fix(generators): Fix minor inconsistencies in JS and Python

The migration of the JavaScript and Python generators
inadvertently introduced some inconsistencies in the code,
e.g.:

- Incorrect import ordering.
- Putting executable code before the initial comment line that
  most generator functions begin with, and/or deleting or
  replacing these comments.
  -  N.B. however that these inline comments should have been
     JSDocs; a task to convert them has been added to google#7600.

generators/javascript/lists.ts

@@ -29,8 +29,8 @@ export function lists_create_with(
   block: Block,
   generator: JavascriptGenerator,
 ): [string, Order] {
-  const createWithBlock = block as CreateWithBlock;
   // Create a list with any number of elements of any type.
+  const createWithBlock = block as CreateWithBlock;
   const elements = new Array(createWithBlock.itemCount_);
   for (let i = 0; i < createWithBlock.itemCount_; i++) {
     elements[i] = generator.valueToCode(block, 'ADD' + i, Order.NONE) || 'null';

generators/javascript/logic.ts

@@ -63,7 +63,7 @@ export function logic_compare(
   block: Block,
   generator: JavascriptGenerator,
 ): [string, Order] {
-  // Dictionary of OP comparison operators and their implementations.
+  // Comparison operator.
   const OPERATORS = {
     'EQ': '==',
     'NEQ': '!=',

generators/javascript/text.ts

@@ -11,8 +11,8 @@
 // Former goog.module ID: Blockly.JavaScript.texts
 
 import type {Block} from '../../core/block.js';
-import type {JoinMutatorBlock} from '../../blocks/text.js';
 import type {JavascriptGenerator} from './javascript_generator.js';
+import type {JoinMutatorBlock} from '../../blocks/text.js';
 import {Order} from './javascript_generator.js';
 
 /**
@@ -80,8 +80,8 @@ export function text_join(
   block: Block,
   generator: JavascriptGenerator,
 ): [string, Order] {
-  const joinBlock = block as JoinMutatorBlock;
   // Create a string made up of any number of elements of any type.
+  const joinBlock = block as JoinMutatorBlock;
   switch (joinBlock.itemCount_) {
     case 0:
       return ["''", Order.ATOMIC];

generators/python/lists.ts

@@ -29,8 +29,8 @@ export function lists_create_with(
   block: Block,
   generator: PythonGenerator,
 ): [string, Order] {
-  const createWithBlock = block as CreateWithBlock;
   // Create a list with any number of elements of any type.
+  const createWithBlock = block as CreateWithBlock;
   const elements = new Array(createWithBlock.itemCount_);
   for (let i = 0; i < createWithBlock.itemCount_; i++) {
     elements[i] = generator.valueToCode(block, 'ADD' + i, Order.NONE) || 'None';

generators/python/text.ts

@@ -61,9 +61,9 @@ export function text_join(
   block: Block,
   generator: PythonGenerator,
 ): [string, Order] {
-  const joinBlock = block as JoinMutatorBlock;
   // Create a string made up of any number of elements of any type.
   // Should we allow joining by '-' or ',' or any other characters?
+  const joinBlock = block as JoinMutatorBlock;
   switch (joinBlock.itemCount_) {
     case 0:
       return ["''", Order.ATOMIC];