Changelog: swc v1.2.36

Bugfixes

export * as ns (#1142)

swc now handle export * as ns from 'foo'; by default, if you are targeting < es2020.

Also, spack and swc_bundler now supports it directly.

conditional expression in await (#1133)

swc errornously removed parenthesis of conditional expression in await expressions.

scope of optional chaining (#1136)

Previously, swc miscompiled the code below.

const PATCHES = new Map();

const ident = "foo";

const patch = PATCHES.get(ident)?.();

This was compiled as

var _obj = PATCHES.get(ident),

ref;

const PATCHES = new Map();

const ident = "foo";

const patch = (ref = _obj) === null || ref === void 0 ? void 0 : ref.call(_obj);

Which results in a runtime error. This is caused by sharing variable buffer. It's fixed by using two variable buffers.

computed keys in object literal (#1140)

The hygiene pass of swc had a bug. The bug was that it does not visit key in { [key]: value }.

This is fixed, and code like below works properly.

const categories = [{ key: "apple" }, { key: "banana" }, { key: "strawberry" }];

const item = "some item";

const catNames = categories.reduce((a, item) => {

return { ...a, [item.key.toString()]: item };

}, {});

bundler: deglob imports correctly (#1139)

import * as circular2 from "./circular2.ts";

export function f1(): void {

console.log("f1");

}

circular2.f2();

Previously, the code above was bundled as

export function f1() {

console.log("f1");

}

circular2.f2();

circular1.f1();

which is clearly wrong. It's now fixed.

bundler: aliased imports (#1138)

This bug occurs if nested export is mixed with aliased import.

a.ts:

export const a = "a";

l.ts:

export { a } from "./a.ts";

entry.ts:

import { a as defaultA } from "./l.ts";

const o: { a?: string } = {};

const { a = defaultA } = o;

console.log(a);

This resulted in

const o = {};

const { a = defaultA } = o;

console.log(a);

which is wrong. It's now fixed and swc_bundler now supports quite complex imports.

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