This reads include from the relay config as well

src/generateConfig.ts

@@ -1,5 +1,4 @@
 import * as path from "path"
-
 import { ApolloConfigFormat } from "apollo-language-server/lib/config"
 import { ValidationRule } from "graphql"
 import { defaultValidationRules, RelayConfig, RelayCompilerMain } from "./dependencies"
@@ -53,6 +52,12 @@ export function generateConfig(compat: boolean = false) {
 
   const includesGlobPattern = (inputExtensions: string[]) => `**/*.{graphql,${inputExtensions.join(",")}}`
 
+  const configInclude = relayConfig ? relayConfig.include : undefined
+  const src = (relayConfig || DEFAULTS).src
+  const includes = configInclude
+    ? configInclude.map(i => path.join(src, i))
+    : [path.join((relayConfig || DEFAULTS).src, includesGlobPattern(extensions))]
+
   const config: ApolloConfigFormat = {
     client: {
       service: {
@@ -70,8 +75,8 @@ export function generateConfig(compat: boolean = false) {
           (rule: ValidationRule) => !ValidationRulesToExcludeForRelay.includes(rule.name)
         ),
       ],
-      includes: [directivesFile, path.join((relayConfig || DEFAULTS).src, includesGlobPattern(extensions))],
-      excludes: relayConfig ? relayConfig.exclude : [],
+      includes: [directivesFile, ...includes],
+      excludes: relayConfig && relayConfig.exclude ? relayConfig.exclude.map(ex => path.join(src, ex)) : [],
       tagName: "graphql",
     },
   }

tests/generateConfig-test.ts

@@ -3,17 +3,27 @@ import { Config } from "relay-compiler/lib/bin/RelayCompilerMain"
 import { LocalServiceConfig } from "apollo-language-server/lib/config"
 import { ValidationRule } from "graphql/validation"
 
+const defaultMockedConfig = {
+  config: {
+    schema: "path/to/schema.graphql",
+    src: "path/to/src-root",
+  } as Config,
+}
+
+let mockedConfig: { config: Config } = defaultMockedConfig
+
+function resetToDefaultConfig() {
+  mockedConfig = defaultMockedConfig
+}
+
 jest.mock("cosmiconfig", () => () => ({
-  searchSync: () => ({
-    config: {
-      schema: "path/to/schema.graphql",
-      src: "path/to/src-root",
-      exclude: ["path/to/exclude"],
-    } as Config,
-  }),
+  searchSync: () => mockedConfig,
 }))
 
 describe(generateConfig, () => {
+  afterEach(() => {
+    resetToDefaultConfig()
+  })
   xdescribe("when user does not use relay-config", () => {
     it("uses a default schema file", () => {
       jest.mock("relay-config", () => ({ loadConfig: () => null }))
@@ -39,8 +49,14 @@ describe(generateConfig, () => {
   })
 
   it("specifies the source files to exclude", () => {
+    mockedConfig = {
+      config: {
+        ...defaultMockedConfig.config,
+        exclude: ["path/to/exclude"],
+      },
+    }
     const config = generateConfig().config.client!
-    expect(config.excludes).toContain("path/to/exclude")
+    expect(config.excludes).toContain("path/to/src-root/path/to/exclude")
   })
 
   it("excludes validation rules that are incompatible with Relay", () => {
@@ -60,5 +76,17 @@ describe(generateConfig, () => {
     expect(config.includes).toContainEqual(expect.stringMatching(/relay-compiler-directives-v\d\.\d\.\d/))
   })
 
+  it("Respects includes", () => {
+    mockedConfig = {
+      config: {
+        ...defaultMockedConfig.config,
+        include: ["some/files/to/include/**"],
+      },
+    }
+
+    const config = generateConfig().config.client!
+    expect(config.includes).toContain("path/to/src-root/some/files/to/include/**")
+  })
+
   it.todo("specifies the source files to include with a different language plugin")
 })