feat: use yieldable errors

src/create-project.ts

@@ -1,4 +1,4 @@
-import { Effect } from "effect";
+import { Data, Effect } from "effect";
 import {
 	ModuleKind,
 	ModuleResolutionKind,
@@ -12,10 +12,9 @@ export type CreateProjectOptions = {
 };
 
 /** @internal */
-export class ProjectError {
-	readonly _tag = "ProjectError";
-	constructor(readonly cause?: unknown) {}
-}
+export class ProjectError extends Data.TaggedError("ProjectError")<{
+	readonly cause?: unknown;
+}> {}
 
 export const createProject = ({ indexFilePath, cwd }: CreateProjectOptions) =>
 	Effect.try({
@@ -40,5 +39,5 @@ export const createProject = ({ indexFilePath, cwd }: CreateProjectOptions) =>
 			project.resolveSourceFileDependencies();
 			return { project, indexFile };
 		},
-		catch: (e) => new ProjectError(e),
+		catch: (e) => new ProjectError({ cause: e }),
 	});

src/install-package.ts

@@ -1,4 +1,4 @@
-import { Effect } from "effect";
+import { Data, Effect } from "effect";
 import { execa } from "execa";
 
 /** @internal */
@@ -9,10 +9,9 @@ export type InstallPackageOptions = {
 };
 
 /** @internal */
-export class InstallPackageError {
-	readonly _tag = "InstallPackageError";
-	constructor(readonly cause?: unknown) {}
-}
+export class InstallPackageError extends Data.TaggedError(
+	"InstallPackageError",
+)<{ cause?: unknown }> {}
 
 /** @internal */
 export const installPackage = ({
@@ -28,7 +27,7 @@ export const installPackage = ({
 const bunAdd = ({ pkg, cwd, bunPath }: Required<InstallPackageOptions>) =>
 	Effect.tryPromise({
 		try: () => execa(bunPath, ["add", pkg, "--verbose"], { cwd }),
-		catch: (e) => new InstallPackageError(e),
+		catch: (e) => new InstallPackageError({ cause: e }),
 	});
 
 const installedPackages = (stdout: string) => {

src/package-declarations.ts

@@ -1,4 +1,4 @@
-import { Effect } from "effect";
+import { Data, Effect } from "effect";
 import type { Project, SourceFile } from "ts-morph";
 import { extractDeclarations } from "./extract-declarations";
 
@@ -10,10 +10,9 @@ export type PackageDeclarationsOptions = {
 };
 
 /** @internal */
-export class PackageDeclarationsError {
-	readonly _tag = "PackageDeclarationsError";
-	constructor(readonly cause?: unknown) {}
-}
+export class PackageDeclarationsError extends Data.TaggedError(
+	"PackageDeclarationsError",
+)<{ cause?: unknown }> {}
 
 export const packageDeclarations = ({
 	pkgName,
@@ -30,5 +29,5 @@ export const packageDeclarations = ({
 				project,
 				pkgName,
 			}),
-		catch: (e) => new PackageDeclarationsError(e),
+		catch: (e) => new PackageDeclarationsError({ cause: e }),
 	});

src/package-json.ts

@@ -1,15 +1,14 @@
-import { Effect } from "effect";
+import { Data, Effect } from "effect";
 import { readPackage } from "read-pkg";
 
 /** @internal */
-export class PackageJsonError {
-	readonly _tag = "PackageJsonError";
-	constructor(readonly cause?: unknown) {}
-}
+export class PackageJsonError extends Data.TaggedError("PackageJsonError")<{
+	cause?: unknown;
+}> {}
 
 /** @internal */
 export const packageJson = (pkgDir: string) =>
 	Effect.tryPromise({
 		try: () => readPackage({ cwd: pkgDir }),
-		catch: (e) => new PackageJsonError(e),
+		catch: (e) => new PackageJsonError({ cause: e }),
 	});

src/package-name.ts

@@ -1,18 +1,20 @@
-import { Effect } from "effect";
+import { Data, Effect } from "effect";
 import validate from "validate-npm-package-name";
 
 /** @internal */
-export class PackageNameError {
-	readonly _tag = "PackageNameError";
-}
+export class PackageNameError extends Data.TaggedError("PackageNameError")<{
+	warnings?: string[];
+	errors?: string[];
+}> {}
 
 /** @internal */
 export const packageName = (pkg: string) =>
-	Effect.suspend(() => {
+	Effect.gen(function* (_) {
 		const versionMarker = pkg.lastIndexOf("@");
-		const name = pkg.slice(0, versionMarker > 0 ? versionMarker : undefined);
-		if (!validate(name).validForNewPackages) {
-			return Effect.fail(new PackageNameError());
+		const pkgName = pkg.slice(0, versionMarker > 0 ? versionMarker : undefined);
+		const { validForNewPackages, warnings, errors } = validate(pkgName);
+		if (!validForNewPackages) {
+			return yield* _(new PackageNameError({ warnings, errors }));
 		}
-		return Effect.succeed(name);
+		return pkgName;
 	});

src/package-types.ts

@@ -1,11 +1,9 @@
-import { Effect } from "effect";
+import { Data, Effect } from "effect";
 import type { NormalizedPackageJson } from "read-pkg";
 import { exports } from "resolve.exports";
 
 /** @internal */
-export class PackageTypesError {
-	readonly _tag = "PackageTypesError";
-}
+export class PackageTypesError extends Data.TaggedError("PackageTypesError") {}
 
 /**
 `packageTypes` resolves the types entrypoint file (e.g., `index.d.ts`).
@@ -32,7 +30,7 @@ export const packageTypes = (
 		if (isRootSubpath && pkgJson.typings && isTypesFile(pkgJson.typings)) {
 			return pkgJson.typings;
 		}
-		return yield* _(Effect.fail(new PackageTypesError()));
+		return yield* _(new PackageTypesError());
 	});
 
 const resolveExports = (

src/work-dir.ts

@@ -1,4 +1,4 @@
-import { Effect } from "effect";
+import { Data, Effect } from "effect";
 import { rm } from "node:fs/promises";
 import { temporaryDirectory } from "tempy";
 
@@ -9,10 +9,9 @@ export type WorkDir = {
 };
 
 /** @internal */
-export class WorkDirError {
-	readonly _tag = "WorkDirError";
-	constructor(readonly cause?: unknown) {}
-}
+export class WorkDirError extends Data.TaggedError("WorkDirError")<{
+	cause?: unknown;
+}> {}
 
 const acquire = Effect.try({
 	try: () => {
@@ -26,7 +25,7 @@ const acquire = Effect.try({
 			},
 		};
 	},
-	catch: (e) => new WorkDirError(e),
+	catch: (e) => new WorkDirError({ cause: e }),
 });
 
 const release = (workDir: WorkDir) => Effect.promise(() => workDir.close());