jest-less-loader

--- install scripts ---
### prepublishOnly
npm run build



--- package.json (entry) ---
{
  "name": "jest-less-loader",
  "version": "0.2.0",
  "description": "Jest transformer for .less file.",
  "license": "MIT",
  "main": "lib/index.js",
  "files": [
    "lib"
  ],
  "scripts": {
    "clean": "rimraf -rf lib",
    "lint": "eslint src/**/*.ts __tests__/**/*.ts",
    "lint-staged": "lint-staged",
    "test": "jest --no-cache",
    "ci": "npm run lint && npm run test && lint-md .",
    "start": "tsc -w",
    "build": "rimraf ./lib && tsc --module commonjs --outDir lib",
    "prepublishOnly": "npm run build"
  },
  "dependencies": {},
  "peerDependencies": {
    "less": "^4.1.3"
  },
  "keywords": [
    "jest",
    "less",
    "transformer"
  ],
  "devDependencies": {
    "@commitlint/cli": "^8.2.0",
    "@types/jest": "^24.0.18",
    "@types/node": "^12.12.14",
    "@typescript-eslint/eslint-plugin": "^2.3.1",
    "@typescript-eslint/parser": "^2.3.1",
    "eslint": "^6.4.0",
    "eslint-config-prettier": "^6.3.0",
    "husky": "^3.0.5",
    "jest": "^24.9.0",
    "jest-electron": "^0.1.7",
    "less": "^4.1.3",
    "lint-md-cli": "^0.1.1",
    "lint-staged": "^9.3.0",
    "prettier": "^1.18.2",
    "rimraf": "^3.0.0",
    "ts-jest": "^24.1.0",
    "typescript": "^3.6

--- index.js (entry) ---
"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var less_1 = __importDefault(require("less"));
/**
 * transform less sync
 * @param fileContent
 * @param filePath
 */
function transformLess(fileContent, filePath) {
    var data = fileContent.replace(/^\uFEFF/, '');
    // handle with fileContent include @import url
    // paths used for search less file from node_modules, such as `@import '@lib/index.less'`
    var options = { sync: true, syncImport: true, relativeUrls: true, filename: filePath, paths: ['node_modules'] };
    var css = '';
    less_1.default.render(data, options, function (err, result) {
        if (err)
            throw err;
        css = result.css;
    });
    return css;
}
/**
 * inject style css into header
 * @param css
 */
function injectStyle(css) {
    var head = document.getElementsByTagName('head')[0];
    var style = document.createElement('style');
    style.type = 'text/css';
    style.appendChild(document.createTextNode(css));
    head.appendChild(style);
}
/**
 * the transformer entr