repl: fix tla function hoisting

Author: DonJayamanne

lib/internal/repl/await.js

@@ -33,8 +33,8 @@ const visitorsWithoutAncestors = {
     if (isTopLevelDeclaration(state)) {
       state.prepend(node, `${node.id.name}=`);
       ArrayPrototypePush(
-        state.hoistedDeclarationStatements,
-        `let ${node.id.name}; `
+        state.hoistedDeclaration,
+        `this.${node.id.name} = ${node.id.name}; `
       );
     }
 
@@ -49,8 +49,8 @@ const visitorsWithoutAncestors = {
   FunctionDeclaration(node, state, c) {
     state.prepend(node, `${node.id.name}=`);
     ArrayPrototypePush(
-      state.hoistedDeclarationStatements,
-      `var ${node.id.name}; `
+      state.hoistedDeclaration,
+      `this.${node.id.name} = ${node.id.name}; `
     );
   },
   FunctionExpression: noop,
@@ -195,6 +195,7 @@ function processTopLevelAwait(src) {
   const state = {
     body,
     ancestors: [],
+    hoistedDeclaration: [],
     hoistedDeclarationStatements: [],
     replace(from, to, str) {
       for (let i = from; i < to; i++) {
@@ -239,7 +240,10 @@ function processTopLevelAwait(src) {
     state.prepend(last, 'return (');
     state.append(last.expression, ')');
   }
-
+  const hoisted = ArrayPrototypeJoin(state.hoistedDeclaration, '');
+  if (hoisted.length > 0) {
+    wrappedArray[wrapPrefix.length - 1] = hoisted;
+  }
   return (
     ArrayPrototypeJoin(state.hoistedDeclarationStatements, '') +
     ArrayPrototypeJoin(wrappedArray, '')

test/parallel/test-repl-preprocess-top-level-await.js

@@ -54,11 +54,11 @@ const testCases = [
     '(async () => { return (console.log(`${(await { a: 1 }).a}`)) })()' ],
   /* eslint-enable no-template-curly-in-string */
   [ 'await 0; function foo() {}',
-    'var foo; (async () => { await 0; foo=function foo() {} })()' ],
+    'var foo; (async () => {this.foo = foo; await 0; function foo() {} })()' ],
   [ 'await 0; class Foo {}',
-    'let Foo; (async () => { await 0; Foo=class Foo {} })()' ],
+    'let Foo; (async () => {this.Foo = Foo; await 0; class Foo {} })()' ],
   [ 'if (await true) { function foo() {} }',
-    'var foo; (async () => { if (await true) { foo=function foo() {} } })()' ],
+    'var foo; (async () => {this.foo = foo; if (await true) { function foo() {} } })()' ],
   [ 'if (await true) { class Foo{} }',
     '(async () => { if (await true) { class Foo{} } })()' ],
   [ 'if (await true) { var a = 1; }',
@@ -116,6 +116,8 @@ const testCases = [
     '(async () => { for (let i in {x:1}) { await 1 } })()'],
   [ 'for (const i in {x:1}) { await 1 }',
     '(async () => { for (const i in {x:1}) { await 1 } })()'],
+  [ 'var x = await foo(); async function foo() { return Promise.resolve(1);}',
+    'var x; var foo; (async () => {this.foo = foo; void (x = await foo()); async function foo() { return Promise.resolve(1);} })()'],
 ];
 
 for (const [input, expected] of testCases) {