feat: mangle Infinity #1385
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feat: mangle Infinity #1385
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added 2 commits
June 19, 2021 22:25
This change will shave some bytes when the code is using `Infinity`. The ECMA definition of divide can return (-)Infinity based of the second value in specif when it's zero. And based on the first value it will be positive or negative. See: https://tc39.es/ecma262/#sec-numeric-types-number-divide It should be a small change and not break any code. And any existing code should play along nice Simplified ```js Infinity**2 1/0**2 ``` Hereby ** has priority over the `/` and could break the code, but now it's nice about `1` and `0` they won't change at all, doesn't matter which expressions you try to use with which numbers. And `1` could be set to 0 with ```js 0 * 1/0 0 * Infinity ``` But in both cases printed NaN like it should behave. Regards, Gusted
bathos
reviewed
Jun 19, 2021
Co-authored-by: Darien Maillet Valentine <[email protected]>
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Seems like the Uglify tests are failing because |
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The lack of parentheses causes other issues too. For example, turning |
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Sure thing 👍🏽, Il be interested in the final (golang) code for this one. |
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It looks like you have perhaps disallowed edits from maintainers on your branch. At least I am unable to push to it (I get permission denied). Can that setting be changed on your end? |
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Ah sorry. I always forget that GitHub's handy command line instructions rename the branch to something else, which breaks this workflow. I figured it out. |
Gusted
commented
Jun 24, 2021
| expectPrintedMangleMinify(t, "x = -Infinity", "x=-1/0;") | ||
| expectPrintedMangleMinify(t, "x = (Infinity).toString", "x=(1/0).toString;") | ||
| expectPrintedMangleMinify(t, "x = (-Infinity).toString", "x=(-1/0).toString;") | ||
| expectPrintedMangleMinify(t, "x = Infinity ** 2", "x=(1/0)**2;") |
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I've might overlook this but 1/0 ** 2 will result in Infinity as well. Can the parentheses be "turned off" for different level's? Or will that cause more problems 😅.
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The expressions (a / b) ** c and a / (b ** c) have different ASTs. Having minification turn one into the other is not generally correct, even if it's correct in that specific case. For example, changing console.log(0 ** Infinity ** 1); into console.log(0 ** 1 / 0 ** 1); changes the output from 0 to NaN.
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Got it, thanks for the explanation 🎉
eduardoboucas
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Dec 3, 2021
* fix evanw#1327: improve lowered template literals * fix(linker): order of css imported from js (evanw#1342) * release notes for evanw#1342 * update compat-table * fix for "export default class" transform (evanw#1346) * publish 0.12.6 to npm * add support for es5-style identifiers (evanw#1349) * runtime: remove "__platform" flag * runtime: remove "__profiler" flag * runtime: check "for-of" not "=>" for es6 support * fix evanw#1349: quote modern unicode object properties * fix evanw#1355: ignore tsconfig.json in node_modules * fix evanw#1357: "--metafile" with "--watch" * fix(linker): add missing esm flag (evanw#1338) * Allow OnResolve plugins to mark modules as side effect free (evanw#1313) * publish 0.12.7 to npm * fix evanw#1358: remove warning about source map comment * publish 0.12.8 to npm * fix evanw#1361: allow "this" with "--define" * fix evanw#1372: css minification bug with !important * publish 0.12.9 to npm * avoid checking "browser" for other platforms * add an "es2021" target * Avoid exporting a pointer to a loop variable in linker (evanw#1389) The Bazel nogo (Go lint