chore: Reduce delta on ports to blockly-samples (#6886)

* Reduce usage of obsolete .keyCode property.
* Rename private properties/methods which violate eslint rules.
* Use arrays of bound events rather than individual properties.
* Improve typing info.
* Also fix O(n^2) recursive performance issue in theme's getComponentStyle function.
* And replace String(...) with '${...}' (smaller, faster).
* .toString() is considered harmful.

core/field_textinput.ts

@@ -25,37 +25,37 @@ import type {Sentinel} from './utils/sentinel.js';
  */
 export class FieldTextInput extends FieldInput<string> {
   /**
-   * @param opt_value The initial value of the field. Should cast to a string.
+   * @param value The initial value of the field. Should cast to a string.
    *     Defaults to an empty string if null or undefined. Also accepts
    *     Field.SKIP_SETUP if you wish to skip setup (only used by subclasses
    *     that want to handle configuration and setting the field value after
    *     their own constructors have run).
-   * @param opt_validator A function that is called to validate changes to the
+   * @param validator A function that is called to validate changes to the
    *     field's value. Takes in a string & returns a validated string, or null
    *     to abort the change.
-   * @param opt_config A map of options used to configure the field.
+   * @param config A map of options used to configure the field.
    *     See the [field creation documentation]{@link
    * https://developers.google.com/blockly/guides/create-custom-blocks/fields/built-in-fields/text-input#creation}
    * for a list of properties this parameter supports.
    */
   constructor(
-      opt_value?: string|Sentinel, opt_validator?: FieldTextInputValidator|null,
-      opt_config?: FieldTextInputConfig) {
-    super(opt_value, opt_validator, opt_config);
+      value?: string|Sentinel, validator?: FieldTextInputValidator|null,
+      config?: FieldTextInputConfig) {
+    super(value, validator, config);
   }
 
   /**
    * Ensure that the input value casts to a valid string.
    *
-   * @param opt_newValue The input value.
+   * @param newValue The input value.
    * @returns A valid string, or null if invalid.
    */
-  protected override doClassValidation_(opt_newValue?: AnyDuringMigration):
-      string|null {
-    if (opt_newValue === undefined) {
+  protected override doClassValidation_(newValue?: AnyDuringMigration): string
+      |null {
+    if (newValue === undefined) {
       return null;
     }
-    return String(opt_newValue);
+    return `${newValue}`;
   }
 
   /**