From 10354f69e45e157755d75c7d88af34810fc7eb45 Mon Sep 17 00:00:00 2001
From: Tomasz Pluskiewicz <tpluscode@users.noreply.github.com>
Date: Wed, 3 Apr 2024 16:22:25 +0200
Subject: [PATCH] feat: allow no fs factory

---
 .changeset/ten-apricots-buy.md | 5 +++++
 README.md                      | 2 +-
 lib/env.ts                     | 2 +-
 lib/fetchImport.ts             | 4 ++++
 4 files changed, 11 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/ten-apricots-buy.md

diff --git a/.changeset/ten-apricots-buy.md b/.changeset/ten-apricots-buy.md
new file mode 100644
index 0000000..eef3828
--- /dev/null
+++ b/.changeset/ten-apricots-buy.md
@@ -0,0 +1,5 @@
+---
+"rdf-transform-graph-imports": patch
+---
+
+Make the `FsUtilsFactory` optional. An exception wil be thrown when an enviornment does not provide that factory and a filesystem import is loaded
diff --git a/README.md b/README.md
index 9a982a9..75432e3 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ This package provides a stream transform which replaces import statements with c
 
 ## Installation
 
-Install the package itself and a RDF/JS environment which provides the factories [`NamespaceFactory`](https://github.com/rdfjs-base/namespace), [`FsUtilsFactory`](https://github.com/zazuko/rdf-utils-fs), and [`FetchFactory`](https://github.com/rdfjs-base/fetch-lite). If unsure, try [`@zazuko/env-node`](https://npm.im/@zazuko/env-node).
+Install the package itself and an RDF/JS environment which provides the factories [`NamespaceFactory`](https://github.com/rdfjs-base/namespace),  [`FetchFactory`](https://github.com/rdfjs-base/fetch-lite), and, optionally, [`FsUtilsFactory`](https://github.com/zazuko/rdf-utils-fs). If unsure, try [`@zazuko/env-node`](https://npm.im/@zazuko/env-node).
 
 ```bash
 npm install rdf-transform-graph-imports @zazuko/env-node
diff --git a/lib/env.ts b/lib/env.ts
index b93e29c..d6bd4f5 100644
--- a/lib/env.ts
+++ b/lib/env.ts
@@ -4,5 +4,5 @@ import type FsUtilsFactory from '@zazuko/rdf-utils-fs/Factory.js'
 import type { FetchFactory } from '@rdfjs/fetch-lite/Factory.js'
 import type ClownfaceFactory from 'clownface/Factory.js'
 
-type Environment = RdfjsEnvironment<NamespaceFactory | FsUtilsFactory | FetchFactory | ClownfaceFactory>
+type Environment = RdfjsEnvironment<NamespaceFactory | FsUtilsFactory | FetchFactory | ClownfaceFactory> | RdfjsEnvironment<NamespaceFactory | FetchFactory | ClownfaceFactory>
 export default Environment
diff --git a/lib/fetchImport.ts b/lib/fetchImport.ts
index 0684086..e977573 100644
--- a/lib/fetchImport.ts
+++ b/lib/fetchImport.ts
@@ -3,6 +3,10 @@ import Environment from './env.js'
 
 export default async function (env: Environment, importTarget: string | URL) {
   if (typeof importTarget === 'string') {
+    if (!('fromFile' in env)) {
+      throw new Error('Importing from file is not supported')
+    }
+
     return env.fromFile(importTarget, { implicitBaseIRI: true })
   }