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Figma (a UI design tool written in C++ compiled to JS using emscripten) talked about this briefly in their tech blog. They compiled FreeType to JS for rendering fonts to bitmaps: https://blog.figma.com/building-a-professional-design-tool-o...

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Figma actually only uses FreeType for parsing fonts (fonts are rendered using a custom WebGL-based renderer). Figma uses HarfBuzz for text shaping, which is easy to run on the web with emscripten: https://github.com/harfbuzz/harfbuzz.

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