config) errored when I tried to compile esbuild: compilepkg: nogo: errors found by nogo during build-time code analysis: external/com_github_evanw_esbuild/internal/bundler/linker.go:3309:27: exporting a pointer for the loop variable stmt (export_loop_ref) The simplified code nogo complains about is: for _, stmt := range partStmts { stmt.Data = &js_ast.SImport{ StarNameLoc: &stmt.Loc, } } The problem is `&stmt.Loc` points to the mutated loop variable `stmt`. After the loop iteration ends, all stored pointers will point to the last value of `partStmts[-1].Loc`. An alternative solution is to shadow `stmt` at the beginning of the loop, but this felt cleaner: stmt := stmt The lint rule is defined by https://github.com/kyoh86/exportloopref. * feat: mangle Infinity (evanw#1385) * add support for shorten transform/translate3d (evanw#1390) * css: implement minification for all matrix forms * fix evanw#1397: support "s" in css attribute selectors * publish 0.12.10 to npm * fix evanw#1399: avoid "os.MkdirAll" to fix WebAssembly * fix evanw#1396: improve invalid loader error message * improve sync performance of js api by ~20x (evanw#1000) * fix windows issues * publish 0.12.11 to npm * move unique key prefix from compile to scan phase * add "C" to unique keys for chunks * fix evanw#1044: correct relative paths for file loader * fix a windows path issue * publish 0.12.12 to npm * Fix using JS synchronous API from from non-main threads (evanw#1411) * publish 0.12.13 to npm * keep wasm tests self-contained * factor out some code related to "outfile" * pull out relative-to-outbase code * fix evanw#1404: "file" loader always copies to "outdir" * publish 0.12.14 to npm * fix evanw#1421: bug with css color lowering and "var()" * avoid "var()" issues with other css minifications * publish 0.12.15 to npm * update the compat table * allow out-of-range tagged template unicode escapes * fix evanw#1426: remove warning about bad CSS "@" rules * fix evanw#1470: allow "ES2021" in "tsconfig.json" * fix evanw#1462: avoid worker_threads in node <v12.17.0 * fix evanw#1466: paths with "node:" prefix are external * Consider `\` and `/` to be the same in file paths (evanw#1472) * publish 0.12.16 to npm * fix evanw#1455: bundler hoisting bug with var+for loops * fix evanw#1418: private fields and logical assignment * Abort esbuild if stdin is closed when serving (evanw#1449) * release notes for evanw#1449 * fix evanw#1424: always generate private method names * publish 0.12.17 to npm * fix evanw#1483: UTF-8 and utf-8 are the same @charset * improve error about missing sub-condition (evanw#1484) * refactor(deno): use denoflate instead of compress (evanw#1482) deno.land/x/denoflate is about 10% smaller, and a lot more polished and up to date than deno.land/x/compress. * fix evanw#1493: nullish coalescing assignment edge case * fix evanw#1489: do not warn about "es3" in node_modules * fix evanw#1497: "this" before "super()" when minifying * avoid shadowing "expr" in "lowerClass" * fix evanw#1498: variable shadowing broke class lowering * fix: CSS import relative paths (evanw#1494) * add release notes for evanw#1494 * publish 0.12.18 to npm * move source map code to source map module * css: add location info to rules * css: printer returns result object * move span object to logger * css: add support for source maps * add extension to source map tests * add a basic css source map test * fix evanw#519: release notes for css source maps * fix evanw#1507: wrong ts class field side effect order * publish 0.12.19 to npm * avoid printing "</style" in CSS code (evanw#1509) * attempt to fix flaky test * update browser compat data * fix evanw#1512: asi issue with "." and type parameters * fix evanw#1509: make `</script` escape case-insensitive * publish 0.12.20 to npm * update to go version 1.17.0 * fix evanw#995: windows arm64 support * run go format from go 1.17.0 * css: terminate source map comment before "*/" * add windows 64-bit arm build to installer (evanw#995) * publish 0.12.21 to npm * fix evanw#1536: http