fix(build): type gen target

package.json

@@ -42,6 +42,7 @@
     "case": "1.6.3",
     "chalk": "4.1.2",
     "commander": "9.4.1",
+    "comment-json": "^4.2.4",
     "eslint": "8.24.0",
     "eslint-plugin-simple-import-sort": "^8.0.0",
     "execa": "5.1.1",

src/build/gen-types.ts

@@ -2,6 +2,7 @@ import execa from 'execa'
 import { join, relative } from 'path'
 
 import { SOURCE_FOLDER } from '../consts'
+import { readTSConfig } from './utils'
 
 export const typesDirectoryName = '_types'
 
@@ -15,13 +16,16 @@ export function getDTSPath(srcScript: string, distPath: string, packageDirectory
 }
 
 export async function generateTypes(outputDirectories: string[]) {
+  const config = await readTSConfig(process.cwd())
+  const target = config?.compilerOptions?.target || 'es5'
+
   for (let i = 0; i < outputDirectories.length; i++) {
     const outputDirectory = outputDirectories[i]
 
     await execa('tsc', [
       '-d',
       '--pretty',
-      '--target', 'es5',
+      '--target', target,
       '--outDir', join(outputDirectory, typesDirectoryName),
       '--skipLibCheck',
       '--declarationMap',

src/build/utils.ts

@@ -1,3 +1,8 @@
+import { parse } from 'comment-json'
+import fs from 'fs'
+import { join } from 'path'
+import { CompilerOptions, ScriptTarget } from 'typescript'
+
 let verbose = false
 
 export function setVerbose(enabled: boolean) {
@@ -14,3 +19,21 @@ export async function safeExec<T>(func: () => Promise<T>, failMessage: string, e
     return error
   }
 }
+
+interface TSConfig {
+  compilerOptions?: Omit<CompilerOptions, 'target'> & {
+    target?: keyof typeof ScriptTarget
+  }
+}
+
+export async function readTSConfig(cwd: string): Promise<null | TSConfig> {
+  const configPath = join(cwd, 'tsconfig.json')
+  const exists = await fs.promises.access(configPath).then(() => true).catch(() => false)
+
+  if (!exists) return null
+
+  const file = await fs.promises.readFile(configPath, 'utf-8')
+  const config = parse(file) as TSConfig
+
+  return config
+}