Disallowing access to the backend-core barrel file as it can cause problems, it should only ever be imported externally via @budibase/backend-core.

.eslintrc.json

@@ -43,6 +43,7 @@
       },
       "rules": {
         "no-unused-vars": "off",
+        "local-rules/no-barrel-imports": "error",
         "local-rules/no-budibase-imports": "error",
         "local-rules/no-console-error": "error",
         "@typescript-eslint/no-unused-vars": [

eslint-local-rules/index.js

@@ -1,3 +1,14 @@
+const path = require("path")
+
+const makeBarrelPath = finalPath => {
+  return path.resolve(__dirname, "..", finalPath)
+}
+const backendCoreBarrelPaths = [
+  makeBarrelPath(path.join("packages", "backend-core", "src", "index.ts")),
+  makeBarrelPath(path.join("packages", "backend-core", "src")),
+  makeBarrelPath(path.join("packages", "backend-core")),
+]
+
 module.exports = {
   "no-console-error": {
     create: function (context) {
@@ -13,11 +24,12 @@ module.exports = {
           ) {
             context.report({
               node,
-              message: 'Using console.error(err) on its own is not allowed. Either provide context to the error (console.error(msg, err)) or throw it.',
+              message:
+                "Using console.error(err) on its own is not allowed. Either provide context to the error (console.error(msg, err)) or throw it.",
             })
           }
         },
-      };
+      }
     },
   },
   "no-budibase-imports": {
@@ -106,4 +118,42 @@ module.exports = {
       }
     },
   },
+  "no-barrel-imports": {
+    meta: {
+      type: "problem",
+      docs: {
+        description:
+          "Disallow imports from the top-level backend-core barrel file",
+        category: "Best Practices",
+        recommended: false,
+      },
+      schema: [], // no options
+      messages: {
+        noBarrelImport:
+          "Avoid importing from the top-level barrel file 'backend-core/src/index.ts'. Import directly from the specific module instead.",
+      },
+    },
+    create(context) {
+      return {
+        ImportDeclaration(node) {
+          const importPath = node.source.value
+          const importFullPath = path.resolve(
+            context.getFilename(),
+            "..",
+            importPath
+          )
+
+          if (backendCoreBarrelPaths.includes(importFullPath)) {
+            context.report({
+              node,
+              messageId: "noBarrelImport",
+              data: {
+                importFullPath,
+              },
+            })
+          }
+        },
+      }
+    },
+  },
 }

packages/backend-core/src/context/tests/index.spec.ts

@@ -2,7 +2,7 @@ import { testEnv } from "../../../tests/extra"
 import * as context from "../"
 import { DEFAULT_TENANT_ID } from "../../constants"
 import { structures } from "../../../tests"
-import { db } from "../.."
+import * as db from "../../db"
 import Context from "../Context"
 import { ContextMap } from "../types"
 import { IdentityType } from "@budibase/types"

packages/backend-core/src/features/tests/features.spec.ts

@@ -1,6 +1,6 @@
 import { IdentityContext, IdentityType, UserCtx } from "@budibase/types"
 import { Flag, FlagSet, FlagValues, init, shutdown } from "../"
-import { context } from "../.."
+import * as context from "../../context"
 import environment, { withEnv } from "../../environment"
 import nodeFetch from "node-fetch"
 import nock from "nock"

packages/backend-core/src/redis/tests/redis.spec.ts

@@ -1,7 +1,7 @@
 import { GenericContainer, StartedTestContainer } from "testcontainers"
 import { generator, structures } from "../../../tests"
 import RedisWrapper, { closeAll } from "../redis"
-import { env } from "../.."
+import env from "../../environment"
 import { randomUUID } from "crypto"
 
 jest.setTimeout(30000)