range requests now use less memory * fix evanw#1538: minify bug for "var()" and "box-shadow" * publish 0.12.22 to npm * fix evanw#1553: rest bindings in TypeScript arrow types * fix evanw#1545: "watch" is not allowed with "buildSync" * fix evanw#1552: keep names + minify + nested functions * forbid "watch" w/ "buildSync" w/o "worker_threads" * publish 0.12.23 to npm * fix direct "eval" variable renaming edge case * publish 0.12.24 to npm * fix evanw#1560: bug with "!" after "new" in TypeScript * capture and report parser panics * fix parser panic due to "#a in #b in c" * class static blocks are a parse error * illumos 64-bit support (evanw#1562) * release notes for evanw#1562 * publish 0.12.25 to npm * feat: Optimizing the __require function (evanw#1580) * release notes for evanw#1579 * move "NO_COLOR" handling into the logger itself * add an "analyze metafile" api * add import paths to analysis * add a "verbose" flag to analysis * fix evanw#1568: release notes for "--analyze" * upgrade "golang.org/x/sys" (evanw#1572) * publish 0.12.26 to npm * fix evanw#1594: update manual compat table overrides * replace math.MaxInt usage (evanw#1585) This constant is only available in go >= 1.17, so I've inlined its value so dependents don't have to upgrade their go version. reference implementation: https://cs.opensource.google/go/go/+/refs/tags/go1.17:src/math/const.go;l=38 * fix evanw#1589: server "stop()" waits for active builds * use "math.MaxUint32" not "math.MaxInt" * update go 1.17.0 => go 1.17.1 * publish 0.12.27 to npm * fix evanw#1599: U+30FB and U+FF65 in ES5 vs. ES6+ * fix evanw#1600: "++" and "--" on class private fields * publish 0.12.28 to npm * fix evanw#1614: proxy from "__require" to "require" * fix evanw#1623: ignore class fields marked "abstract" * "typeof identifier" has no side effects * fix "__require" to have no side effects * fix mangle syntax edge case with "==" and "!=" * fix missing return in "IsNumericValue" * add "--analyze" to cli help text * publish 0.12.29 to npm * no side effects for "typeof x != undefined && x" * separate "ignore annotations" from "tree shaking" (evanw#1625) * install using "optionalDependencies" (evanw#1621) * release notes * publish 0.13.0 to npm * fix release gh action to ignore nested headers * fix the "esbuild" package in yarn 2+ * yarn pnp compat: copy binary into the current pkg * publish 0.13.1 to npm * fix evanw#1628: "export {}" with "--tree-shaking=true" * fix cache condition in iswin_wasm (evanw#1630) * publish 0.13.2 to npm * add "preferUnplugged: false" to binary packages This is a yarn-specific "package.json" flag and is being added at the recommendation of the Yarn team. Even though esbuild's binary packages are listed as optional dependencies of the main package, Yarn still installs all of them (even though only one applies to the current platform). And unlike npm, which always installs a given package into a directory on the file system, Yarn can represent a given package either as a zip file or as a directory of files. So ideally as many packages as possible are represented as zip files to minimize wasted space on the file system (since zip files are compressed). One of the heuristics that Yarn uses is to represent a package as a directory if it contains a file ending in ".exe" so unfortunately esbuild's three Windows packages are always stored as directories instead of as zip files, which means they are uncompressed and are larger than necessary. Specifying "preferUnplugged: false" should avoid this. Hopefully someday Yarn won't even install these packages on the file system in the first place to eliminate the wasted space completely. See also: * https://yarnpkg.com/configuration/manifest/#preferUnplugged * yarnpkg/berry#3317 (comment) * support type-only import/export specifiers (evanw#1637) * publish 0.13.3 to npm * fix evanw#1642: permission issues with install script * basic support for ".mts" and ".cts" from TS 4.5 * fix evanw#1647: add a fallback for "npm --no-optional" * make pnpapi workaround