Chore: create the `no-untranslated-literals` rule (#88271)

packages/grafana-eslint-rules/README.md

@@ -111,3 +111,53 @@ const getStyles = (theme: GrafanaTheme2) => ({
 ### `theme-token-usage`
 
 Used to find all instances of `theme` tokens being used in the codebase and emit the counts as metrics. Should **not** be used as an actual lint rule!
+
+### `no-untranslated-strings`
+
+Check if strings are marked for translation.
+
+```tsx
+// Bad ❌
+<InlineToast placement="top" referenceElement={buttonRef.current}>
+  Copied
+</InlineToast>
+
+// Good ✅
+<InlineToast placement="top" referenceElement={buttonRef.current}>
+  <Trans i18nKey="clipboard-button.inline-toast.success">Copied</Trans>
+</InlineToast>
+
+```
+
+#### Passing variables to translations
+
+```tsx
+// Bad ❌
+const SearchTitle = ({ term }) => (
+  <div>
+    Results for <em>{term}</em>
+  </div>
+);
+
+//Good ✅
+const SearchTitle = ({ term }) => (
+  <Trans i18nKey="search-page.results-title">
+    Results for <em>{{ term }}</em>
+  </Trans>
+);
+```
+
+#### How to translate props or attributes
+
+Right now, we only check if a string is wrapped up by the `Trans` tag. We currently do not apply this rule to props, attributes or similar, but we also ask for them to be translated with the `t()` function.
+
+```tsx
+// Bad ❌
+<input type="value" placeholder={'Username'} />;
+
+// Good ✅
+const placeholder = t('form.username-placeholder', 'Username');
+return <input type="value" placeholder={placeholder} />;
+```
+
+Check more info about how translations work in Grafana in [Internationalization.md](https://github.com/grafana/grafana/blob/main/contribute/internationalization.md)

packages/grafana-eslint-rules/index.cjs

@@ -1,6 +1,7 @@
 const noAriaLabelSelectors = require('./rules/no-aria-label-e2e-selectors.cjs');
 const noBorderRadiusLiteral = require('./rules/no-border-radius-literal.cjs');
 const noUnreducedMotion = require('./rules/no-unreduced-motion.cjs');
+const noUntranslatedStrings = require('./rules/no-utranslated-strings.cjs');
 const themeTokenUsage = require('./rules/theme-token-usage.cjs');
 
 module.exports = {
@@ -9,5 +10,6 @@ module.exports = {
     'no-aria-label-selectors': noAriaLabelSelectors,
     'no-border-radius-literal': noBorderRadiusLiteral,
     'theme-token-usage': themeTokenUsage,
+    'no-untranslated-strings': noUntranslatedStrings,
   },
 };

packages/grafana-eslint-rules/rules/no-utranslated-strings.cjs

@@ -0,0 +1,46 @@
+// @ts-check
+const { ESLintUtils, AST_NODE_TYPES } = require('@typescript-eslint/utils');
+
+const createRule = ESLintUtils.RuleCreator(
+  (name) => `https://github.com/grafana/grafana/blob/main/packages/grafana-eslint-rules/README.md#${name}`
+);
+
+const noUntranslatedStrings = createRule({
+  create(context) {
+    return {
+      JSXText(node) {
+        const ancestors = context.getAncestors();
+        const isEmpty =  !node.value.trim();
+        const hasTransAncestor = ancestors.some((ancestor) => {
+          return (
+            ancestor.type === AST_NODE_TYPES.JSXElement &&
+            ancestor.openingElement.type === AST_NODE_TYPES.JSXOpeningElement &&
+            ancestor.openingElement.name.type === AST_NODE_TYPES.JSXIdentifier &&
+            ancestor.openingElement.name.name === 'Trans'
+          );
+        });
+        if (!isEmpty && !hasTransAncestor) {
+          context.report({
+            node,
+            messageId: 'noUntranslatedStrings',
+          });
+        }
+      },
+    };
+  },
+  name: 'no-untranslated-strings',
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'Check untranslated strings',
+    },
+    messages: {
+      noUntranslatedStrings: 'No untranslated strings. Wrap text with <Trans />',
+    },
+    schema: [],
+  },
+  defaultOptions: [],
+});
+
+
+module.exports = noUntranslatedStrings;