constantin

create constant objects/array/... by deep object.defineProperty

$ npm install constantin --save

const constantin = require('constantin');
 
let myObject = {
  a: 123,
  b: {
    c: [ 1, 2, 3]
  }
};
 
if (environment !== 'production') {
  const options = {
    own: false,
    name: 'myObject'
  };
 
  myObject = constantin(myObject, options);
}
 
const a = constantin.c; // throws error. c is not defined
 
constantin.c = 4; // throws error. you should not modify constant

Options

name

optional - String - default "". - shows in error message

allowedProps

optional - Array(String) - default []. - ignore prop names

checkValue(value, pathArray)

optional - Function - default () => {}. - additional check value on every depth of Object/Array

skipSymbols

optional - Boolean - default true. - skip every symbols that will be checked by some library

own

optional - Boolean - default true. - checking props in objects by hasOwnProperty

If you try to change any value inside - it throws an exception