problem description
the development environment builds the TS code with Rollup, converts it to ES5, and configures it as follows:
// rollup.config.js
import typescript from "rollup-plugin-typescript2"
import buble from "rollup-plugin-buble"
import babel from "rollup-plugin-babel"
export default {
input: "src/index.ts",
output: [
{
file: "dist/index.js",
format: "es",
},
],
plugins: [
typescript(),
babel({
babelrc: false,
presets: [["env", { modules: false }]],
}),
buble()
],
}// tsconfig.js
{
"compilerOptions": {
"moduleResolution": "node",
"lib": ["es2015", "es2016", "es2017", "dom"],
"declaration": true,
"target": "es5",
"module": "es6",
"outDir": "./dist/",
"strict": true,
"esModuleInterop": true,
"experimentalDecorators": true
}
}the environmental background of the problems and what methods you have tried
The problem withis that after the code has been compiled, ES6+ functions like Array.from, Map, and Set are not compiled into an implementation of ES5.
related codes
// TS
class Greeter {
getArr(arr:number[]) {
return Array.from(new Set(arr))
}
}
const greet = new Greeter();
console.log(greet.getArr([1, 4, 2, 3, 4]))
=====
// "ES5"
var Greeter = /** @class */ (function () {
function Greeter() {
}
Greeter.prototype.getArr = function (arr) {
//
return Array.from(new Set(arr));
};
return Greeter;
}());
var greet = new Greeter();
console.log(greet.getArr([1, 4, 2, 3, 4]));what result do you expect? What is the error message actually seen?
so here"s the problem. The babel in the configuration doesn"t seem to have any effect.
how should I add polyfill plug-ins such as core-js? Thank you!