effect-io-ai

Package: effect
Module: ConfigProvider

ConfigProvider.mapInput

Transforms the path segments before they reach the underlying store.

When to use

Use when you need to rename, re-case, or otherwise transform config path segments before lookup.

Details

The function f receives the whole path produced by earlier provider transformations and must return a new path. Lookup path transformations compose in application order: the existing transformation runs first, then f runs. For providers composed with orElse, the transformation is applied to each operand.

Example (Uppercasing path segments)

import { ConfigProvider } from "effect"

const provider = ConfigProvider.fromEnv({
  env: { APP_HOST: "localhost" }
})

const upper = ConfigProvider.mapInput(provider, (path) =>
  path.map((seg) =>
    typeof seg === "string" ? seg.toUpperCase() : seg
  )
)

See

• constantCase – a preset that converts to CONSTANT_CASE
• nested – for prepending a prefix instead of transforming

Signature

declare const mapInput: { (f: (path: Path) => Path): (self: ConfigProvider) => ConfigProvider; (self: ConfigProvider, f: (path: Path) => Path): ConfigProvider; }

Source

Since v4.0.0