refactor(opencode): replace Bun.which with npm which (#15012)

packages/opencode/test/util/which.test.ts

@@ -0,0 +1,82 @@
+import { describe, expect, test } from "bun:test"
+import fs from "fs/promises"
+import path from "path"
+import { which } from "../../src/util/which"
+import { tmpdir } from "../fixture/fixture"
+
+async function cmd(dir: string, name: string, exec = true) {
+  const ext = process.platform === "win32" ? ".cmd" : ""
+  const file = path.join(dir, name + ext)
+  const body = process.platform === "win32" ? "@echo off\r\n" : "#!/bin/sh\n"
+  await fs.writeFile(file, body)
+  if (process.platform !== "win32") {
+    await fs.chmod(file, exec ? 0o755 : 0o644)
+  }
+  return file
+}
+
+function env(PATH: string): NodeJS.ProcessEnv {
+  return {
+    PATH,
+    PATHEXT: process.env["PATHEXT"],
+  }
+}
+
+function same(a: string | null, b: string) {
+  if (process.platform === "win32") {
+    expect(a?.toLowerCase()).toBe(b.toLowerCase())
+    return
+  }
+
+  expect(a).toBe(b)
+}
+
+describe("util.which", () => {
+  test("returns null when command is missing", () => {
+    expect(which("opencode-missing-command-for-test")).toBeNull()
+  })
+
+  test("finds a command from PATH override", async () => {
+    await using tmp = await tmpdir()
+    const bin = path.join(tmp.path, "bin")
+    await fs.mkdir(bin)
+    const file = await cmd(bin, "tool")
+
+    same(which("tool", env(bin)), file)
+  })
+
+  test("uses first PATH match", async () => {
+    await using tmp = await tmpdir()
+    const a = path.join(tmp.path, "a")
+    const b = path.join(tmp.path, "b")
+    await fs.mkdir(a)
+    await fs.mkdir(b)
+    const first = await cmd(a, "dupe")
+    await cmd(b, "dupe")
+
+    same(which("dupe", env([a, b].join(path.delimiter))), first)
+  })
+
+  test("returns null for non-executable file on unix", async () => {
+    if (process.platform === "win32") return
+
+    await using tmp = await tmpdir()
+    const bin = path.join(tmp.path, "bin")
+    await fs.mkdir(bin)
+    await cmd(bin, "noexec", false)
+
+    expect(which("noexec", env(bin))).toBeNull()
+  })
+
+  test("uses PATHEXT on windows", async () => {
+    if (process.platform !== "win32") return
+
+    await using tmp = await tmpdir()
+    const bin = path.join(tmp.path, "bin")
+    await fs.mkdir(bin)
+    const file = path.join(bin, "pathext.CMD")
+    await fs.writeFile(file, "@echo off\r\n")
+
+    expect(which("pathext", { PATH: bin, PATHEXT: ".CMD" })).toBe(file)
+  })
+})