diff --git a/.changeset/selectconfig-sync-config.md b/.changeset/selectconfig-sync-config.md
new file mode 100644
index 0000000..be4dd5d
--- /dev/null
+++ b/.changeset/selectconfig-sync-config.md
@@ -0,0 +1,20 @@
+---
+"@vlandoss/env": minor
+---
+
+Add `selectConfig(configs)` — a synchronous, runtime-agnostic counterpart to `loadConfig` for config files that can't use top-level `await`.
+
+Some tooling loads its config file via `require()` or by bundling it to CJS, where `await loadConfig(...)` is rejected (`ERR_REQUIRE_ASYNC_MODULE` / "top-level await is not supported with the cjs output format"). `selectConfig` pairs with static `import`s and picks the entry matching `envName()` — no dynamic `import()`, no `await`:
+
+```ts
+import { defineEnv, selectConfig } from "@vlandoss/env";
+import development from "./config/development.ts";
+import production from "./config/production.ts";
+
+export const env = defineEnv({
+  schema: Env,
+  config: selectConfig({ development, production }),
+});
+```
+
+It throws when the current env has no entry. See the new `config-cjs` example and the `loadConfig` guide for details.
diff --git a/docsite/content/docs/api-reference/core.mdx b/docsite/content/docs/api-reference/core.mdx
index 7100a91..6c09472 100644
--- a/docsite/content/docs/api-reference/core.mdx
+++ b/docsite/content/docs/api-reference/core.mdx
@@ -12,6 +12,7 @@ The `@vlandoss/env` entrypoint is the only one you always import — it contains
 | ------------ | -------- | ------------------------------------------------------------------------------------ |
 | `schema`     | Function | Declare the contract — branches and Standard Schema leaves.                          |
 | `defineEnv`  | Function | Merge config + environment variables, validate, and return a typed `env` object.     |
+| `selectConfig` | Function | Synchronously pick the current env's config from a map of statically-imported configs. The no-`await` counterpart to `loadConfig` for config files that tooling loads via `require()` or bundles to CJS. |
 | `envName`    | Function | Detect the current environment name across runtimes — `development`, `production`, … |
 | `readEnv`    | Function | Read raw values from the active source (`process.env` on the server, `window.__env` in the browser). Returns `{}` on runtimes without `process` (Workers) — pass `runtimeEnv` to `defineEnv` instead. |
 | `Config`     | Type     | The input shape of per-environment config files for a given schema.                  |
diff --git a/docsite/content/docs/guides/fs-loadconfig.mdx b/docsite/content/docs/guides/fs-loadconfig.mdx
index 1f9eb90..7a27745 100644
--- a/docsite/content/docs/guides/fs-loadconfig.mdx
+++ b/docsite/content/docs/guides/fs-loadconfig.mdx
@@ -87,8 +87,30 @@ The pattern **must** contain `{env}`, and it throws if the resolved file doesn't
 
 `loadConfig` always reads `envName()`. To load a non-current env, set `ENV=…` in the process env before calling — there's no `env` override on the function itself.
 
+## Config files that can't use top-level `await` (`selectConfig`)
+
+`loadConfig` is async — it uses dynamic `import()` under the hood, which is irreducibly asynchronous. That's fine in app code, but it breaks in **config files that tooling loads synchronously** — files pulled in via `require()` or bundled to CJS, where a top-level `await` is rejected (`ERR_REQUIRE_ASYNC_MODULE`, or a build-time _"top-level await is not supported with the cjs output format"_). Some database/ORM tooling configs fall in this bucket.
+
+There's no runtime-agnostic way to make `loadConfig` synchronous — a sync module load means `require()`, which only exists on CJS-capable runtimes and can't load `.ts` without a transpile hook. So for these files, use **`selectConfig`** instead: the synchronous, runtime-agnostic counterpart. Pair it with **static `import`s** so the runtime/bundler resolves and transpiles each config at parse time — no dynamic import, no `await`:
+
+```ts title="src/env/index.ts (imported by the tool's config file)"
+import { defineEnv, selectConfig } from "@vlandoss/env";
+import development from "./config/development.ts";
+import production from "./config/production.ts";
+import { Env } from "./env/schema.ts";
+
+export const env = defineEnv({
+  schema: Env,
+  config: selectConfig({ development, production }),
+});
+```
+
+`selectConfig` picks the entry matching `envName()` and **throws** if there's none (the map is explicit, so a miss is almost always a typo). Like `loadConfig`, it has no `env` override — set `ENV=…` first to select a non-current env.
