fix: allow to kill onSuccess process using SIGKILL signal, closes #936

src/cli-main.ts

@@ -91,6 +91,10 @@ export async function main(options: Options = {}) {
       'Using Rollup for treeshaking instead, "recommended" or "smallest" or "safest"'
     )
     .option('--publicDir [dir]', 'Copy public directory to output directory')
+    .option(
+      '--killSignal <signal>',
+      'Signal to kill child process, "SIGINT" or "SIGTERM"'
+    )
     .action(async (files: string[], flags) => {
       const { build } = await import('.')
       Object.assign(options, {

src/index.ts

@@ -11,7 +11,7 @@ import execa from 'execa'
 import kill from 'tree-kill'
 import { version } from '../package.json'
 import { createLogger, setSilent } from './log'
-import { NormalizedOptions, Format, Options } from './options'
+import { NormalizedOptions, Format, Options, KILL_SIGNAL } from './options'
 import { runEsbuild } from './esbuild'
 import { shebang } from './plugins/shebang'
 import { cjsSplitting } from './plugins/cjs-splitting'
@@ -34,15 +34,12 @@ export const defineConfig = (
       ) => MaybePromise<Options | Options[]>)
 ) => options
 
-const killProcess = ({
-  pid,
-  signal = 'SIGTERM',
-}: {
-  pid: number
-  signal?: string | number
-}) =>
-  new Promise<unknown>((resolve) => {
-    kill(pid, signal, resolve)
+const killProcess = ({ pid, signal }: { pid: number; signal: KILL_SIGNAL }) =>
+  new Promise<void>((resolve, reject) => {
+    kill(pid, signal, (err) => {
+      if (err) return reject(err)
+      resolve()
+    })
   })
 
 const normalizeOptions = async (
@@ -207,6 +204,7 @@ export async function build(_options: Options) {
               if (onSuccessProcess) {
                 await killProcess({
                   pid: onSuccessProcess.pid,
+                  signal: options.killSignal || 'SIGTERM',
                 })
               } else if (onSuccessCleanup) {
                 await onSuccessCleanup()

src/options.ts

@@ -5,6 +5,8 @@ import type { Plugin } from './plugin'
 import type { TreeshakingStrategy } from './plugins/tree-shaking'
 import type { MinifyOptions } from 'terser'
 
+export type KILL_SIGNAL = 'SIGKILL' | 'SIGTERM'
+
 export type Format = 'cjs' | 'esm' | 'iife'
 
 export type ContextForOutPathGeneration = {
@@ -14,7 +16,7 @@ export type ContextForOutPathGeneration = {
   pkgType?: string
 }
 
-export type OutExtensionObject = { js?: string, dts?: string }
+export type OutExtensionObject = { js?: string; dts?: string }
 
 export type OutExtensionFactory = (
   ctx: ContextForOutPathGeneration
@@ -221,6 +223,7 @@ export type Options = {
    * Copy the files inside `publicDir` to output directory
    */
   publicDir?: string | boolean
+  killSignal?: KILL_SIGNAL
 }
 
 export type NormalizedOptions = Omit<