package upgrades & linter fixes

src/common/TaskQueue.ts

@@ -74,10 +74,10 @@ abstract class TaskQueue implements ITaskQueue {
 
   private _process(deadline: ITaskDeadline): void {
     this._idleCallback = undefined;
-    let taskDuration = 0;
+    let taskDuration: number;
     let longestTask = 0;
     let lastDeadlineRemaining = deadline.timeRemaining();
-    let deadlineRemaining = 0;
+    let deadlineRemaining: number;
     while (this._i < this._tasks.length) {
       taskDuration = performance.now();
       if (!this._tasks[this._i]()) {

src/common/data/Charsets.ts

@@ -98,8 +98,7 @@ CHARSETS['4'] = {
  * ESC (C or ESC (5
  * Reference: http://vt100.net/docs/vt220-rm/table2-7.html
  */
-CHARSETS['C'] =
-CHARSETS['5'] = {
+CHARSETS['C'] = CHARSETS['5'] = {
   '[': 'Ä',
   '\\': 'Ö',
   ']': 'Å',
@@ -185,8 +184,7 @@ CHARSETS['Y'] = {
  * ESC (E or ESC (6
  * Reference: http://vt100.net/docs/vt220-rm/table2-12.html
  */
-CHARSETS['E'] =
-CHARSETS['6'] = {
+CHARSETS['E'] = CHARSETS['6'] = {
   '@': 'Ä',
   '[': 'Æ',
   '\\': 'Ø',
@@ -220,8 +218,7 @@ CHARSETS['Z'] = {
  * ESC (H or ESC (7
  * Reference: http://vt100.net/docs/vt220-rm/table2-14.html
  */
-CHARSETS['H'] =
-CHARSETS['7'] = {
+CHARSETS['H'] = CHARSETS['7'] = {
   '@': 'É',
   '[': 'Ä',
   '\\': 'Ö',

src/common/input/TextDecoder.ts

@@ -148,7 +148,7 @@ export class Utf8ToUtf32 {
     let byte2: number;
     let byte3: number;
     let byte4: number;
-    let codepoint = 0;
+    let codepoint;
     let startPos = 0;
 
     // handle leftover bytes

src/common/parser/EscapeSequenceParser.ts

@@ -572,8 +572,8 @@ export class EscapeSequenceParser extends Disposable implements IEscapeSequenceP
    * ```
    */
   public parse(data: Uint32Array, length: number, promiseResult?: boolean): void | Promise<boolean> {
-    let code = 0;
-    let transition = 0;
+    let code: number;
+    let transition: number;
     let start = 0;
     let handlerResult: void | boolean | Promise<boolean>;
 

src/common/services/DecorationService.ts

@@ -72,10 +72,10 @@ export class DecorationService extends Disposable implements IDecorationService
   }
 
   public *getDecorationsAtCell(x: number, line: number, layer?: 'bottom' | 'top'): IterableIterator<IInternalDecoration> {
-    let xmin = 0;
-    let xmax = 0;
-    let ymin = 0;
-    let ymax = 0;
+    let xmin;
+    let xmax;
+    let ymin;
+    let ymax;
     for (const d of this._decorations.values()) {
       ymin = d.marker.line;
       ymax = ymin + (d.options.height ?? 1);