platform-specific (evanw#1656) I'm not sure if this will fix anything, but it probably couldn't hurt. * no optimizations with yarn 1 just in case (evanw#1656) * fix evanw#1657: invalid css transform of margin/padding * remove ".mts" and ".cts" from resolve extensions * publish 0.13.4 to npm * fix evanw#1113: improve watch mode accuracy (evanw#1676) * disallow certain "<" in ".mts/.cts" files * fix evanw#1665: don’t remove empty @Keyframes (evanw#1669) * release notes for evanw#1665 * Don't emit "duplicate label" error across function scopes. (evanw#1671) * release notes for evanw#1671 * publish 0.13.5 to npm * Add NetBSD amd64 binary (evanw#1624) * https in changelog, rebalance makefile * Allow bundled esbuild with ESBUILD_BINARY_PATH (evanw#1678) * feat: drop catch binding when optional catch binding is supported (evanw#1660) * fix subtle minify issues with eval * ts: forbid "declare" fields from being initialized * ts: forbid "declare" on non-field class properties * fix evanw#1675: run decorators for "declare" fields * avoid direct eval retaining unused imports in ts * publish 0.13.6 to npm * update parcel 2 version in benchmark * remove now-unnecessary "@parcel/transformer-typescript-tsc" * remove old bundler versions * update rollup and webpack too * update benchmark image * fix evanw#1682: always use the shortest css alpha value * fix evanw#1680: match node's core module behavior * update go 1.17.1 => 1.17.2 * fix wasm on go 1.17.2 (evanw#1684) * update rollup tests so they work on node v16.11.1 * publish 0.13.7 to npm * fix evanw#1425: super inside arrow inside lowered async * add "and CSS" to package description * fix evanw#1661: remove implicit trailing "/" in "[dir]" * add a test for evanw#1362 * publish 0.13.8 to npm * fix evanw#1702: invalid css transform of border-radius * make yaml formatting consistent * add simple end-to-end tests * fix evanw#1703: handle silent "rename" syscall failure * add pnpm end-to-end tests * check end-to-end test output * resolver: rename "pe" => "pj" * remove unused range * fix evanw#1691: support "imports" in "package.json" * publish 0.13.9 to npm * yarn berry end-to-end test * try running end-to-end tests on github * check that esbuild builds on go 1.13 * Use `io.SeekStart` instead of deprecated `os.SEEK_SET` (evanw#1701) `os.SEEK_SET` has been deprecated since Go 1.7. Ref: https://pkg.go.dev/os#pkg-constants * add "check out code" to old go version ci * update @next targets for npm and yarn * link from code to docs for vs code autocomplete * remove invalid "es7" option in tsconfig parser * update the compat table * Allow target for ES-Version to be uppercase (evanw#1718) * fix evanw#1539: implement legal comments for css * update to unicode 14 * add ".mts" and ".cts" to exports kind checking * publish 0.13.10 to npm * reorder some functions * get tests working on node 17+ * also run async transform tests un-transformed * run tests w/ node 16 not 14 to avoid hard-crash Node 14 has some bug that results in an "unreachable code" panic. For the record, the traceback is as follows: 1: node::NodePlatform::GetStackTracePrinter()::$_3::__invoke() 2: V8_Fatal(char const*, ...) 3: v8::internal::interpreter::BytecodeGenerator::VisitCompoundAssignment(v8::internal::CompoundAssignment*) 4: v8::internal::interpreter::BytecodeGenerator::VisitNoStackOverflowCheck(v8::internal::AstNode*) 5: v8::internal::interpreter::BytecodeGenerator::GenerateBytecodeBody() 6: v8::internal::interpreter::BytecodeGenerator::GenerateBytecode(unsigned long) 7: v8::internal::interpreter::InterpreterCompilationJob::ExecuteJobImpl() 8: v8::internal::(anonymous namespace)::ExecuteSingleUnoptimizedCompilationJob(v8::internal::ParseInfo*, v8::internal::FunctionLiteral*, v8::internal::AccountingAllocator*, std::__1::vector<v8::internal::FunctionLiteral*, std::__1::allocator<v8::internal::FunctionLiteral*> >*) 9: v8::internal::(anonymous