chore: bump v to 8.1.9 (google#917)

* chore: optimize `echo` impl

* chore: bump version to 8.1.9

Author: antongolub

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "zx",
-  "version": "8.1.8",
+  "version": "8.1.9",
   "description": "A tool for writing better scripts",
   "type": "module",
   "main": "./build/index.cjs",

package.json

@@ -15,7 +15,7 @@
 import assert from 'node:assert'
 import { createInterface } from 'node:readline'
 import { $, within, ProcessOutput } from './core.js'
-import { type Duration, isString, parseDuration } from './util.js'
+import { type Duration, isStringLiteral, parseDuration } from './util.js'
 import {
   chalk,
   minimist,
@@ -46,18 +46,11 @@ export async function fetch(url: RequestInfo, init?: RequestInit) {
 
 export function echo(...args: any[]): void
 export function echo(pieces: TemplateStringsArray, ...args: any[]) {
-  let msg
   const lastIdx = pieces.length - 1
-  if (
-    Array.isArray(pieces) &&
-    pieces.every(isString) &&
-    lastIdx === args.length
-  ) {
-    msg =
-      args.map((a, i) => pieces[i] + stringify(a)).join('') + pieces[lastIdx]
-  } else {
-    msg = [pieces, ...args].map(stringify).join(' ')
-  }
+  const msg = isStringLiteral(pieces, ...args)
+    ? args.map((a, i) => pieces[i] + stringify(a)).join('') + pieces[lastIdx]
+    : [pieces, ...args].map(stringify).join(' ')
+
   console.log(msg)
 }