feat: initial graphql language definition

packages/codemirror-lang-graphql/test/test.js

@@ -0,0 +1,17 @@
+import {GQLLanguage} from "../dist/index.js"
+import {fileTests} from "lezer-generator/dist/test"
+
+import * as fs from "fs"
+import * as path from "path"
+import { fileURLToPath } from 'url';
+let caseDir = path.dirname(fileURLToPath(import.meta.url))
+
+for (let file of fs.readdirSync(caseDir)) {
+  if (!/\.txt$/.test(file)) continue
+
+  let name = /^[^\.]*/.exec(file)[0]
+  describe(name, () => {
+    for (let {name, run} of fileTests(fs.readFileSync(path.join(caseDir, file), "utf8"), file))
+      it(name, () => run(GQLLanguage.parser))
+  })
+}