package upgrades & linter fixes

addons/addon-webgl/src/WebglRenderer.ts

@@ -407,8 +407,8 @@ export class WebglRenderer extends Disposable implements IRenderer {
     let line: IBufferLine;
     let joinedRanges: [number, number][];
     let isJoined: boolean;
-    let skipJoinedCheckUntilX: number = 0;
-    let isValidJoinRange: boolean = true;
+    let skipJoinedCheckUntilX: number;
+    let isValidJoinRange: boolean;
     let lastCharX: number;
     let range: [number, number];
     let isCursorRow: boolean;

addons/addon-webgl/src/tsconfig.json

@@ -25,7 +25,6 @@
       ]
     },
     "strict": true,
-    "downlevelIteration": true,
     "experimentalDecorators": true,
     "types": [
       "../../../node_modules/@types/mocha"