+
+See the [`config-cjs` example](https://github.com/variableland/env/tree/main/examples/config-cjs) for a runnable reproduction (it asserts the `loadConfig` + top-level await variant throws under `require()`, and the `selectConfig` variant loads).
+
 ## Tradeoffs
 
 - Requires a runtime with a filesystem — works on Node, Bun, and Deno; not on Workers/Edge. Use the [Vite plugin](/docs/api-reference/vite) for those instead.
 - Loading `.ts` / `.mts` config files depends on the host runtime's TypeScript support: native in Bun and Deno, behind `--experimental-strip-types` in Node ≥22.6 (stable in 23.6). `.js` / `.mjs` / `.json` work everywhere.
-- The startup is async because `loadConfig` is async. If you can't use top-level `await`, hoist the boot into an `async function main()` and call it from your entrypoint.
+- The startup is async because `loadConfig` is async. If you can't use top-level `await`, hoist the boot into an `async function main()` and call it from your entrypoint — or, for config files loaded synchronously by tooling, use [`selectConfig`](#config-files-that-cant-use-top-level-await-selectconfig) with static imports.
diff --git a/examples/README.md b/examples/README.md
index b8176dd..b17b90f 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -1,6 +1,6 @@
 # `@vlandoss/env` examples
 
-Real-world usage examples for [`@vlandoss/env`](../package). **Each example is runtime-isolated**: it declares its own runtime in a local `mise.toml`, brings its own package manager and lockfile, and consumes `@vlandoss/env` from a packed tarball — exactly as an external consumer would. End-to-end tests use Playwright and exercise real `env` failure modes (missing required vars, wrong types, per-mode config isolation, SSR↔client hydration drift).
+Real-world usage examples for [`@vlandoss/env`](../package). **Each example is runtime-isolated**: it declares its own runtime in a local `mise.toml`, brings its own package manager and lockfile, and consumes `@vlandoss/env` from a packed tarball — exactly as an external consumer would. End-to-end tests use Playwright (and `node:test` for the `config-cjs` loader case) and exercise real `env` failure modes (missing required vars, wrong types, per-mode config isolation, SSR↔client hydration drift, config files that can't use top-level await).
 
 | Example                                      | Runtime                                  | Package manager | `env` entries exercised                                                          |
 | -------------------------------------------- | ---------------------------------------- | --------------- | -------------------------------------------------------------------------------- |
@@ -13,8 +13,9 @@ Real-world usage examples for [`@vlandoss/env`](../package). **Each example is r
 | [`spa-vite-dynamic`](./spa-vite-dynamic)     | Node.js (Vite)                           | pnpm            | `@vlandoss/env` (dynamic `import()`) + `@vlandoss/env/vite` (for `__ENV_NAME__`) |
 | [`ssr-react-router`](./ssr-react-router)     | Node.js (React Router 7)                 | pnpm            | `@vlandoss/env` + `@vlandoss/env/fs` + `@vlandoss/env/react` (`<EnvScript />`)   |
 | [`ssr-tanstack-start`](./ssr-tanstack-start) | Node.js (TanStack Start)                 | pnpm            | `@vlandoss/env` + `@vlandoss/env/vite` + `@vlandoss/env/react`                   |
+| [`config-cjs`](./config-cjs)                 | Node.js 22.22.3                          | pnpm            | `@vlandoss/env` (`selectConfig`) + `@vlandoss/env/fs` (`loadConfig`) + `@vlandoss/env/zod` |
 
-The `backend-*`, `worker-*`, and `edge-nextjs` examples drive Playwright in HTTP-only mode (the `request` fixture); the 4 SPA / SSR examples drive a real chromium browser.
+The `backend-*`, `worker-*`, and `edge-nextjs` examples drive Playwright in HTTP-only mode (the `request` fixture); the 4 SPA / SSR examples drive a real chromium browser. `config-cjs` is the odd one out — it runs `node:test` to assert config-file loading semantics under `require()` (no browser, no server).
 
 ## How `@vlandoss/env` is consumed
 
@@ -33,7 +34,7 @@ The tarball is generated by `mise run env:pack` (which calls `pnpm pack` inside
 ```sh
 mise install          # node + pnpm; bun/deno installed per-example as needed
 mise run setup        # bootstraps everything: tools, root deps, env tarball, all examples, Playwright browsers
-mise run test:e2e     # runs all 9 e2e suites
+mise run test:e2e     # runs all 10 e2e suites
 ```
 
 ## Run a single example
diff --git a/examples/config-cjs/.gitignore b/examples/config-cjs/.gitignore
new file mode 100644
index 0000000..3c3629e
--- /dev/null
+++ b/examples/config-cjs/.gitignore
@@ -0,0 +1 @@
+node_modules
diff --git a/examples/config-cjs/README.md b/examples/config-cjs/README.md
new file mode 100644
index 0000000..6e40f29
--- /dev/null
+++ b/examples/config-cjs/README.md
@@ -0,0 +1,54 @@
+# config-cjs
+
+Loading `@vlandoss/env` from a **config file that can't use top-level `await`** —
+the kind of config file that tooling pulls in via `require()` or bundles to CJS
+(e.g. some ORM / database migration tooling).
