Fix disruptive unexceptional exceptions from being thrown in shouldHi…

…ghlight in pretty-dom. (These were often disruptive to developers who need to catch some other first-chance exception in the act as they may have to wade through these unexceptional occurrences on the way to get to their target first-chance exception.)

src/pretty-dom.js

@@ -5,25 +5,20 @@ import {getDocument} from './helpers'
 import {getConfig} from './config'
 
 const shouldHighlight = () => {
-  let colors
+  // Try to safely parse env COLORS: We will default behavior if any step fails.
   try {
-    colors = JSON.parse(process?.env?.COLORS)
-  } catch (e) {
-    // If this throws, process?.env?.COLORS wasn't parsable. Since we only
-    // care about `true` or `false`, we can safely ignore the error.
+    const colors = process?.env?.COLORS
+    if (colors) {
+      const b = JSON.parse(colors)
+      if (typeof b === 'boolean') return b
+    }
+  } catch {
+    // Ignore (non-critical) - Make a defaulting choice below.
   }
 
-  if (typeof colors === 'boolean') {
-    // If `colors` is set explicitly (both `true` and `false`), use that value.
-    return colors
-  } else {
-    // If `colors` is not set, colorize if we're in node.
-    return (
-      typeof process !== 'undefined' &&
-      process.versions !== undefined &&
-      process.versions.node !== undefined
-    )
-  }
+  // In all other cases, whether COLORS was a weird type, or the attempt threw:
+  // Fall back to colorizing if we are running in node.
+  return !!process?.versions?.node
 }
 
 const {DOMCollection} = prettyFormat.plugins