Enable JS emit for noCheck and noCheck for transpileModule #58364
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typescript-bot
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@typescript-bot perf test this faster |
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@weswigham Here they are:
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weswigham
commented
Apr 30, 2024
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| !!!! File file1.js missing from original emit, but present in noCheck emit | ||
| //// [file1.js] | ||
| export const x = 3; |
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No checker error, so the emit happens. 🤷♂️
| } | ||
| declare var k: c | m.c; | ||
| -declare var l: c | m.c; | ||
| +declare var l: m.c | c; |
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Union order swaps - the EmitResolver during js+.d.ts emit happens to create these types in the reverse order of a full typecheck.
| !!! related TS2304 multiLinePropertyAccessAndArrowFunctionIndent1.ts:1:18: Cannot find name 'role'. | ||
| !!! related TS2304 multiLinePropertyAccessAndArrowFunctionIndent1.ts:2:18: Cannot find name 'Role'. | ||
| !!! related TS2503 multiLinePropertyAccessAndArrowFunctionIndent1.ts:4:26: Cannot find namespace 'ng'. | ||
| !!! related TS2304 multiLinePropertyAccessAndArrowFunctionIndent1.ts:4:53: Cannot find name 'Role'. |
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The top-level return is a grammar error that normally blocks us reporting all these errors. Calculating emit flags for them lazily, however, manifests these errors. Do note: this is also technically a correctness improvement - previously, block scoped bindings and the like inside a top-level return like this wouldn't get transformed according to the target because we'd assume we'd calculated their NodeCheckFlags when in fact we hadn't. Still, these errors are basically silent, even if they're reasonable, hence the warning in the error log. I could probably silence these and get the old behavior back if I really tried, I'm just not sure it's necessary.
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| !!!! File all.d.ts missing from original emit, but present in noCheck emit | ||
| //// [all.d.ts] | ||
| declare module "ref/a" { |
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Now that this isn't emitDeclarationOnly, this configuration of compiler options is forbidden, thus produces no output again. (Even with noCheck)
| @@ -846,7 +846,7 @@ type AnyArr = [...any]; | |||
| declare const tc4: [...string[], number, number, number]; | |||
| declare function concat2<T extends readonly unknown[], U extends readonly unknown[]>(t: T, u: U): (T[number] | U[number])[]; | |||
| -declare const tc5: (2 | 4 | 1 | 3 | 6 | 5)[]; | |||
| +declare const tc5: (1 | 2 | 3 | 6 | 4 | 5)[]; | |||
| +declare const tc5: (3 | 2 | 1 | 6 | 4 | 5)[]; | |||
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This union order shifts again. Presumably the EmitResolver usages in js emit tweak the order we manifest these number types in.
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| !!!! File autoAccessor1.js missing from original emit, but present in noCheck emit | ||
| //// [autoAccessor1.js] | ||
| var __classPrivateFieldGet = (this && this.__classPrivateFieldGet) || function (receiver, state, kind, f) { |
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The target error for auto-accessors, Properties with the 'accessor' modifier are only available when targeting ECMAScript 2015 and higher. is a checker error. So when it's suppressed, we happily do emit.
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weswigham
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May 14, 2024
| "use strict"; | ||
| Object.defineProperty(exports, "__esModule", { value: true }); | ||
| -exports.a = void 0; | ||
| -exports.a = x.c; |
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I think this is a case where the noCheck output is an improvement. As a perf optimization, I made reference marking with an Unspecified hint skip all Ambient nodes - that causes this change. The export declare import statement in this file usually gets transformed into the output js, even though it has a declare modifier. That's likely because the declare modifier on an import is an error, so the alias marking is done unconditionally. In any case, since the input has a syntax/grammar type error, I think it's fine for the output to diverge a bit like this. I could bring it in-line (either by changing normal behavior to elide this, or noCheck to retain it), but I'm not sure it's worth the effort, given the error.
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@typescript-bot perf test this faster I still need to sprinkle around setting the |
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@weswigham Here they are:
tscComparison Report - baseline..pr
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Much better, no more check regressions, only emit ones, and those aughta get fixed with proper application of |
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@typescript-bot perf test this faster |
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@weswigham Here they are:
tscComparison Report - baseline..pr
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@typescript-bot perf test this faster |
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@weswigham Here they are:
tscComparison Report - baseline..pr
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jakebailey
reviewed
May 16, 2024
| @@ -5761,10 +5777,11 @@ export interface EmitResolver { | |||
| isValueAliasDeclaration(node: Node): boolean; | |||
| isReferencedAliasDeclaration(node: Node, checkChildren?: boolean): boolean; | |||
| isTopLevelValueImportEqualsWithEntityName(node: ImportEqualsDeclaration): boolean; | |||
| getNodeCheckFlags(node: Node): NodeCheckFlags; | |||
| hasNodeCheckFlag(node: Node, flags: LazyNodeCheckFlags): boolean; | |||
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All in all, I wonder how many other flag checks could be done like this (I did something similar for another flag which helped perf too)
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For fun @typescript-bot perf test this predictable |
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@jakebailey Here they are:
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@typescript-bot perf test this predictable |
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@jakebailey Here they are:
tscComparison Report - baseline..pr
System info unknown
Hosts
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tsserverComparison Report - baseline..pr
System info unknown
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startupComparison Report - baseline..pr
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The perf results are still seemingly showing a regression in emit time on various projects. Not sure what's going on there but I'll try and profile... |
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I mentioned it in our meeting, but the only things not |
sheetalkamat
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May 21, 2024
…it to be done without type checking
| @@ -924,6 +930,14 @@ export function emitFiles(resolver: EmitResolver, host: EmitHost, targetSourceFi | |||
| forEachChild(node, collectLinkedAliases); | |||
| } | |||
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| function markLinkedReferences(file: SourceFile) { | |||
| ts.forEachChildRecursively(file, n => { | |||
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can this instead check if file doesnt have TypeChecked flag and do this work and then we can get rid of getDiagnostics all together from getEmitResolver()
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Not quite - the TypeChecked flag is, ironically, set on files whose type checking is skipped. Maybe it's a misnomer, but it really just means "Has checkSourceFile been called on this node?". I get your drift though and, yeah, we could probably do a bit of refactoring to use a node flag to track the diagnostic walk state of the containing file. I'll probably put that up as a separate cleanup, though. I also think I want to move around/refactor the API logic for collectLinkedAliases so the API is harder to misuse, and will probably change markLinkedReferences to match, so I'll put all those nonfunctional changes in a separate PR (which should have a 0-test diff).
