JS: Fix merge of 3963 and 3961 (#3980)

* toString() was moved, not duplicated
* These had gotten lost
* This is now implemented
* Add missing version doctags

applications/system/js_app/packages/fz-sdk/global.d.ts

@@ -120,6 +120,7 @@ declare function checkSdkCompatibility(expectedMajor: number, expectedMinor: num
  *          recognized as a baseline feature. For more info, consult the module
  *          documentation.
  * @param features Array of named features to query
+ * @version Added in JS SDK 0.1
  */
 declare function doesSdkSupport(features: string[]): boolean;
 
@@ -131,6 +132,7 @@ declare function doesSdkSupport(features: string[]): boolean;
  *          features that are now recognized as baseline features. For more
  *          info, consult the module documentation.
  * @param features Array of named features to query
+ * @version Added in JS SDK 0.1
  */
 declare function checkSdkFeatures(features: string[]): void | never;
 
@@ -150,15 +152,48 @@ declare function delay(ms: number): void;
 declare function print(...args: any[]): void;
 
 /**
- * @brief Reads a JS value from a file
- * 
- * Reads a file at the specified path, interprets it as a JS value and returns
- * said value.
- * 
- * @param path The path to the file
+ * @brief Converts a string to a number
+ * @param text The string to convert to a number
+ * @param base Integer base (`2`...`16`), default: 10
  * @version Added in JS SDK 0.1
  */
-declare function load(path: string): any;
+declare function parseInt(text: string, base?: number): number;
+
+/**
+ * @brief Path to the directory containing the current script
+ * @version Added in JS SDK 0.1
+ */
+declare const __dirname: string;
+
+/**
+ * @brief Path to the current script file
+ * @version Added in JS SDK 0.1
+ */
+declare const __filename: string;
+
+/**
+ * @brief Runs a JS file and returns value from it
+ * 
+ * Reads a file at the specified path and runs it as JS, returning the last evaluated value.
+ * 
+ * The result is cached and this filepath will not re-evaluated on future
+ * load() calls for this session.
+ * 
+ * @param path The path to the file
+ * @param scope An object to use as global scope while running this file
+ * @version Added in JS SDK 0.1
+ */
+declare function load(path: string, scope?: object): any;
+
+/**
+ * @brief Return 1-byte string whose ASCII code is the integer `n`
+ * 
+ * If `n` is not numeric or outside of `0-255` range, `null` is returned
+ * 
+ * @param n The ASCII code to convert to string
+ * @version Added in JS SDK 0.1
+ */
+declare function chr(n: number): string | null;
 
 /**
  * @brief Loads a natively implemented module