+
+## The problem
+
+```ts title="db.config.broken.mts"
+const config = await loadConfig(Env); // ⛔ top-level await
+```
+
+`loadConfig` is async (it uses dynamic `import()` under the hood, which is
+irreducibly asynchronous). The top-level `await` makes the module an **async ES
+module**. When a tool loads the config synchronously, that's rejected:
+
+- `require()` → `ERR_REQUIRE_ASYNC_MODULE` (Node ≥22.12, where `require(esm)` is on)
+- esbuild/CJS bundle → _"Top-level await is currently not supported with the cjs output format"_
+
+## The fix: `selectConfig`
+
+`selectConfig` is the synchronous, runtime-agnostic counterpart to `loadConfig`.
+Pair it with **static `import`s** so the runtime/bundler resolves and transpiles
+each config file at parse time — no dynamic import, no `await`:
+
+```ts title="src/env/index.ts"
+import { defineEnv, selectConfig } from "@vlandoss/env";
+import development from "../../config/development.ts";
+import production from "../../config/production.ts";
+import { Env } from "./schema.ts";
+
+export const env = defineEnv({
+  schema: Env,
+  config: selectConfig({ development, production }),
+});
+```
+
+`db.config.mts` imports that `env` and exports a plain config object — no
+top-level await anywhere — so `require()` loads it cleanly.
+
+## Run it
+
+```sh
+mise run //examples/config-cjs:test:e2e
+```
+
+[`test/loader.test.ts`](./test/loader.test.ts) `require()`s both configs and
+asserts: the `selectConfig` one loads, the `loadConfig` + top-level await one
+throws `ERR_REQUIRE_ASYNC_MODULE`.
+
+> Pinned to Node 22.22.3 — `require(esm)` is default from 22.12 and native TS
+> stripping from 22.18, so this is the lowest LTS line where the reproduction
+> (and the fix) behaves as described. Node 20 would throw `ERR_REQUIRE_ESM`
+> instead, which is a different failure.
diff --git a/examples/config-cjs/biome.json b/examples/config-cjs/biome.json
new file mode 100644
index 0000000..5b190a0
--- /dev/null
+++ b/examples/config-cjs/biome.json
@@ -0,0 +1,4 @@
+{
+  "$schema": "https://biomejs.dev/schemas/2.4.15/schema.json",
+  "extends": ["@rrlab/biome-config"]
+}
diff --git a/examples/config-cjs/config/development.ts b/examples/config-cjs/config/development.ts
new file mode 100644
index 0000000..1087937
--- /dev/null
+++ b/examples/config-cjs/config/development.ts
@@ -0,0 +1,6 @@
+import type { EnvConfig } from "../src/env/schema.ts";
+
+export default {
+  server: { PORT: 3001, HOST: "127.0.0.1" },
+  db: { URL: "postgres://localhost/dev", LOGGING: true },
+} satisfies EnvConfig;
diff --git a/examples/config-cjs/config/production.ts b/examples/config-cjs/config/production.ts
new file mode 100644
index 0000000..36f7d90
--- /dev/null
+++ b/examples/config-cjs/config/production.ts
@@ -0,0 +1,6 @@
+import type { EnvConfig } from "../src/env/schema.ts";
+
+export default {
+  server: { PORT: 3001, HOST: "0.0.0.0" },
+  db: { LOGGING: false },
+} satisfies EnvConfig;
diff --git a/examples/config-cjs/db.config.broken.mts b/examples/config-cjs/db.config.broken.mts
new file mode 100644
index 0000000..0c56642
--- /dev/null
+++ b/examples/config-cjs/db.config.broken.mts
@@ -0,0 +1,19 @@
+import { defineEnv } from "@vlandoss/env";
+import { loadConfig } from "@vlandoss/env/fs";
+import { Env } from "./src/env/schema.ts";
+
+// ❌ The pattern that BREAKS in a config file. `loadConfig` is async, so this
+// top-level `await` turns the module into an async ES module. Tooling that
+// loads the config via `require()` throws `ERR_REQUIRE_ASYNC_MODULE`, and
+// bundlers targeting CJS reject the top-level await at build time.
