fix(core): invalid URL error on relative imports

core/refs.ts

@@ -90,22 +90,28 @@ async function fromImportMap(
 ): Promise<DependencyRef<"import_map">[]> {
   const json = await readImportMapJson(path);
 
-  const refs: DependencyRef<"import_map">[] = Object.entries(json.imports ?? {})
-    .map((
-      [key, value],
-    ) => ({
+  const refs: DependencyRef<"import_map">[] = [];
+
+  Object.entries(json.imports ?? {}).forEach(([key, value]) => {
+    const dep = tryParse(value);
+    if (!dep) return;
+    refs.push({
       dependency: parse(value),
       source: { path, kind: "import_map", key },
-    }));
+    });
+  });
 
   Object.entries(json.scopes ?? {}).forEach(([scope, imports]) =>
-    refs.push(
-      ...Object.entries(imports).map(([key, value]) => ({
+    Object.entries(imports).map(([key, value]) => {
+      const dep = tryParse(value);
+      if (!dep) return;
+      refs.push({
         dependency: parse(value),
         source: { path, kind: "import_map", key, scope },
-      } as DependencyRef<"import_map">)),
-    )
+      });
+    })
   );
+
   return refs;
 }
 

core/refs_test.ts

@@ -53,6 +53,17 @@ describe("collect", () => {
     ]);
   });
 
+  it("should ignore relative imports in an ES module", async () => {
+    await Deno.writeTextFile(
+      "a.ts",
+      dedent`
+        import { assert } from "./assert.ts";
+      `,
+    );
+    const actual = await collect("a.ts");
+    assertEquals(actual, []);
+  });
+
   it("should collect dependencies from an import map", async () => {
     await Deno.writeTextFile(
       "a.json",
@@ -140,6 +151,21 @@ describe("collect", () => {
       },
     ]);
   });
+
+  it("should ignore relative imports in an import map", async () => {
+    await Deno.writeTextFile(
+      "a.json",
+      dedent`
+        {
+          "imports": {
+            "assert": "./assert.ts",
+          }
+        }
+      `,
+    );
+    const actual = await collect("a.json");
+    assertEquals(actual, []);
+  });
 });
 
 describe("rewrite", () => {