jakebailey
reviewed
May 23, 2024
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I'm having a pretty hard time figuring out where the slowdown is; the vscode benchmark takes a long time so two runs are just not comparable, even in predictable mode on a perf locked core. @typescript-bot perf test this faster |
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@jakebailey Here they are:
tscComparison Report - baseline..pr
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jakebailey
reviewed
May 24, 2024
| return !!(getNodeCheckFlags(node) & flag); | ||
| } | ||
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| function calculateNodeCheckFlagWorker(node: Node, flag: LazyNodeCheckFlags) { |
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Is there a chance for this to go out of sync with other code that sets these flags?
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100% absolutely, but since we run with noCheck and compare the result to a normal emit for every test we have, it's very likely a test will catch it.
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I also do reuse the actual flag-setting functions, just not the traversal to reach and invoke them. So the "should this flag be set" logic should be synced, at least.
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@typescript-bot pack this |
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Hey @DanielRosenwasser, I've packed this into an installable tgz. You can install it for testing by referencing it in your and then running There is also a playground for this build and an npm module you can use via |
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I thought I'd try this out on a ts-loader project, so tested out pyright's build before and after. Somehow, it's slower? I suppose this doesn't actually use transpileModule since they're using const enums and everything :( $ hyperfine 'node --max_old_space_size=8192 ./node_modules/webpack-cli/bin/cli.js --mode development'
Benchmark 1: node --max_old_space_size=8192 ./node_modules/webpack-cli/bin/cli.js --mode development
Time (mean ± σ): 14.899 s ± 0.221 s [User: 22.878 s, System: 1.591 s]
Range (min … max): 14.379 s … 15.200 s 10 runs
$ hyperfine 'node --max_old_space_size=8192 ./node_modules/webpack-cli/bin/cli.js --mode development'
Benchmark 1: node --max_old_space_size=8192 ./node_modules/webpack-cli/bin/cli.js --mode development
Time (mean ± σ): 15.110 s ± 0.164 s [User: 23.219 s, System: 1.541 s]
Range (min … max): 14.888 s … 15.395 s 10 runs |
Ya, |
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In lieu of real-world benchmarks, I used ts.transpileModule(input, {
fileName,
compilerOptions: { target: ts.ScriptTarget.ESNext, module: ts.ModuleKind.Preserve } },
);So, for files of a non-trivial size, it sure seems like a good 2x speed boost for I have not been able to pin down the perf regression, if there even is one. But I'm pretty sure we should just take this anyhow. |
jakebailey
approved these changes
May 30, 2024
sheetalkamat
approved these changes
May 30, 2024
skeate
added a commit
to skeate/TypeScript
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Jun 1, 2024
* upstream/main: (37 commits) Added NoTruncation flag to completions (microsoft#58719) Clone node to remove location even when it has been modified if needed (microsoft#58706) Properly account for `this` argument in intersection apparent type caching (microsoft#58677) Fix: Include Values of Script Extensions for Unicode Property Value Expressions in Regular Expressions (microsoft#58615) In `reScanSlashToken` use `charCodeChecked` not `codePointChecked` (microsoft#58727) Shorten error spans for errors reported on constructor declarations (microsoft#58061) Mark file as skips typechecking if it contains ts-nocheck (microsoft#58593) Fixed an issue with broken `await using` declarations in `for of` loops (microsoft#56466) Do not expand type references in keyof and index access (microsoft#58715) Improve the performance of isolatedDeclarations quickfix (microsoft#58722) Unwrap `NoInfer` types when narrowing (microsoft#58292) Recover from type reuse errors by falling back to inferred type printing (microsoft#58720) Fixing self import (microsoft#58718) Enable JS emit for noCheck and noCheck for transpileModule (microsoft#58364) Revert PR 55371 (microsoft#58702) Update dependencies (microsoft#58639) Fix baselines after PR 58621 (microsoft#58705) Do not infer `yield*` type from contextual `TReturn` (microsoft#58621) `await using` normative changes (microsoft#58624) Handling statements from a known source file (microsoft#58679) ...
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This PR enables
noCheckfor JS emit, and tests all js emit tests withnoCheck, just as we do declaration emit tests withnoCheck. It also enablesnoCheckfortranspileModuleby default.