feature: @putout/plugin-minify: merge-variables: include let

Author: coderaiser

packages/plugin-minify/lib/merge-variables/fixture/await-fix.js

@@ -1,6 +1,5 @@
 async function onChange(a) {
-    var b = a.target, e = document.getElementById(target);
-    let c = b.value;
+    var b = a.target, c = b.value, e = document.getElementById(target);
 
     type == 'email' && (c = c.split('@')[1]);
 

packages/plugin-minify/lib/merge-variables/fixture/let-couple-fix.js

@@ -0,0 +1 @@
+let a = 'hello', b = '("' + a + '")';

packages/plugin-minify/lib/merge-variables/fixture/let-couple.js

@@ -0,0 +1 @@
+ let a='hello';let b='("'+a+'")';

packages/plugin-minify/lib/merge-variables/index.js

@@ -18,9 +18,6 @@ export const traverse = ({push, uplist}) => ({
         if (path.parentPath.node.declarations.length !== 1)
             return;
 
-        if (path.parentPath.node.kind === 'let')
-            return;
-        
         const initPath = path.get('init');
 
         if (initPath.isAwaitExpression())

packages/plugin-minify/lib/merge-variables/index.spec.js

@@ -78,6 +78,11 @@ test('plugin-minify: merge-variables: no report: for-of', (t) => {
     t.end();
 });
 
+test('plugin-minify: merge-variables: transform: let-couple', (t) => {
+    t.transform('let-couple');
+    t.end();
+});
+
 test('plugin-minify: merge-variables: transform: remove-unreferenced-variables', (t) => {
     t.transform('remove-unreferenced-variables', {
         'remove-unreferenced-variables': removeUnreferencedVariables,

packages/plugin-minify/test/fixture/extract-body-fix.js

@@ -1,8 +1,7 @@
 if (x)
     return;
 
-let x = () => m;
-let y = () => m();
+let x = () => m, y = () => m();
 
 function z() {
     return hello;

packages/plugin-minify/test/fixture/mangle-names-fix.js

@@ -1,9 +1,5 @@
 function A() {
-    let a = 5;
-    let b = 7;
-    let c = 8;
-    
-    let d = 'hello';
+    let a = 5, b = 7, c = 8, d = 'hello';
 
     function e() {
         return A;

packages/plugin-minify/test/fixture/merge-destructuring-properties-fix.js

@@ -1,6 +1,5 @@
-const {defineProperty: a, keys: b} = Object;
-let c = null;
-let d = 1073741823;
+const {defineProperty: a} = Object;
+let c = null, d = 1073741823, {keys: b} = Object;
 
 function A(...e) {
     if (n)

packages/plugin-minify/test/fixture/merge-variables-fix.js

@@ -1,6 +1,4 @@
 var a, b;
 
-if (a > 3) {
-    const b = 5;
-    let d = 3;
-}
+if (a > 3)
+    const b = 5, d = 3;

packages/plugin-minify/test/fixture/mutation-fix.js

@@ -1,13 +1,9 @@
 async function a(A) {
-    let b = A.target;
-    
-    let c = b.value;
+    let b = A.target, c = b.value, e = document.getElementById(b.dataset.resultElement);
 
     type == 'email' && (c = c.split('@')[1]);
 
     let d = await checkDomain(c);
 
-    let e = document.getElementById(b.dataset.resultElement);
-    
     e.innerHTML = `Result: ${d.data}`;
 }