README.md

Typescript Transform

This is a tool for generating typescript from javascript. Contributions are welcome!

Getting Started

• npm i -g typescript-transform
• $ typescript-transform test-file.js

Usage:

Usage: typescript-transform <file> [options]

Options:
  -V, --version          output the version number
  -i, --interactive      Ask about each type before adding it
  -a, --auto             Pick the types for me
  -o, --output [output]  Output file. Defaults to stdout
  -h, --help             output usage information

• Run node index.js input.js -o output.ts to convert input.js to typescript and save it to output.ts.
• You will be prompted for every variable, function, and argument. To pick the default hit enter. To auto pick the types, pass the --auto option.
• To skip a type just enter skip.
• To use generics in a function enter template. This will walk you through creating a template.

Example:

Input

function add(a, b) {
    return a + b;
}

add('hello ', 'world');
add(1, 2);

const x = 1;
const arr = [1, 'one'];
const obj = { foo: 'bar' };

function getX() {
    return x;
}

function xPlusOne() {
    return getX() + 1;
}

function helloX() {
    return 'hello: ' + x;
}

Output

function add(a: string | number, b: string | number): string | number {
  return a + b;
}

add('hello ', 'world');
add(1, 2);

const x: number = 1;
const arr: [number, string] = [1, 'one'];
const obj = {
  foo: 'bar'
};

function getX(): number {
  return x;
}

function xPlusOne(): number {
  return getX() + 1;
}

function helloX(): string {
  return 'hello: ' + x;
}

Disclaimer

This tool is in very early stages.