Write one file to the marked location of another file

Will file A Write to file B The location of the identifier

Ideas

sed -i ‘’ ‘10r file-a.js’ ./file-b.js
lookup identifier grep -n -r insertModuleFile ./file-b.js | awk -F “{ print $2 }”

Realization

file A

function ModuleFile(){
    
	//  This is a test file 
}

file B

function getModuleFile(){
    
	// insertModuleFile
}

Expected results

function getModuleFile(){
    
	// insertModuleFile
function ModuleFile(){
    
	//  This is a test file 
}
}

Script

sed -i '' "$(grep -n -r insertModuleFile ./file-B.js | awk -F : '{ print $2 }')r ./file-A.js" ./file-B.js

Script

sed -i '' "$(grep -n -r insertModuleFile ./worklet-process-sed.js | awk -F : '{ print $2 }')r ./dist/Math.js" ./worklet-process-sed.js