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next-swc.test.ts
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next-swc.test.ts
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/* eslint-env jest */
import { transform } from 'next/dist/build/swc'
const swc = async (code) => {
let output = await transform(code)
return output.code
}
const trim = (s) => s.join('\n').trim().replace(/^\s+/gm, '')
describe('next/swc', () => {
describe('hook_optimizer', () => {
it('should leave alone array destructuring of hooks', async () => {
const output = await swc(
trim`
import { useState } from 'react';
const [count, setCount] = useState(0);
`
)
expect(output).toMatchInlineSnapshot(`
"function _array_like_to_array(arr, len) {
if (len == null || len > arr.length) len = arr.length;
for(var i = 0, arr2 = new Array(len); i < len; i++)arr2[i] = arr[i];
return arr2;
}
function _array_with_holes(arr) {
if (Array.isArray(arr)) return arr;
}
function _iterable_to_array_limit(arr, i) {
var _i = arr == null ? null : typeof Symbol !== "undefined" && arr[Symbol.iterator] || arr["@@iterator"];
if (_i == null) return;
var _arr = [];
var _n = true;
var _d = false;
var _s, _e;
try {
for(_i = _i.call(arr); !(_n = (_s = _i.next()).done); _n = true){
_arr.push(_s.value);
if (i && _arr.length === i) break;
}
} catch (err) {
_d = true;
_e = err;
} finally{
try {
if (!_n && _i["return"] != null) _i["return"]();
} finally{
if (_d) throw _e;
}
}
return _arr;
}
function _non_iterable_rest() {
throw new TypeError("Invalid attempt to destructure non-iterable instance.\\\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}
function _sliced_to_array(arr, i) {
return _array_with_holes(arr) || _iterable_to_array_limit(arr, i) || _unsupported_iterable_to_array(arr, i) || _non_iterable_rest();
}
function _unsupported_iterable_to_array(o, minLen) {
if (!o) return;
if (typeof o === "string") return _array_like_to_array(o, minLen);
var n = Object.prototype.toString.call(o).slice(8, -1);
if (n === "Object" && o.constructor) n = o.constructor.name;
if (n === "Map" || n === "Set") return Array.from(n);
if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _array_like_to_array(o, minLen);
}
import { useState } from "react";
var _useState = _sliced_to_array(useState(0), 2), count = _useState[0], setCount = _useState[1];
"
`)
})
it('should leave alone array spread of hooks', async () => {
const output = await swc(
trim`
import { useState } from 'react';
const [...copy] = useState(0);
`
)
expect(output).toMatchInlineSnapshot(`
"function _array_like_to_array(arr, len) {
if (len == null || len > arr.length) len = arr.length;
for(var i = 0, arr2 = new Array(len); i < len; i++)arr2[i] = arr[i];
return arr2;
}
function _array_with_holes(arr) {
if (Array.isArray(arr)) return arr;
}
function _iterable_to_array(iter) {
if (typeof Symbol !== "undefined" && iter[Symbol.iterator] != null || iter["@@iterator"] != null) return Array.from(iter);
}
function _non_iterable_rest() {
throw new TypeError("Invalid attempt to destructure non-iterable instance.\\\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}
function _to_array(arr) {
return _array_with_holes(arr) || _iterable_to_array(arr) || _unsupported_iterable_to_array(arr) || _non_iterable_rest();
}
function _unsupported_iterable_to_array(o, minLen) {
if (!o) return;
if (typeof o === "string") return _array_like_to_array(o, minLen);
var n = Object.prototype.toString.call(o).slice(8, -1);
if (n === "Object" && o.constructor) n = o.constructor.name;
if (n === "Map" || n === "Set") return Array.from(n);
if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _array_like_to_array(o, minLen);
}
import { useState } from "react";
var _useState = _to_array(useState(0)), copy = _useState.slice(0);
"
`)
})
})
})