1 files changed, 35 insertions, 0 deletions
diff --git a/cli/resolver.rs b/cli/resolver.rs
new file mode 100644
index 000000000..d3427c58b
--- /dev/null
+++ b/cli/resolver.rs
@@ -0,0 +1,35 @@
+// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
+
+use deno_core::error::AnyError;
+use deno_core::ModuleSpecifier;
+use deno_graph::source::Resolver;
+use import_map::ImportMap;
+
+/// Wraps an import map to be used when building a deno_graph module graph.
+/// This is done to avoid having `import_map` be a direct dependency of
+/// `deno_graph`.
+#[derive(Debug)]
+pub(crate) struct ImportMapResolver<'a>(&'a ImportMap);
+
+impl<'a> ImportMapResolver<'a> {
+  pub fn new(import_map: &'a ImportMap) -> Self {
+    Self(import_map)
+  }
+
+  pub fn as_resolver(&'a self) -> &'a dyn Resolver {
+    self
+  }
+}
+
+impl Resolver for ImportMapResolver<'_> {
+  fn resolve(
+    &self,
+    specifier: &str,
+    referrer: &ModuleSpecifier,
+  ) -> Result<ModuleSpecifier, AnyError> {
+    self
+      .0
+      .resolve(specifier, referrer.as_str())
+      .map_err(|err| err.into())
+  }
+}