beautiful-error/build/src/header.js

💣 Prettify error messages and stacks 💥

import chalkString from"chalk-string";


export const validateHeader=(value,optName)=>{
if(typeof value!=="string"){
throw new TypeError(`"${optName}" must be a string: ${value}`)
}

if(value===""){
return
}

try{
chalkString(value)
}catch(error){
throw new Error(
`"${optName}" ${value} must be a valid style: ${error.message}`
)
}
};


export const applyHeader=({messageLines,useColors,theme,error})=>{
if(theme.header===undefined||!useColors){
return messageLines
}

const[firstMessageLine,...messageLinesA]=messageLines;
const firstMessageLineA=applyHeaderLine(firstMessageLine,theme,error);
return[firstMessageLineA,...messageLinesA]
};

const applyHeaderLine=(firstMessageLine,theme,error)=>{
const endIndex=getEndIndex(firstMessageLine,error);

if(endIndex===-1){
return firstMessageLine
}

const start=firstMessageLine.slice(0,endIndex);
const end=firstMessageLine.slice(endIndex);
return`${theme.header(start)}${end}`
};

const getEndIndex=(firstMessageLine,error)=>{
const endIndex=firstMessageLine.indexOf(":");

if(endIndex!==-1){
return endIndex+1
}

return firstMessageLine.endsWith(error.name)?
firstMessageLine.length:
endIndex
};