Fix reduce of empty array with no initial value

[yoonieaj]

Running some examples in docs\docs\99-api\examples, (in particular, style_demo.js) results in TypeError: Reduce of empty array with no initial value.

[leowrites]

After some investigation, we found the issue to be the usage of 'x-large' font size. In getTextLength, the code assumes the font size to be in pixels, and parsing 'x-large' led to undefined behaviors.

Regardless, we should still add checks to ensure we never try to reduce with an empty array

[leowrites]

Updating on this, another issue that appeared: we pass configuration.width to drawAutomate. However, the width may be undefined. For some reason TS did not raise an error for this, but we should ensure there is a width set, which should fix the reduce empty array problem.

We should also add strict null checks to the tsconfig so bugs like this doesn't happen again in the future.