namespace)::IterativelyExecuteAndFinalizeUnoptimizedCompilationJobs(v8::internal::Isolate*, v8::internal::Handle<v8::internal::SharedFunctionInfo>, v8::internal::Handle<v8::internal::Script>, v8::internal::ParseInfo*, v8::internal::AccountingAllocator*, v8::internal::IsCompiledScope*, std::__1::vector<v8::internal::FinalizeUnoptimizedCompilationData, std::__1::allocator<v8::internal::FinalizeUnoptimizedCompilationData> >*) 10: v8::internal::Compiler::Compile(v8::internal::Handle<v8::internal::SharedFunctionInfo>, v8::internal::Compiler::ClearExceptionFlag, v8::internal::IsCompiledScope*) 11: v8::internal::Compiler::Compile(v8::internal::Handle<v8::internal::JSFunction>, v8::internal::Compiler::ClearExceptionFlag, v8::internal::IsCompiledScope*) 12: v8::internal::Runtime_CompileLazy(int, unsigned long*, v8::internal::Isolate*) 13: Builtins_CEntry_Return1_DontSaveFPRegs_ArgvOnStack_NoBuiltinExit 14: Builtins_CompileLazy 15: Builtins_InterpreterEntryTrampoline * also run class lowering tests untransformed * test coverage for super and object methods * fix writing to a "super" property * also handle "super" inside static class fields * implement class static blocks (evanw#1729) * publish 0.13.11 to npm * enable tree shaking for empty "static {}" blocks * fix evanw#1730: crash with legal comment and @import * enable tree shaking of "Reflect" static methods * implement "calc()" reduction for css (evanw#1731) * publish 0.13.12 to npm * fix evanw#1739: tree shaking bug with "var exports" * border radius tests: use length instead of number * Add css to help text for --loader (evanw#1744) * allow empty string for CLI string arrays * move "main fields" logic to a separate function * make debug meta available to the entire resolver * say if "main" is missing from main fields (evanw#1754) * fix evanw#1755: merge adjacent selectors with same body * add spack to benchmarks (not ready due to bugs) * Shorten "top", "right" properties into "inset" property (evanw#1758) * add credit to changelog * publish 0.13.13 to npm * chore: make build pass * chore: update publishing scripts Co-authored-by: Evan Wallace <[email protected]> Co-authored-by: dmitrage <[email protected]> Co-authored-by: Liu Bowen <[email protected]> Co-authored-by: Chris Casola <[email protected]> Co-authored-by: Joe Schafer <[email protected]> Co-authored-by: Gusted <[email protected]> Co-authored-by: Weilin Shi <[email protected]> Co-authored-by: José Valim <[email protected]> Co-authored-by: Luca Casonato <[email protected]> Co-authored-by: Rongjian Zhang <[email protected]> Co-authored-by: Dominik Hassler <[email protected]> Co-authored-by: FM <[email protected]> Co-authored-by: David Zukowski <[email protected]> Co-authored-by: John Doe <[email protected]> Co-authored-by: Georges Varouchas <[email protected]> Co-authored-by: Pig Fang <[email protected]> Co-authored-by: Eelco Lempsink <[email protected]> Co-authored-by: Nevkontakte <[email protected]> Co-authored-by: Greg Troxel <[email protected]> Co-authored-by: Piotr Krawiec <[email protected]> Co-authored-by: 翠 / green <[email protected]> Co-authored-by: y-yagi <[email protected]> Co-authored-by: timse <[email protected]> Co-authored-by: Dan Rosén <[email protected]> Co-authored-by: Netlify Team Account 1 <[email protected]>
Jarred-Sumner
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Jun 4, 2024
Loosely based on evanw/esbuild#1385
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This change will shave some bytes when the code is using
Infinity. The ECMA definition of divide can return (-)Infinity based of the second value, specifically when it's zero. And based on the first value it will be positive or negative. See: https://tc39.es/ecma262/#sec-numeric-types-number-divideIt's a small change and shouldn't break any code, as any existing code should play along nice with these values.
Simplified
Hereby ** has priority over the
/and could break the code, but now what's nice about1and0they won't change at all*, doesn't matter which expressions you try to use with which numbers.1could be set to 0 withBut in both cases they should NaN and thus a non-issue.
Regards,
Gusted