Add a Config constructor : Config.stringNonEmpty (#3514)

.changeset/hot-dogs-mix.md

@@ -0,0 +1,5 @@
+---
+"effect": minor
+---
+
+New constructor Config.stringNonEmpty

packages/effect/src/Config.ts

@@ -367,6 +367,14 @@ export const hashSet: <A>(config: Config<A>, name?: string) => Config<HashSet.Ha
  */
 export const string: (name?: string) => Config<string> = internal.string
 
+/**
+ * Constructs a config for a non-empty string value.
+ *
+ * @since 3.7.0
+ * @category constructors
+ */
+export const stringNonEmpty: (name?: string) => Config<string> = internal.stringNonEmpty
+
 /**
  * Constructs a config which contains the specified value.
  *

packages/effect/src/internal/config.ts

@@ -447,6 +447,16 @@ export const string = (name?: string): Config.Config<string> => {
   return name === undefined ? config : nested(config, name)
 }
 
+/** @internal */
+export const stringNonEmpty = (name?: string): Config.Config<string> => {
+  const config = primitive(
+    "a non-empty text property",
+    Either.liftPredicate((text) => text.length > 0, () => configError.MissingData([], "Expected a non-empty string"))
+  )
+
+  return name === undefined ? config : nested(config, name)
+}
+
 /** @internal */
 export const all = <const Arg extends Iterable<Config.Config<any>> | Record<string, Config.Config<any>>>(
   arg: Arg

packages/effect/test/Config.test.ts

@@ -66,6 +66,25 @@ describe("Config", () => {
     })
   })
 
+  describe("stringNonEmpty", () => {
+    it("name = undefined", () => {
+      const config = Config.array(Config.stringNonEmpty(), "ITEMS")
+      assertSuccess(config, [["ITEMS", "foo"]], ["foo"])
+      assertFailure(config, [["ITEMS", ""]], ConfigError.MissingData(["ITEMS"], "Expected a non-empty string"))
+    })
+
+    it("name != undefined", () => {
+      const config = Config.stringNonEmpty("NON_EMPTY_STRING")
+      assertSuccess(config, [["NON_EMPTY_STRING", "foo"]], "foo")
+      assertSuccess(config, [["NON_EMPTY_STRING", " "]], " ")
+      assertFailure(
+        config,
+        [["NON_EMPTY_STRING", ""]],
+        ConfigError.MissingData(["NON_EMPTY_STRING"], "Expected a non-empty string")
+      )
+    })
+  })
+
   describe("number", () => {
     it("name = undefined", () => {
       const config = Config.array(Config.number(), "ITEMS")