+//
+// Kept here only to demonstrate the failure — see `db.config.mts` for the
+// `selectConfig` fix and `test/loader.test.ts` for the assertion.
+const config = await loadConfig(Env);
+
+const env = defineEnv({ schema: Env, config });
+
+export default {
+  dialect: "postgresql",
+  dbCredentials: { url: env.db.URL },
+} as const;
diff --git a/examples/config-cjs/db.config.mts b/examples/config-cjs/db.config.mts
new file mode 100644
index 0000000..086c000
--- /dev/null
+++ b/examples/config-cjs/db.config.mts
@@ -0,0 +1,14 @@
+import { env } from "./src/env/index.ts";
+
+// Stand-in for an ORM / database tooling config: a file that tooling loads via
+// `require()` or bundles to CJS. Because `env` is built with `selectConfig`
+// (synchronous), importing it here adds no top-level `await`, so this module
+// loads cleanly in a CJS / no-TLA context.
+//
+// Shape the default export however your tool expects — this mirrors a typical
+// database migration config.
+export default {
+  dialect: "postgresql",
+  dbCredentials: { url: env.db.URL },
+  verbose: env.db.LOGGING,
+} as const;
diff --git a/examples/config-cjs/mise.toml b/examples/config-cjs/mise.toml
new file mode 100644
index 0000000..09d0f4c
--- /dev/null
+++ b/examples/config-cjs/mise.toml
@@ -0,0 +1,37 @@
+# Pinned to 22.22.3 on purpose: this example reproduces a `require()`-time
+# failure that only surfaces with `require(esm)` (default since 22.12) AND native
+# TypeScript stripping (default since 22.18). An older 22.x would either resolve
+# the .mts as plain JS (syntax error) or report a different error code.
+[tools]
+node = "22.22.3"
+pnpm = "10.30.3"
+
+[env]
+_.path = ["{{config_root}}/node_modules/.bin"]
+
+[tasks.setup]
+description = "Pack env + install deps (pnpm)"
+depends = ["//:env:pack"]
+sources = [
+  "package.json",
+  "pnpm-lock.yaml",
+  "{{config_root}}/../../package/.local/vlandoss-env.tgz",
+]
+outputs = ["node_modules/.modules.yaml"]
+run = "pnpm install --ignore-workspace --no-frozen-lockfile"
+
+[tasks.reinstall]
+description = "Force-reinstall the env tarball"
+depends = ["//:env:pack"]
+run = "pnpm install --ignore-workspace --no-frozen-lockfile --force"
+
+[tasks."test:e2e"]
+description = "Assert the config loads under require() (selectConfig) and that the loadConfig+TLA variant is rejected"
+depends = ["setup"]
+env = { ENV = "development" }
+run = "node --test test/loader.test.ts"
+
+[tasks.check]
+description = "JS & TS check"
+depends = ["setup"]
+run = "rr check"
diff --git a/examples/config-cjs/package.json b/examples/config-cjs/package.json
new file mode 100644
index 0000000..e0f2561
--- /dev/null
+++ b/examples/config-cjs/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "example-config-cjs",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "dependencies": {
+    "@vlandoss/env": "file:../../package/.local/vlandoss-env.tgz",
+    "zod": "4.3.6"
+  },
+  "devDependencies": {
+    "@biomejs/biome": "^2.0.0",
+    "@rrlab/biome-config": "^0.0.2",
+    "@rrlab/biome-plugin": "^0.1.1",
+    "@rrlab/cli": "0.0.3",
+    "@rrlab/ts-config": "^0.0.2",
+    "@rrlab/ts-plugin": "^0.1.1",
+    "@types/node": "24.12.4",
+    "typescript": "^6.0.0"
+  }
+}
diff --git a/examples/config-cjs/pnpm-lock.yaml b/examples/config-cjs/pnpm-lock.yaml
