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Releases

@effect/language-service@0.85.0

Minor Changes

• #720 4229bb9 Thanks @mattiamanzati! - Add the nestedEffectGenYield diagnostic to detect yield* Effect.gen(...) inside an existing Effect generator context.

  Example:

  Effect.gen(function* () {
    yield* Effect.gen(function* () {
      yield* Effect.succeed(1);
    });
  });

• #723 da9cc4b Thanks @mattiamanzati! - Add the effectMapFlatten style diagnostic for Effect.map(...) immediately followed by Effect.flatten in pipe flows.

  Example:

  import { Effect } from "effect";
  
  const program = Effect.succeed(1).pipe(
    Effect.map((n) => Effect.succeed(n + 1)),
    Effect.flatten
  );

• #718 0af7c0f Thanks @mattiamanzati! - Add the lazyPromiseInEffectSync diagnostic to catch Effect.sync(() => Promise...) patterns and suggest using Effect.promise or Effect.tryPromise for async work.

  Example:

  Effect.sync(() => Promise.resolve(1));

• #714 32985b2 Thanks @mattiamanzati! - Add processEnv and processEnvInEffect diagnostics to guide process.env.* reads toward Effect Config APIs.

  Examples:

  • process.env.PORT
  • process.env["API_KEY"]

• #721 f05ae89 Thanks @mattiamanzati! - Add the unnecessaryArrowBlock style diagnostic for arrow functions whose block body only returns an expression.

  Example:

  const trim = (value: string) => {
    return value.trim();
  };

• #717 b77848a Thanks @mattiamanzati! - Add newPromise and asyncFunction effect-native diagnostics to report manual Promise construction and async function declarations, with guidance toward Effect-based async control flow.

• #722 6f19858 Thanks @mattiamanzati! - Add the effectDoNotation style diagnostic for Effect.Do usage and suggest migrating to Effect.gen or Effect.fn.

  Example:

  import { pipe } from "effect/Function";
  import { Effect } from "effect";
  
  const program = pipe(
    Effect.Do,
    Effect.bind("a", () => Effect.succeed(1)),
    Effect.let("b", ({ a }) => a + 1)
  );

• #716 c3f67b0 Thanks @mattiamanzati! - Add cryptoRandomUUID and cryptoRandomUUIDInEffect diagnostics for Effect v4 to discourage crypto.randomUUID() in favor of the Effect Random module, which uses Effect-injected randomness instead of the global crypto implementation.

Patch Changes

• #719 d23980a Thanks @mattiamanzati! - Update the Effect v4 beta dependencies to 4.0.0-beta.43 for the language service and v4 harness packages.