fix: don't crash on a .npmrc with missing env var

close #5093

.changeset/three-mugs-hide.md

@@ -0,0 +1,6 @@
+---
+"@pnpm/config": patch
+"pnpm": patch
+---
+
+Don't crash when a config file contains a setting with an env variable that doesn't exist [#5093](https://github.com/pnpm/pnpm/issues/5093).

packages/config/package.json

@@ -36,7 +36,7 @@
     "@pnpm/error": "workspace:*",
     "@pnpm/git-utils": "workspace:*",
     "@pnpm/matcher": "workspace:*",
-    "@pnpm/npm-conf": "1.0.5",
+    "@pnpm/npm-conf": "2.0.0",
     "@pnpm/pnpmfile": "workspace:*",
     "@pnpm/read-project-manifest": "workspace:*",
     "@pnpm/types": "workspace:*",

packages/config/src/index.ts

@@ -144,7 +144,6 @@ export default async (
   const env = opts.env ?? process.env
   const packageManager = opts.packageManager ?? { name: 'pnpm', version: 'undefined' }
   const cliOptions = opts.cliOptions ?? {}
-  const warnings = new Array<string>()
 
   if (cliOptions['hoist'] === false) {
     if (cliOptions['shamefully-hoist'] === true) {
@@ -176,7 +175,7 @@ export default async (
     cliOptions['prefix'] = cliOptions.dir // the npm config system still expects `prefix`
   }
   const rcOptionsTypes = { ...types, ...opts.rcOptionsTypes }
-  const npmConfig = loadNpmConf(cliOptions, rcOptionsTypes, {
+  const { config: npmConfig, warnings } = loadNpmConf(cliOptions, rcOptionsTypes, {
     'auto-install-peers': false,
     bail: true,
     color: 'auto',