Use npm Registry Filter Header (#249)

Closes #245

lib/api/npm.js

@@ -19,6 +19,9 @@ async function getDependency(name) {
   const authInfo = registryAuthToken(regUrl);
   const headers = {};
 
+  // Reduce metadata https://github.com/npm/registry/blob/master/docs/responses/package-metadata.md
+  headers.accept = 'application/vnd.npm.install-v1+json';
+
   if (authInfo) {
     headers.authorization = `${authInfo.type} ${authInfo.token}`;
   }

test/api/__snapshots__/npm.spec.js.snap

+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`api/npm should fetch package info from npm 1`] = `
+Array [
+  "https://npm.mycustomregistry.com/foobar",
+  Object {
+    "headers": Object {
+      "accept": "application/vnd.npm.install-v1+json",
+    },
+    "json": true,
+  },
+]
+`;
+
+exports[`api/npm should send an authorization header if provided 1`] = `
+Array [
+  "https://npm.mycustomregistry.com/foobar",
+  Object {
+    "headers": Object {
+      "accept": "application/vnd.npm.install-v1+json",
+      "authorization": "Basic 1234",
+    },
+    "json": true,
+  },
+]
+`;

test/api/npm.spec.js

@@ -17,10 +17,7 @@ describe('api/npm', () => {
     const res = await npm.getDependency('foobar');
     expect(res).toMatchObject({ some: 'data' });
     const call = got.mock.calls[0];
-    expect(call).toMatchObject([
-      'https://npm.mycustomregistry.com/foobar',
-      { json: true, headers: {} },
-    ]);
+    expect(call).toMatchSnapshot();
   });
   it('should send an authorization header if provided', async () => {
     registryUrl.mockImplementation(() => 'https://npm.mycustomregistry.com/');
@@ -32,14 +29,6 @@ describe('api/npm', () => {
     const res = await npm.getDependency('foobar');
     expect(res).toMatchObject({ some: 'data' });
     const call = got.mock.calls[0];
-    expect(call).toMatchObject([
-      'https://npm.mycustomregistry.com/foobar',
-      {
-        json: true,
-        headers: {
-          authorization: 'Basic 1234',
-        },
-      },
-    ]);
+    expect(call).toMatchSnapshot();
   });
 });