Fix printing unary statement with -(--i) (#4835)

Author: CompuIves

packages/app/src/sandbox/eval/transpilers/babel/convert-esmodule/__snapshots__/index.test.ts.snap

@@ -1,11 +1,5 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`convert-esmodule can convert + + 1`] = `
-"\\"use strict\\";
-c = (10, + +15);
-"
-`;
-
 exports[`convert-esmodule can convert class default exports 1`] = `
 "\\"use strict\\";
 Object.defineProperty(exports, \\"__esModule\\", {
@@ -298,7 +292,7 @@ exports[`convert-esmodule doesn't set var definitions 1`] = `
 Object.defineProperty(exports, \\"__esModule\\", {
   value: true
 });
-var global = typeof window !== \\"undefined\\" ? window : {};
+var global = typeof  window !== \\"undefined\\" ? window : {};
 exports.global = global;
 "
 `;
@@ -635,6 +629,12 @@ var WS_CHARS = \\"u2000- 

  　\\";
 "
 `;
 
+exports[`convert-esmodule printer issues can convert + + 1`] = `
+"\\"use strict\\";
+c = (10, + + 15);
+"
+`;
+
 exports[`convert-esmodule renames exports that are already defined, even in block scope 1`] = `
 "\\"use strict\\";
 var __$csb_exports = \\"testtest\\";

packages/app/src/sandbox/eval/transpilers/babel/convert-esmodule/generator.ts

@@ -69,10 +69,7 @@ export const customGenerator = {
   ) {
     if (node.prefix) {
       state.write(node.operator);
-      if (
-        node.operator.length > 1 ||
-        node.argument.type === 'UnaryExpression'
-      ) {
+      if (node.operator.length > 1) {
         state.write(' ');
       }
       if (
@@ -83,6 +80,7 @@ export const customGenerator = {
         this[node.argument.type](node.argument, state);
         state.write(')');
       } else {
+        state.write(' ');
         this[node.argument.type](node.argument, state);
       }
     } else {

packages/app/src/sandbox/eval/transpilers/babel/convert-esmodule/index.test.ts

@@ -424,11 +424,18 @@ describe('convert-esmodule', () => {
     expect(convertEsModule(code)).toMatchSnapshot();
   });
 
-  it('can convert + +', () => {
-    const code = `
-    c = (10.0, + +(15))
-    `;
-
-    expect(convertEsModule(code)).toMatchSnapshot();
+  describe('printer issues', () => {
+    it('can convert + +', () => {
+      const code = `
+      c = (10.0, + +(15))
+      `;
+
+      expect(convertEsModule(code)).toMatchSnapshot();
+    });
+
+    it('can convert -(--i)', () => {
+      const code = `a = -(--i)`;
+      expect(convertEsModule(code)).toBe('"use strict";\na = - --i;\n');
+    });
   });
 });