Trailing Comma Compiler Issues

[ewwwgiddings]

Suggestion: Remove trailing commas in arguments of functions / arguments lists.

Reason: This feature is only available in ES8/ES2017 and when compiling for a lower version it throws various hard to see errors. The default target in the tsconfig for Angular 8 is es6 so these errors come up when using this library with TypeScript in Angular (and I'm sure others).

ToDo: Remove trailing commas here:

Base.js line 39
canvasRenderer.js many - drop it into https://jshint.com to find
fontMetrics.js > line 114
svgRenderer many - use jsHint or something similar to find
Util.js line 143
TextRenderer line 102, 125, 144-155
LiterallyCanvas.js many - use JSHint
RenderSnapshotToImage.js line 53, 73
RenderSnapshotToSVG.js line 36, 43
Shapes.js many - use JSHint
Pan.js line 31
Polygon.js JSHint
SelectShape.js line 112, 123
Text.js JSHint

Opinion: There's nothing really gained by having them (?) but a lot lost by including them as far as compatibility when used with default settings in popular frameworks.