Teaching coding and computational thinking is an emerging educational imperative, now embedded in compulsory curriculum in the United States, Finland, the UK, Germany, Belgium, the Netherlands, New Zealand, and Australia. This meta-synthesis of 49 studies critically reviews recent international research (2009-2022) of coding and computational thinking as core and integrated across the curriculum. It addresses four essential problems: (a) What are the key features of learning environments that successfully develop students' coding and computational thinking? (b) What is the impact of student engagement in coding and computational thinking on learning outcomes across curriculum areas? (c) What pedagogical constraints are evident for coding and computational thinking, including across curriculum areas? and (d) Which conceptual frameworks support coding and computational thinking, and what has been marginalized or excluded? The review advances knowledge of coding and computational thinking--vital to guide and develop future AI-based solutions to real-world problems that challenge disciplinary boundaries.