Disallow template literals when placeholders or tagged template featu…

…res are not used

Fixes: #838
Fixes: standard/eslint-config-standard#151

CHANGELOG.md

@@ -3,6 +3,18 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## UNRELEASED
+
+### New features
+
+### New rules
+
+*(Estimated % of affected standard users, based on test suite in parens)*
+
+- Disallow template literals when placeholders or tagged template features are not used. ([quotes](https://eslint.org/docs/rules/quotes)) [#838](https://github.com/standard/standard/issues/838) [eslint-config-standard/#151](https://github.com/standard/eslint-config-standard/pull/151) (1%)
+
+### Changed rules
+
 ## 13.1.0 - 2019-07-20
 
 - Update `eslint` from `~6.0.1` to `~6.1.0`

RULES.md

@@ -37,8 +37,12 @@ your code.
   eslint: [`quotes`](http://eslint.org/docs/rules/quotes)
 
   ```js
-  console.log('hello there')
-  $("<div class='box'>")
+  console.log('hello there')    // ✓ ok
+  console.log("hello there")    // ✗ avoid
+  console.log(`hello there`)    // ✗ avoid
+
+  $("<div class='box'>")        // ✓ ok
+  console.log(`hello ${name}`)  // ✓ ok
   ```
 
 * **No unused variables.**

eslintrc.json

@@ -1,3 +1,6 @@
 {
-  "extends": ["standard", "standard-jsx"]
+  "extends": ["standard", "standard-jsx"],
+  "rules": {
+    "quotes": ["error", "single", { "avoidEscape": true }]
+  }
 }