[Statsig] Typecheck gates (#3467)

* Typecheck gates

* Lint against untyped useGate()

* Alphabetic

2 files changed, 32 insertions, 0 deletions

diff --git a/eslint/index.js b/eslint/index.js
index daf5bd81d..bb31a942d 100644
--- a/eslint/index.js
+++ b/eslint/index.js
@@ -3,5 +3,6 @@
 module.exports = {
   rules: {
     'avoid-unwrapped-text': require('./avoid-unwrapped-text'),
+    'use-typed-gates': require('./use-typed-gates'),
   },
 }
diff --git a/eslint/use-typed-gates.js b/eslint/use-typed-gates.js
new file mode 100644
index 000000000..3625a7da3
--- /dev/null
+++ b/eslint/use-typed-gates.js
@@ -0,0 +1,31 @@
+'use strict'
+
+exports.create = function create(context) {
+  return {
+    ImportSpecifier(node) {
+      if (
+        !node.local ||
+        node.local.type !== 'Identifier' ||
+        node.local.name !== 'useGate'
+      ) {
+        return
+      }
+      if (
+        node.parent.type !== 'ImportDeclaration' ||
+        !node.parent.source ||
+        node.parent.source.type !== 'Literal'
+      ) {
+        return
+      }
+      const source = node.parent.source.value
+      if (source.startsWith('.') || source.startsWith('#')) {
+        return
+      }
+      context.report({
+        node,
+        message:
+          "Use useGate() from '#/lib/statsig/statsig' instead of the one on npm.",
+      })
+    },
+  }
+}