feat: implement gql query linting in codemirror

helpers/editor/linting/gqlQuery.ts

@@ -0,0 +1,58 @@
+import { Ref } from "@nuxtjs/composition-api"
+import {
+  GraphQLError,
+  GraphQLSchema,
+  parse as gqlParse,
+  validate as gqlValidate,
+} from "graphql"
+import { LinterDefinition, LinterResult } from "./linter"
+
+/**
+ * Creates a Linter function that can lint a GQL query against a given
+ * schema
+ */
+export const createGQLQueryLinter: (
+  schema: Ref<GraphQLSchema | null>
+) => LinterDefinition = (schema: Ref<GraphQLSchema | null>) => (text) => {
+  if (text === "") return Promise.resolve([])
+  if (!schema.value) return Promise.resolve([])
+
+  try {
+    const doc = gqlParse(text)
+
+    const results = gqlValidate(schema.value, doc).map(
+      ({ locations, message }) =>
+        <LinterResult>{
+          from: {
+            line: locations![0].line - 1,
+            ch: locations![0].column - 1,
+          },
+          to: {
+            line: locations![0].line - 1,
+            ch: locations![0].column,
+          },
+          message,
+          severity: "error",
+        }
+    )
+
+    return Promise.resolve(results)
+  } catch (e) {
+    const err = e as GraphQLError
+
+    return Promise.resolve([
+      <LinterResult>{
+        from: {
+          line: err.locations![0].line - 1,
+          ch: err.locations![0].column - 1,
+        },
+        to: {
+          line: err.locations![0].line - 1,
+          ch: err.locations![0].column,
+        },
+        message: err.message,
+        severity: "error",
+      },
+    ])
+  }
+}