new file mode 100644
index 0000000..92ce6c3
--- /dev/null
+++ b/examples/config-cjs/pnpm-lock.yaml
@@ -0,0 +1,990 @@
+lockfileVersion: '9.0'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+importers:
+
+  .:
+    dependencies:
+      '@vlandoss/env':
+        specifier: file:../../package/.local/vlandoss-env.tgz
+        version: file:../../package/.local/vlandoss-env.tgz(zod@4.3.6)
+      zod:
+        specifier: 4.3.6
+        version: 4.3.6
+    devDependencies:
+      '@biomejs/biome':
+        specifier: ^2.0.0
+        version: 2.4.15
+      '@rrlab/biome-config':
+        specifier: ^0.0.2
+        version: 0.0.2(@biomejs/biome@2.4.15)
+      '@rrlab/biome-plugin':
+        specifier: ^0.1.1
+        version: 0.1.1(@biomejs/biome@2.4.15)(@pnpm/logger@1001.0.1)(@rrlab/cli@0.0.3(@pnpm/logger@1001.0.1))
+      '@rrlab/cli':
+        specifier: 0.0.3
+        version: 0.0.3(@pnpm/logger@1001.0.1)
+      '@rrlab/ts-config':
+        specifier: ^0.0.2
+        version: 0.0.2(@types/node@24.12.4)(typescript@6.0.3)
+      '@rrlab/ts-plugin':
+        specifier: ^0.1.1
+        version: 0.1.1(@pnpm/logger@1001.0.1)(@rrlab/cli@0.0.3(@pnpm/logger@1001.0.1))(typescript@6.0.3)
+      '@types/node':
+        specifier: 24.12.4
+        version: 24.12.4
+      typescript:
+        specifier: ^6.0.0
+        version: 6.0.3
+
+packages:
+
+  '@babel/code-frame@7.29.7':
+    resolution: {integrity: sha512-Aup7aUOfpbAUg2ROOJN6Iw5f9DMBlzu0mIkm/malLQFN/YQgO48wCj0Kxa3sEHJvPVFg7siR+qRInwXd2qhQKw==}
+    engines: {node: '>=6.9.0'}
+
+  '@babel/helper-string-parser@7.29.7':
+    resolution: {integrity: sha512-Pb5ijPrZ89GDH8223L4UP8i6QApWxs04RbPQJTeWDV0/keR2E36MeKnyr6LYmUUvqRRI+Iv87SuF1W6ErINzYw==}
+    engines: {node: '>=6.9.0'}
+
+  '@babel/helper-validator-identifier@7.29.7':
+    resolution: {integrity: sha512-qehxGkRj55h/ff8EMaJ+cYhyaKlHIxqYDn682wQD7RNp9UujOQsHog2uS0r2vzr4pW+sXf90NeeayjcNaX3fFg==}
+    engines: {node: '>=6.9.0'}
+
+  '@babel/parser@7.29.7':
+    resolution: {integrity: sha512-hnORnjP/1P/zFEndoeX+n+t1RwWRJiJpM/jO7FW32Kn9r5+sJB2JWOdYo4L6k78j15eCwY3Gm/7364B1EMwtNg==}
+    engines: {node: '>=6.0.0'}
+    hasBin: true
+
+  '@babel/types@7.29.7':
+    resolution: {integrity: sha512-4zBIxpPzowiZpusoFkyGVwakdRJUyuH5PxQ/PrqghfdFWWasvnCdPfQXHrenDai+gyLARulZjZowCOj6fjT4pA==}
+    engines: {node: '>=6.9.0'}
+
+  '@bgotink/kdl@0.4.0':
+    resolution: {integrity: sha512-F0uJCjo5FQvFdcGF5QbYVNfcGiRWlocuzyIdQxottZF2+gu6L2xjMGEu9PIpse2hifAca/19vIospgaETCKxIg==}
+
+  '@biomejs/biome@2.4.15':
+    resolution: {integrity: sha512-j5VH3a/h/HXTKBM50MDMxRCzkeLv9S2XJcW2WgnZT1+xyisi+0bISrXR82gCX+8S9lvK0skEvHJRN+3Ktr2hlw==}
+    engines: {node: '>=14.21.3'}
+    hasBin: true
+
+  '@biomejs/cli-darwin-arm64@2.4.15':
+    resolution: {integrity: sha512-rF3PPqLq1yoST79zaQbDjVJwsuIeci/O+9bgNmC5QpgOqz6aqYuzA4abyAGx+mgyiDXn4A049xAN8gijbuR1Qg==}
+    engines: {node: '>=14.21.3'}
+    cpu: [arm64]
+    os: [darwin]
+
+  '@biomejs/cli-darwin-x64@2.4.15':
+    resolution: {integrity: sha512-/5KHXYMfSJs1fNXiX30xFtI8JcCFV6zaVVLxOa0M2sfqBKHkpQhRTv94yxQWxeTY2lzo2OuTlNvPC+hDQt2wcQ==}
+    engines: {node: '>=14.21.3'}
+    cpu: [x64]
+    os: [darwin]
+
+  '@biomejs/cli-linux-arm64-musl@2.4.15':
