string-byte-slice/build/src/validate.js

Like `string.slice()` but bytewise

export const validateInput=(input,byteStart,byteEnd)=>{
if(typeof input!=="string"){
throw new TypeError(`First argument must be a string: ${input}`)
}

validateByteStart(byteStart);
validateByteEnd(byteEnd)
};

const validateByteStart=(byteStart)=>{
if(byteStart===undefined){
throw new TypeError("Second argument is required.")
}

validateIndex("Second",byteStart)
};

const validateByteEnd=(byteEnd)=>{
if(byteEnd!==undefined){
validateIndex("Third",byteEnd)
}
};

const validateIndex=(name,byteIndex)=>{
if(!Number.isInteger(byteIndex)){
throw new TypeError(`${name} argument must be an integer: ${byteIndex}`)
}
};