fix(npm): respect npmrc config (#24001)

packages/opencode/test/npm.test.ts

@@ -1,7 +1,18 @@
+import fs from "fs/promises"
+import path from "path"
 import { describe, expect, test } from "bun:test"
 import { Npm } from "../src/npm"
+import { tmpdir } from "./fixture/fixture"
 
 const win = process.platform === "win32"
+const writePackage = (dir: string, pkg: Record<string, unknown>) =>
+  Bun.write(
+    path.join(dir, "package.json"),
+    JSON.stringify({
+      version: "1.0.0",
+      ...pkg,
+    }),
+  )
 
 describe("Npm.sanitize", () => {
   test("keeps normal scoped package specs unchanged", () => {
@@ -16,3 +27,29 @@ describe("Npm.sanitize", () => {
     expect(Npm.sanitize(spec)).toBe(expected)
   })
 })
+
+describe("Npm.install", () => {
+  test("respects omit from project .npmrc", async () => {
+    await using tmp = await tmpdir()
+
+    await writePackage(tmp.path, {
+      name: "fixture",
+      dependencies: {
+        "prod-pkg": "file:./prod-pkg",
+      },
+      devDependencies: {
+        "dev-pkg": "file:./dev-pkg",
+      },
+    })
+    await Bun.write(path.join(tmp.path, ".npmrc"), "omit=dev\n")
+    await fs.mkdir(path.join(tmp.path, "prod-pkg"))
+    await fs.mkdir(path.join(tmp.path, "dev-pkg"))
+    await writePackage(path.join(tmp.path, "prod-pkg"), { name: "prod-pkg" })
+    await writePackage(path.join(tmp.path, "dev-pkg"), { name: "dev-pkg" })
+
+    await Npm.install(tmp.path)
+
+    await expect(fs.stat(path.join(tmp.path, "node_modules", "prod-pkg"))).resolves.toBeDefined()
+    await expect(fs.stat(path.join(tmp.path, "node_modules", "dev-pkg"))).rejects.toThrow()
+  })
+})