+    resolution: {integrity: sha512-ZPcxznxm0pogHBLZhYntyR3sR+MrZjqJIKEr7ZqVen0Rl+P/4upVmfYXjftizi9RoqZntg33fv/1fbdhbYXpEQ==}
+    engines: {node: '>=14.21.3'}
+    cpu: [arm64]
+    os: [linux]
+    libc: [musl]
+
+  '@biomejs/cli-linux-arm64@2.4.15':
+    resolution: {integrity: sha512-owaAMZD/T4LrD0ELNCk0Km3qrRHuM0X6EAyVE1FSqGY0rbLoiDLrO4Us2tllm6cAeB2Ioa9C2C08NZPdr8+0Ug==}
+    engines: {node: '>=14.21.3'}
+    cpu: [arm64]
+    os: [linux]
+    libc: [glibc]
+
+  '@biomejs/cli-linux-x64-musl@2.4.15':
+    resolution: {integrity: sha512-CNq/9W38SYSH023lfcQ4KKU8K0YX8T//FZUhcgtMMRABDojx5XsMV7jlweAvGSl389wJQB29Qo6Zb/a+jdvt+w==}
+    engines: {node: '>=14.21.3'}
+    cpu: [x64]
+    os: [linux]
+    libc: [musl]
+
+  '@biomejs/cli-linux-x64@2.4.15':
+    resolution: {integrity: sha512-0jj7THz12GbUOLmMibktK6DZjqz2zV64KFxyBtcFTKPiiOIY0a7vns1elpO1dERvxpsZ5ik0oFfz0oGwFde1+g==}
+    engines: {node: '>=14.21.3'}
+    cpu: [x64]
+    os: [linux]
+    libc: [glibc]
+
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+  picocolors@1.1.1: {}
+
+  picomatch@4.0.4: {}
+
+  pkg-types@2.3.0:
+    dependencies:
+      confbox: 0.2.4
+      exsolve: 1.0.8
+      pathe: 2.0.3
+
+  pkg-types@2.3.1:
+    dependencies:
+      confbox: 0.2.4
+      exsolve: 1.0.8
+      pathe: 2.0.3
+
+  read-yaml-file@2.1.0:
+    dependencies:
+      js-yaml: 4.1.1
+      strip-bom: 4.0.0
+
+  repeat-string@1.6.1: {}
+
+  rimraf@6.1.3:
+    dependencies:
+      glob: 13.0.6
+      package-json-from-dist: 1.0.1
+
+  semver@7.8.1: {}
+
+  signal-exit@4.1.0: {}
+
+  sisteransi@1.0.5: {}
+
+  source-map-js@1.2.1: {}
+
+  split2@4.2.0: {}
+
+  std-env@3.9.0: {}
+
+  strip-bom@4.0.0: {}
+
+  strip-comments-strings@1.2.0: {}
+
+  tinyexec@0.3.2: {}
+
+  tinyexec@1.1.2: {}
+
+  tinyglobby@0.2.16:
+    dependencies:
+      fdir: 6.5.0(picomatch@4.0.4)
+      picomatch: 4.0.4
+
+  typescript@6.0.3: {}
+
+  undici-types@7.16.0: {}
+
+  write-file-atomic@5.0.1:
+    dependencies:
+      imurmurhash: 0.1.4
+      signal-exit: 4.1.0
+
+  write-yaml-file@5.0.0:
+    dependencies:
+      js-yaml: 4.1.1
+      write-file-atomic: 5.0.1
+
+  yaml@2.8.4: {}
+
+  zod@4.3.6: {}
diff --git a/examples/config-cjs/run-run.config.mts b/examples/config-cjs/run-run.config.mts
new file mode 100644
index 0000000..c5cd9f7
--- /dev/null
+++ b/examples/config-cjs/run-run.config.mts
@@ -0,0 +1,7 @@
+import biome from "@rrlab/biome-plugin";
+import { defineConfig } from "@rrlab/cli/config";
+import ts from "@rrlab/ts-plugin";
+
+export default defineConfig({
+  plugins: [biome(), ts()],
+});
diff --git a/examples/config-cjs/src/env/index.ts b/examples/config-cjs/src/env/index.ts
new file mode 100644
index 0000000..eb636d3
--- /dev/null
+++ b/examples/config-cjs/src/env/index.ts
@@ -0,0 +1,20 @@
+import { defineEnv, selectConfig } from "@vlandoss/env";
+import development from "../../config/development.ts";
+import production from "../../config/production.ts";
+import { Env } from "./schema.ts";
+
+// Synchronous config selection — no `loadConfig`, no top-level `await`. This is
+// what lets `db.config.mts` be loaded by tooling that pulls the config in via
+// `require()` or bundles it to CJS, where a top-level await would throw
+// `ERR_REQUIRE_ASYNC_MODULE` / fail the bundle.
