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149 Commits

Author SHA1 Message Date
Austaras
9893bd2d43
refactor(es/minifier): Respect toplevel and module options (#7671) 2023-07-20 11:35:08 +09:00
Donny/강동윤
6be1f7075d
fix(es/minifier): Fix a bug about eval of name mangler (#7615) 
**Description:**

 - Repro: https://github.com/avitorio/swcminify-debug


**Related issue:**

 - https://github.com/vercel/next.js/discussions/30237#discussioncomment-6288339
 2023-07-18 01:09:00 +00:00
Austaras
ff1ad95b59
feat(es/minifier): Compress common sub expressions in sequences (#7587) 2023-07-04 05:47:37 +00:00
Donny/강동윤
47d2edd4dc
feat(es/minifier): Drop unused properties (#7534) 
**Related issue:**

 - Closes #7472.
 2023-07-04 05:11:33 +00:00
Donny/강동윤
07a858030c
feat(es/minifier): Enable hoist_props by default (#7535) 2023-06-21 18:38:35 +09:00
Austaras
7f9f0b8bce
fix(es/minifier): Infect mutation when assigning a property (#7503) 2023-06-08 04:13:42 +00:00
David Sherret
064bcf4854
fix(es/codegen): Remove extra spaces in AssignPatProp and KeyValuePatProp (#7488) 
Co-authored-by: Donny/강동윤 <kdy1997.dev@gmail.com>
 2023-06-07 05:08:35 +00:00
Austaras
62075faeaa
feat(es/minifier): Remove unused labels (#7478) 2023-06-07 04:23:40 +00:00
Austaras
0cd2b61b05
feat(es/minifier): Inline for loop variables (#7445) 2023-05-25 03:59:02 +00:00
Austaras
40d2bf7ec3
fix(es/minifier): Prevent inlining vars assigned outside current function scope (#7414) 
**Related issue:**

 - Closes #7412.
 2023-05-19 13:35:50 +09:00
Austaras
5dbbbea2ef
fix(es/minifier): Mark all function params as potential property mutation (#7409) 
**Description:**

This issue is more severe than I originally thought. It raises not in
array indexing, but in function calls and property mutation. We should
treat all function arguments as potentially be property mutated,
otherwise following example

```js
class A {
	a = 1

	toString() {
		return this.a
	}
}

const a = new A()

function foo(x) {
	x.a++
}

const b = a + 1

foo(a)

console.log(b)
```

would be error(It should log 2, but logs 3 after compress).

As the result, massive regressions is unavoidable, since some of these
optimizations may indeed cause error. Part of them can be mitigated with
following optimization -- allow inline of ident even if its original
value is mutated. Consider

```js
export function foo(x) {
   const y = x
   x.a = 1
   y.b = 2
}
```

If x is a primitive value, all mutations to its properties are ignored;
if x is a object, then y refers to the same object no matter what
mutation is performed.

And there's still room for more, currently following code
```js
export function foo(x) {
    const y = Math.floor(x);
    g(y);
}
```
But I'd rather do it in a separate PR.


**Related issue:**

 - Closes #7402.
 2023-05-18 01:19:17 +00:00
Donny/강동윤
1dced17998
fix(es/minifier): Fix remapping of vars upon inlining (#7362) 
**Related issue:**

 - Closes #7331.
 2023-05-10 03:31:15 +00:00
Donny/강동윤
246300ae25
feat(es/minifier): Drop expressions using sequential inliner (#6936) 2023-04-29 22:19:00 +09:00
Donny/강동윤
6d9763e8c0
fix(es/renamer): Don't use symbols used by declarations if eval exists (#7116) 
**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/6971.
 - Closes https://github.com/swc-project/swc/issues/7094.
 2023-03-22 06:31:43 +00:00
Donny/강동윤
610e1bb581
fix(es/minifier): Don't inline into arrow heads (#7099) 
**Related issue:**

 - https://github.com/vercel/next.js/issues/47005
 2023-03-22 02:24:13 +00:00
Donny/강동윤
6a570a334c
fix(es/ast): Fix EqIgnoreSpan impl of Number (#7112) 
**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/7111.
 2023-03-21 08:46:22 +00:00
Anders Kaseorg
493a4f7042
fix(es/minifier): Remove wrong optimization of new RegExp(…) (#7091) 2023-03-17 03:22:02 +00:00
Donny/강동윤
86295ba8f2
fix(es/minifier): Preserve delete of unresolved variables (#7072) 
**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/7045.
 2023-03-15 02:31:08 +00:00
Austaras
06cbb9002d
feat(es/minifier): Optimize calls to Boolean/Number/String/Symbol (#7006) 2023-03-04 04:14:14 +00:00
Austaras
cfeb088c37
fix(es/minifier): Don't skip expressions with side effects from seq inliner (#7007) 2023-03-04 12:32:15 +09:00
Austaras
55225cb994
refactor(es/minifier): Merge cond_init with reassigned (#6850) 
**Description:**

