("rollup/dist"),
   })
 
   assert.is(
@@ -34,24 +34,24 @@ exports.foo = foo;
   )
 })
 
-test('read tsconfig', async () => {
+test("read tsconfig", async () => {
   const bundle = await rollup({
-    input: fixture('read-tsconfig/index.tsx'),
+    input: fixture("read-tsconfig/index.tsx"),
     plugins: [swc.rollup()],
   })
 
   const { output } = await bundle.generate({
-    format: 'cjs',
-    dir: fixture('read-tsconfig/dist'),
+    format: "cjs",
+    dir: fixture("read-tsconfig/dist"),
   })
 
   const code = output[0].code
-  assert.match(code, 'customJsxFactory')
+  assert.match(code, "customJsxFactory")
 })
 
-test('custom swcrc', async () => {
+test("custom swcrc", async () => {
   const bundle = await rollup({
-    input: fixture('custom-swcrc/index.tsx'),
+    input: fixture("custom-swcrc/index.tsx"),
     plugins: [
       swc.rollup({
         tsconfigFile: false,
@@ -60,17 +60,17 @@ test('custom swcrc', async () => {
   })
 
   const { output } = await bundle.generate({
-    format: 'cjs',
-    dir: fixture('custom-swcrc/dist'),
+    format: "cjs",
+    dir: fixture("custom-swcrc/dist"),
   })
 
   const code = output[0].code
-  assert.match(code, 'customPragma')
+  assert.match(code, "customPragma")
 })
 
-test('minify', async () => {
+test("minify", async () => {
   const bundle = await rollup({
-    input: fixture('minify/index.ts'),
+    input: fixture("minify/index.ts"),
     plugins: [
       swc.rollup({
         minify: true,
@@ -79,14 +79,15 @@ test('minify', async () => {
   })
 
   const { output } = await bundle.generate({
-    format: 'cjs',
-    dir: fixture('minify/dist'),
+    format: "cjs",
+    dir: fixture("minify/dist"),
   })
 
   const code = output[0].code
+  console.log(code)
   assert.match(
     code,
-    `var Foo1=function Foo(){_classCallCheck(this,Foo);this.a=1}`,
+    `var Foo=function Foo(){_classCallCheck(this,Foo);this.a=1}`,
   )
 })