safe-json-value/build/src/get.js

⛑️ JSON serialization should never fail

import normalizeException from"normalize-exception";


export const safeGetChangeProp=({parent,key})=>{
try{
return parent[key]
}catch{}
};





export const safeGetProp=({parent,key,changes,path})=>{
try{
const prop=getProp({parent,key,changes,path});
return{prop,safe:true}
}catch(error){

changes.push({
path,
oldValue:undefined,
newValue:undefined,
reason:"unsafeGetter",
error:normalizeException(error)
});
return{prop:undefined,safe:false}
}
};



const getProp=({parent,key,changes,path})=>{
const descriptor=Object.getOwnPropertyDescriptor(parent,key);
const prop=parent[key];
addGetterChange({changes,path,prop,descriptor});
addDescriptorChange({changes,path,prop,descriptor});
return prop
};


const addGetterChange=({changes,path,prop,descriptor:{get,set}})=>{
if(get!==undefined||set!==undefined){

changes.push({
path,
oldValue:get,
newValue:prop,
reason:"unresolvedGetter"
})
}
};


const addDescriptorChange=({
changes,
path,
prop,
descriptor:{writable,configurable}
})=>{
if(writable===false){

changes.push({
path,
oldValue:prop,
newValue:prop,
reason:"descriptorNotWritable"
})
}

if(configurable===false){

changes.push({
path,
oldValue:prop,
newValue:prop,
reason:"descriptorNotConfigurable"
})
}
};