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Although prop-types is meant to run only on development environments, it still is a package required in production code.
Having prop-types under devDependencies means that whoever wants to use react-lottie will get a module not found error for it. Also the recomendation from prop-types team is to add their package as dependencies not devDependencies. You can see this on "How to Depend on This Package?" section on their npm page https://www.npmjs.com/package/prop-types