This package intent is to make "safe" JavaScript runtime by checking types at runtime and disallowing most of implicit coercion

In Node project add in package.json:

  "main": "dist/index.js",
  "scripts": {
    "prepare": "safec ./src -d ./dist --src-map true --allow-ts",
    "start": "npm run prepare && node ./dist/index.js"
  },
  "devDependencies": {
    "typescript-plugin-safescript": "^0.5.3"
  },
  "dependencies": {
    "@redradist/module-runtime-safescript": "^0.4.1"
  }

Then in your main script before any code import @redradist/module-runtime-safescript runtime:

import "@redradist/module-runtime-safescript";

let y = 8;

...

y += "233"; // Possible error behaviour

...

The dist/index.js will look like:

import "@redradist/module-runtime-safescript";

let y = 8;

...

y = SafeScript.add(y, "233"); // SafeScript will throw TypeError exception

...

Now you can go in your code and fix the issue:

import "@redradist/module-runtime-safescript";

let y = 8;

...

y += Number("233"); // Now it is "safe" behaviour

...

Using this SafeScript runtime fills like Python on V8 ;)

The Philosophy of SafeScript:

1. Allow subset of "safe" operations in JavaScript and TypeScript
2. Do not introduce a new valid behaviour in runtime, in such way it is easier just to remove SafeScript runtime at anytime