1 files changed, 87 insertions, 0 deletions
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-static-import.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-static-import.js
new file mode 100644
index 0000000000..100b5682de
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/use-static-import.js
@@ -0,0 +1,87 @@
+/**
+ * @fileoverview Require use of static imports where possible.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const helpers = require("../helpers");
+
+function isIdentifier(node, id) {
+  return node && node.type === "Identifier" && node.name === id;
+}
+
+module.exports = {
+  meta: {
+    docs: {
+      url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/rules/use-static-import.html",
+    },
+    fixable: "code",
+    messages: {
+      useStaticImport:
+        "Please use static import instead of ChromeUtils.importESModule",
+    },
+    schema: [],
+    type: "suggestion",
+  },
+
+  create(context) {
+    return {
+      VariableDeclarator(node) {
+        if (
+          node.init?.type != "CallExpression" ||
+          node.init?.callee?.type != "MemberExpression" ||
+          !context.getFilename().endsWith(".sys.mjs") ||
+          !helpers.isTopLevel(context.getAncestors())
+        ) {
+          return;
+        }
+
+        let callee = node.init.callee;
+
+        if (
+          isIdentifier(callee.object, "ChromeUtils") &&
+          isIdentifier(callee.property, "importESModule") &&
+          callee.parent.arguments.length == 1
+        ) {
+          let sourceCode = context.getSourceCode();
+          let importItemSource;
+          if (node.id.type != "ObjectPattern") {
+            importItemSource = sourceCode.getText(node.id);
+          } else {
+            importItemSource = "{ ";
+            let initial = true;
+            for (let property of node.id.properties) {
+              if (!initial) {
+                importItemSource += ", ";
+              }
+              initial = false;
+              if (property.key.name == property.value.name) {
+                importItemSource += property.key.name;
+              } else {
+                importItemSource += `${property.key.name} as ${property.value.name}`;
+              }
+            }
+            importItemSource += " }";
+          }
+
+          context.report({
+            node: node.parent,
+            messageId: "useStaticImport",
+            fix(fixer) {
+              return fixer.replaceText(
+                node.parent,
+                `import ${importItemSource} from ${sourceCode.getText(
+                  callee.parent.arguments[0]
+                )}`
+              );
+            },
+          });
+        }
+      },
+    };
+  },
+};