+//
+// The configs are static `import`s, so the runtime/bundler resolves and
+// transpiles each one at parse time; `selectConfig` just picks the one matching
+// the current `envName()`.
+export const env = defineEnv({
+  schema: Env,
+  config: selectConfig({ development, production }),
+  vars: {
+    db: { URL: "DATABASE_URL" },
+  },
+});
diff --git a/examples/config-cjs/src/env/schema.ts b/examples/config-cjs/src/env/schema.ts
new file mode 100644
index 0000000..ff7538b
--- /dev/null
+++ b/examples/config-cjs/src/env/schema.ts
@@ -0,0 +1,13 @@
+import { type Config, schema } from "@vlandoss/env";
+import * as e from "@vlandoss/env/zod";
+import * as z from "zod";
+
+export const Env = schema({
+  server: { PORT: e.port, HOST: e.host },
+  db: {
+    URL: z.url(),
+    LOGGING: e.bool.default(false),
+  },
+});
+
+export type EnvConfig = Config<typeof Env>;
diff --git a/examples/config-cjs/test/loader.test.ts b/examples/config-cjs/test/loader.test.ts
new file mode 100644
index 0000000..dc802a1
--- /dev/null
+++ b/examples/config-cjs/test/loader.test.ts
@@ -0,0 +1,23 @@
+import assert from "node:assert/strict";
+import { createRequire } from "node:module";
+import { describe, it } from "node:test";
+
+// A real CJS `require`, the way some tooling pulls in its config file. On Node
+// ≥22.18 `require()` loads ES modules and strips TypeScript, but it still
+// refuses an ES module graph that uses top-level await.
+const require = createRequire(import.meta.url);
+
+describe("config file loading in a CJS / no-top-level-await context", () => {
+  it("selectConfig (sync) loads fine via require()", () => {
+    const mod = require("../db.config.mts") as { default: { dialect: string; dbCredentials: { url: string } } };
+    assert.equal(mod.default.dialect, "postgresql");
+    assert.equal(mod.default.dbCredentials.url, "postgres://localhost/dev");
+  });
+
+  it("loadConfig + top-level await throws ERR_REQUIRE_ASYNC_MODULE via require()", () => {
+    assert.throws(
+      () => require("../db.config.broken.mts"),
+      (err: NodeJS.ErrnoException) => err.code === "ERR_REQUIRE_ASYNC_MODULE",
+    );
+  });
+});
diff --git a/examples/config-cjs/tsconfig.json b/examples/config-cjs/tsconfig.json
new file mode 100644
index 0000000..880ca9a
--- /dev/null
+++ b/examples/config-cjs/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "@rrlab/ts-config/no-dom/app",
+  "include": ["src", "test", "config", "db.config.mts", "db.config.broken.mts"]
+}
diff --git a/mise.toml b/mise.toml
index 584a5ae..dbd53ca 100644
--- a/mise.toml
+++ b/mise.toml
@@ -20,6 +20,7 @@ config_roots = [
   "examples/spa-vite-dynamic",
   "examples/ssr-react-router",
   "examples/ssr-tanstack-start",
+  "examples/config-cjs",
 ]
 
 [tasks.setup]
diff --git a/package/src/__tests__/lib.test-d.ts b/package/src/__tests__/lib.test-d.ts
index 4439c8e..bbd3e26 100644
--- a/package/src/__tests__/lib.test-d.ts
+++ b/package/src/__tests__/lib.test-d.ts
@@ -1,7 +1,7 @@
 import { assertType, describe, expectTypeOf, test } from "vitest";
 import * as z from "zod";
 import type { AssertEnvVarNames, Config, Defaults, Env, Vars } from "../lib/index.ts";
-import { defineEnv, schema } from "../lib/index.ts";
+import { defineEnv, schema, selectConfig } from "../lib/index.ts";
 
 const S = schema({
   server: { PORT: z.coerce.number(), HOST: z.string() },
@@ -136,3 +136,18 @@ describe("defineEnv() return type overloads", () => {
     defineEnv({ schema: S, config: "src/config/*.ts" });
   });
 });
+
+describe("selectConfig()", () => {
+  const development: Config<typeof S> = { server: { PORT: 3000, HOST: "x" } };
+  const production: Config<typeof S> = { server: { PORT: 8080, HOST: "y" } };
+
+  test("returns the map's value type (T), never `T | undefined`", () => {
+    const config = selectConfig({ development, production });
+    expectTypeOf(config).toEqualTypeOf<Config<typeof S>>();
+  });
+
+  test("result pipes into defineEnv as a sync config -> Env<S>", () => {
+    const env = defineEnv({ schema: S, config: selectConfig({ development, production }) });
+    expectTypeOf(env).toEqualTypeOf<Env<typeof S>>();
+  });
+});
