refactor: use get-tsconfig

README.md

@@ -5,6 +5,12 @@
 
 Convert tsconfig to swc config.
 
+> Why?
+>
+> (https://github.com/swc-project/swc/issues/1348)
+>
+> `swc` has no plans to support `tsconfig.json`, but it could be useful in some cases. For example, migrating from `tsc` to `swc` in a large project, you can use this tool to convert `tsconfig.json` to `.swcrc`, and then modify the `.swcrc` to make it work.
+
 ## Install
 
 ```bash

package.json

@@ -1,13 +1,8 @@
 {
 	"name": "tsconfig-to-swcconfig",
-	"version": "2.6.0",
+	"version": "2.7.0",
 	"description": "Convert tsconfig to swc config",
-	"keywords": [
-		"swc",
-		"tsconfig",
-		"converter",
-		"config"
-	],
+	"keywords": ["swc", "tsconfig", "converter", "config"],
 	"homepage": "https://github.com/Songkeys/tsconfig-to-swcconfig#readme",
 	"bugs": {
 		"url": "https://github.com/Songkeys/tsconfig-to-swcconfig/issues"
@@ -23,9 +18,7 @@
 		"t2s": "dist/cli.js",
 		"tsconfig-to-swcconfig": "dist/cli.js"
 	},
-	"files": [
-		"dist"
-	],
+	"files": ["dist"],
 	"scripts": {
 		"build": "tsc",
 		"format": "biome format . --write",
@@ -39,18 +32,15 @@
 	},
 	"dependencies": {
 		"@fastify/deepmerge": "^1.3.0",
-		"joycon": "^3.1.1",
-		"jsonc-parser": "^3.2.0"
+		"get-tsconfig": "^4.7.2"
 	},
 	"devDependencies": {
 		"@biomejs/biome": "^1.2.2",
 		"@swc/core": "^1.3.89",
 		"@tsconfig/node12": "^12.1.0",
 		"@types/node": "^20.7.0",
 		"@types/source-map-support": "^0.5.8",
-		"prettier": "^3.0.3",
 		"simple-git-hooks": "^2.9.0",
-		"ts-node": "^10.9.1",
 		"typescript": "^5.2.2"
 	}
 }

src/cli.ts

@@ -4,7 +4,6 @@ import { writeFile } from 'node:fs'
 import { parseArgs } from 'node:util'
 import type swcType from '@swc/core'
 import { convert } from './index'
-import { parseParamValue } from './utils'
 
 const {
 	values: { filename, cwd, output, help, set: overrideValues },
@@ -63,7 +62,15 @@ const overrides = overrideValues?.reduce((all, a) => {
 		return o[s]
 	}, all)
 
-	parent[key] = parseParamValue(prop, value)
+	if (value === 'undefined') {
+		parent[key] = undefined
+	} else {
+		try {
+			parent[key] = JSON.parse(value)
+		} catch (_) {
+			parent[key] = value
+		}
+	}
 
 	return all
 }, {} as any) as swcType.Options

src/index.ts

@@ -1,6 +1,6 @@
 import Deepmerge from '@fastify/deepmerge'
 import type swcType from '@swc/core'
-import type tsType from 'typescript'
+import { type TsConfigJson } from 'get-tsconfig'
 import { getTSOptions } from './utils'
 
 const deepmerge = Deepmerge()
@@ -18,7 +18,7 @@ export function convert(
 }
 
 export function convertTsConfig(
-	tsOptions: tsType.CompilerOptions,
+	tsOptions: TsConfigJson.CompilerOptions,
 	swcOptions: swcType.Options = {},
 ): swcType.Options {
 	// https://json.schemastore.org/tsconfig
@@ -92,7 +92,9 @@ export function convertTsConfig(
 const availableModuleTypes = ['commonjs', 'amd', 'umd', 'es6'] as const
 type Module = typeof availableModuleTypes[number]
 
-function moduleType(m: tsType.ModuleKind | undefined): Module {
+function moduleType(
+	m: TsConfigJson.CompilerOptions.Module | undefined,
+): Module {
 	const module = (m as unknown as string)?.toLowerCase()
 	if (availableModuleTypes.includes(module as any)) {
 		return module as Module