Test API with caniuse and a given browserslist

.browserslistrc

>0.2%
not dead
not ie < 11
not op_mini all
not safari 5.1

README.md

• npm i
• npm run caniuse
• Modify .browserslistrc as desired
• Example pass: "What API do you want to test support for?" history
• Example fail: "What API do you want to test support for?" es6

caniuse.mjs

import caniuse from "caniuse-api";
import browserslist from "browserslist";

import readline from "readline";

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
});

const prompt = () =>
  new Promise((resolve) => {
    rl.question("What API do you want to test support for? ", function (resp) {
      resolve(resp);
    });
  });

const test = (api) => {
  let pass = true;
  // Create a support matrix object
  const list = {};
  // For each browserslist key (UA type) set the lowest version that needs to be supported
  browserslist().forEach((entry) => {
    const keyVal = entry.split(" ");
    if (typeof list[keyVal[0]] === "undefined" || list[keyVal[0]] > keyVal[1]) {
      list[keyVal[0]] = parseFloat(keyVal[1]);
    }
  });
  // Get caniuse support details for passed in API
  const supportList = caniuse.getSupport(api, true);
  // Create an object to match the structure of the support matrix
  const supported = {};
  // Find minimum versions for each UA that support the passed in API
  Object.keys(supportList).forEach((ua) => {
    // May need to check `supportList[ua]` and `supportList[ua]["y"] exist, not sure
    supported[ua] = supportList[ua]["y"]; // "y" is full support
  });
  Object.keys(supported).forEach((ua) => {
    if (supported[ua] > list[ua]) {
      pass = false;
    }
  });
  console.info("Your browserslist with minimum versions:");
  console.info(list);
  console.info(`List of minimum versions that support ${api}:`);
  console.info(supported);
  console.info(`Pass? ${pass}`);
};

prompt()
  .then((response) => {
    test(response);
    process.exit(0);
  })
  .catch((error) => {
    console.error(error);
    process.exit(1);
  });

package.json

{
  "name": "caniuse",
  "version": "1.0.0",
  "description": "Test feature/API support according to browserslist",
  "main": "index.js",
  "dependencies": {
    "caniuse-lite": "^1.0.30001191",
    "colorette": "^1.2.1",
    "electron-to-chromium": "^1.3.672",
    "escalade": "^3.1.1",
    "lodash.memoize": "^4.1.2",
    "lodash.uniq": "^4.5.0",
    "node-releases": "^1.1.70"
  },
  "devDependencies": {
    "browserslist": "^4.16.3",
    "caniuse-api": "^3.0.0"
  },
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "caniuse": "node caniuse.mjs"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}