diff --git a/package/src/__tests__/select-config.test.ts b/package/src/__tests__/select-config.test.ts
new file mode 100644
index 0000000..49351bb
--- /dev/null
+++ b/package/src/__tests__/select-config.test.ts
@@ -0,0 +1,56 @@
+import { afterEach, describe, expect, it } from "vitest";
+import * as z from "zod";
+import { defineEnv, schema, selectConfig } from "../lib/index.ts";
+
+const S = schema({
+  server: { PORT: z.coerce.number().int(), HOST: z.string() },
+});
+
+const development = { server: { PORT: 3000, HOST: "localhost" } };
+const production = { server: { PORT: 8080, HOST: "0.0.0.0" } };
+
+afterEach(() => {
+  delete process.env.ENV;
+});
+
+describe("selectConfig", () => {
+  it("returns the config for the current env (envName)", () => {
+    process.env.ENV = "development";
+    expect(selectConfig({ development, production })).toBe(development);
+  });
+
+  it("respects ENV when selecting", () => {
+    process.env.ENV = "production";
+    expect(selectConfig({ development, production })).toBe(production);
+  });
+
+  it("supports custom env names", () => {
+    process.env.ENV = "staging";
+    const staging = { server: { PORT: 5000, HOST: "staging.local" } };
+    expect(selectConfig({ development, staging })).toBe(staging);
+  });
+
+  it("throws listing available keys when the current env has no entry", () => {
+    process.env.ENV = "staging";
+    expect(() => selectConfig({ development, production })).toThrow(
+      'selectConfig: no config for env "staging". Available: development, production.',
+    );
+  });
+
+  it("reports (none) when the map is empty", () => {
+    process.env.ENV = "development";
+    expect(() => selectConfig({})).toThrow('selectConfig: no config for env "development". Available: (none).');
+  });
+
+  it("pipes into defineEnv as the (sync) config source", () => {
+    process.env.ENV = "production";
+    const env = defineEnv({
+      schema: S,
+      config: selectConfig({ development, production }),
+      runtimeEnv: {},
+    });
+    // selectConfig read process.env.ENV and picked the production config
+    expect(env.server.PORT).toBe(8080);
+    expect(env.server.HOST).toBe("0.0.0.0");
+  });
+});
diff --git a/package/src/lib/index.ts b/package/src/lib/index.ts
index b0280a6..859e789 100644
--- a/package/src/lib/index.ts
+++ b/package/src/lib/index.ts
@@ -2,6 +2,7 @@ export { ENV_GLOBAL_ID, ENV_SCRIPT_ID } from "./const.ts";
 export { defineEnv } from "./define-env.ts";
 export { envName, readEnv } from "./runtime.ts";
 export { schema } from "./schema.ts";
+export { selectConfig } from "./select-config.ts";
 
 export type {
   AssertEnvVarNames,
diff --git a/package/src/lib/select-config.ts b/package/src/lib/select-config.ts
new file mode 100644
index 0000000..e06d358
--- /dev/null
+++ b/package/src/lib/select-config.ts
@@ -0,0 +1,32 @@
+import { envName } from "./runtime.ts";
+
+/**
+ * Synchronously pick the config for the current environment from a map keyed by
+ * env name. The sync, runtime-agnostic counterpart to `loadConfig` for config
+ * files that can't use top-level `await` — files that tooling loads via
+ * `require()` or bundles to CJS, where top-level await is rejected
+ * (`ERR_REQUIRE_ASYNC_MODULE`).
+ *
+ * Pair it with static `import`s so the bundler/runtime resolves and transpiles
+ * each config file at parse time — no dynamic `import()`, no `await`:
+ *
+ * ```ts
+ * import development from "./config/development.ts";
+ * import production from "./config/production.ts";
+ *
+ * const config = selectConfig({ development, production });
+ * ```
+ *
+ * Selects by `envName()`. Throws when the current env has no entry — the map is
+ * explicit, so a miss is almost always a typo or a forgotten environment. To
+ * select a non-current env, set `ENV=…` in the process env first (same rule as
+ * `loadConfig`).
+ */
+export function selectConfig<T>(configs: Record<string, T>): T {
+  const env = envName();
+  if (!Object.hasOwn(configs, env)) {
+    const available = Object.keys(configs).join(", ") || "(none)";
+    throw new Error(`selectConfig: no config for env "${env}". Available: ${available}.`);
+  }
+  return configs[env] as T;
+}