GitHub - LeDDGroup/typescript-transform-macros: Typescript Transform Macros (original) (raw)

typescript-transform-macros

Typescript Transform Macros

Examples from https://github.com/codemix/babel-plugin-macros.

Installation

npm install --save-dev typescript-transform-macros

Usage with ttypescript

Add it to plugins in your tsconfig.json

{ "compilerOptions": { "plugins": [{ "transform": "typescript-transform-macros" }] } }

Also declare globally the MACRO function:

declare function MACRO(t: T): T;

Example

Input:

declare function MACRO(t: T): T;

const MAP = MACRO( <T, L>( inputConst: T[], visitor: (value: T, index?: number, input?: T[]) => L ) => { const input = inputConst; const length = input.length; const result = new Array(length) as L[]; for (let i = 0; i < length; i++) { result[i] = visitor(input[i], i, input); } return result; } );

declare interface Array { MAP: Array["map"]; }

console.log([1, 2, 3].MAP(n => 3 * n + 1));

Output:

"use strict"; const input_1 = [1, 2, 3]; const length_1 = input_1.length; const result_1 = new Array(length_1); for (let i_1 = 0; i_1 < length_1; i_1++) { result_1[i_1] = 3 * input_1[i_1] + 1; } console.log(result_1); //> [ 4, 7, 10 ]