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Add first-class TypeScript types to the project. They'll be maintained in the repo from now on. #139
Improve matching performance by ~22%. #150

@NathanMOlson

Potentially breaking: improve handling of semitransparent pixels. Previously, they were blended with white, so a transparent pixel vs white pixel would show zero difference; now pixels are blended with an irregular pattern, making it easier to catch regressions. (h/t @NathanMOlson #142)
Improve match performance by ~6%. #147
Significantly improve diff generation performance. (h/t @kawanet #105)
Fix options handling to use the default value when undefined is passed explicitly. (h/t @denis-sokolov #146)
Fix ESLint failing on Windows when working on the library locally. (h/t @haraldreingruber-dedalus #123)

⚠️ Breaking: publish pixelmatch as a ES module. Use the older v5.3.0 if you need to support CommonJS environments.

Upgrade pngjs dependency (used in the pixelmatch CLI) from v4 to v6.

@tristen

Added a diffColorAlt option for coloring pixels that got darker differently (for differentiating between "added" and "removed" parts). #87 (h/t @tristen)
Dropped Node v4/v6 support in the binary.

@tmeasday

Added diffMask option. #73 (h/t @tmeasday)

@dreignier

⚠️ Breaking: update to ES6 syntax, dropping Node <6.4 and IE11 support.
🎨 Added configurable diff output (options alpha, aaColor, diffColor) (@dreignier @VP-)
⚡️ Improve matching performance by ~35%.
⚡️ Bypass detailed comparison when image data is identical, significantly improving performance when running tests on CI #60 (thanks to @bontscho).
Fix anti-aliasing detection on image edges #51 (@IvanSanchez).
Produce a meaningful error when image data is in the wrong format #53 (thanks to @LearningNerd)
CLI: return non-zero exit code when images differ #54 (@maio).
CLI: make diff output optional.
Make the published NPM module smaller.

Fixed the command-line to properly handle the case when threshold is not provided.

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