And optimize the following situation
```js
export function genElement(el, state) {
    if ('slot' === el.tag) return el1 = el, genChildren(el1);
    if (el.component) {
        var el1
        return 999;
    }
}
```
which rarely happens in hand written JS, but is often generated by swc merge variable pass.
 2023-01-26 10:17:33 +09:00
Donny/강동윤
21e14787c5
fix(es/minifier): Don't inline into await from sequential inliner (#6839) 
**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/6837.
 2023-01-20 08:50:51 +00:00
Donny/강동윤
df702614e1
fix(es/codegen): Fix codegen of string literals with \x000 (#6838) 
**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/6836.
 2023-01-20 08:08:58 +00:00
HeYunfei
a1ccc8afdf
feat(es/minifier): Make name mangler understand block scoping (#6670) 
**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/5090.
 - Closes https://github.com/swc-project/swc/issues/5766.
 2023-01-06 03:14:10 +00:00
Donny/강동윤
bb9fab8d03
fix(es/minifier): Abort IIFE invoker completely on eval (#6659) 
**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/6628.
 2022-12-15 07:49:58 +00:00
Donny/강동윤
8b2e1d17e5
fix(es/minifier): Abort IIFE invoker on eval (#6478) 
**Related issue:**

 - https://github.com/vercel/next.js/issues/43052.
 2022-12-13 04:18:57 +00:00
Donny/강동윤
9752b43f94
fix(es/minifier): Use unsafe option for arrow => method (#6521) 
**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/6504.
 - https://github.com/vercel/next.js/issues/43208.
 2022-11-29 05:23:55 +00:00
Donny/강동윤
27ae59e77b
fix(es/minifier): Make sequential inliner respect resolution order (#6509) 
**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/6491.
 2022-11-29 04:50:15 +00:00
Donny/강동윤
b394f9f1d3
fix(es/minifier): Don't drop used variables from sequential inliner (#6520) 
**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/6510.
 2022-11-29 04:12:11 +00:00
Donny/강동윤
5fd7ab87b6
fix(es/minifier): Preserve op of the op-assignments in seq inliner (#6428) 
**Description:**


**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/6407.
 2022-11-15 00:22:06 +00:00
Donny/강동윤
dd797f7f15
fix(es/minifier): Don't drop an inlined parameter as a duplicate (#6293) 2022-11-02 01:57:15 +00:00
Donny/강동윤
5d52ae971e
feat(es/minifier): Implement trivial optimizations (#6256) 
**Description:**

1. Evaluate `Number.toString()`.
2. Mark some terser tests as passing where our output is better.
 2022-11-02 01:21:32 +00:00
Donny/강동윤
0376da73c6
test(es/minifier): Add a test for ?? operator (#6282) 
**Related issue:**

 - https://github.com/vercel/next.js/issues/41992.
 2022-10-28 08:00:21 +00:00
Donny/강동윤
743a1aab4f
feat(es/minfiier): Compute more with sequential inliner (#6169) 2022-10-27 00:50:52 +00:00
Austaras
1cd7f617f9
feat(es/minifier): Inline a lazily initialized var if it's used once (#6237) 2022-10-26 06:02:22 +00:00
Donny/강동윤
86e265a024
feat(es/minifier): Support more statements in seqential inliner (#6248) 
**Description:**

We now inline into the discriminant of a switch statement and into the initializer of for/for-in/for-of statements.
 2022-10-26 13:37:10 +09:00
Donny/강동윤
780b5de678
fix(es/minifier): Fix detection of direct eval (#6215) 2022-10-21 12:18:10 +09:00
Donny/강동윤
12443db39a
feat(es/minifier): Merge functions using sequential inliner (#6148) 2022-10-20 02:24:09 +00:00
Donny/강동윤
842abd4575
fix(es/minifier): Remove wrong rule (#6201) 
**Related issue:**

 - https://github.com/vercel/next.js/issues/41527.
 2022-10-19 02:14:38 +00:00
Donny/강동윤
f2e8f98d38
feat(es/minifier): Skip function declarations in sequential inliner (#6147) 2022-10-18 02:51:05 +00:00
Donny/강동윤
3f0fcf4fa9
feat(es/minifier): Make sequential inliner self-repeat (#6168) 2022-10-18 02:13:39 +00:00
Austaras
b40d486253
fix(es/minifier): Consider function body cost while inlining function (#5342) 2022-10-15 05:47:56 +00:00
Donny/강동윤
6d0ca05cb5
fix(es/minifier): Fix ordering issue of analyzer (#6150) 
**Description:**

This is the groundwork for a parallel analyzer. This PR fixes the ordering issue of the analyzer so that the analyzer works identically regardless of the visit order. This patch contains some improvements because previously, we mixed `.and_modify()` and `.or_default()`.
 2022-10-15 04:37:11 +00:00
Donny/강동윤
d334c6e783
feat(es/minifier): Ignore return value if a param of IIFE is not used (#6115) 2022-10-14 02:58:00 +00:00
Donny/강동윤
3d271e82a2
fix(es/minifier): Preserve return values of recursive IIFE (#6142) 
**Description:**

This PR fixes the logic for dropping return values of IIFE.

**Related issue:**

 - Closes https://github.com/swc-project/swc/issues/6141.
 2022-10-14 09:32:56 +09:00
Donny/강동윤
5875298377
feat(es/minifier): Merge assignments using sequential inliner (#6103) 2022-10-12 05:31:40 +00:00
Donny/강동윤
66196a65be
feat(es/minifier): Inline pure array literal partially (#6099) 2022-10-12 02:29:40 +00:00
Donny/강동윤
ad960c76c0
feat(es/minifier): Detect type of .length (#6120) 
**Description:**

This PR updates minifier to detect the type of `xxx.length` if possible.
 2022-10-11 23:06:58 +00:00
Austaras
657e5b3111
feat(es/minifier): Inline more lazily initialized vars (#6089) 2022-10-10 09:53:50 +09:00
Donny/강동윤
b0c57458c8
feat(es/minifier): Mark ref to fn as non-call in alias analyzer (#6088) 2022-10-09 09:21:54 +09:00