{ "generatedAt": "2026-11-14T19:21:42.546Z", "experiments": [ { "folder": "001-typed-events", "id": "001", "title": "Typed events: the elegant type that slowed down every call site", "question": "Does a mapped type with an `as` clause, indexed at every call site, make type-checking measurably slower than inferring the event name from a generic parameter?", "opened": "2026-10", "status": "confirmed", "published": "2026-10", "abstract": "Does a mapped type with an `as` clause, indexed at every call site, slow type-checking down compared with inferring the event name from a generic parameter? The same app was checked before and after the change with TypeScript 6 and TypeScript 7, on an Apple M3 Pro and an Intel Xeon, with a safety file of usages that must still fail to compile. On the Apple M3 Pro, check time fell by 52% with TypeScript 6 and by 57% with TypeScript 7, with the same type safety. The main limit: one app written for the experiment, measured with the earlier protocol, without a warm-up run or interleaving.", "keyNumbers": [ { "value": "−52%", "label": "check time with TypeScript 6 after the fix", "metric": "median check time, after vs before", "machine": "Apple M3 Pro" }, { "value": "−57%", "label": "check time with TypeScript 7 after the fix", "metric": "median check time, after vs before", "machine": "Apple M3 Pro" }, { "value": "−65%", "label": "check time with TypeScript 7 after the fix, on one core", "metric": "median check time, after vs before", "machine": "Intel(R) Xeon(R) Processor @ 2.30GHz" } ], "introduction": [ "Typed event emitters are everywhere in TypeScript code: a map from event names to payload types, and an `on` method that looks up the payload for each name. Deriving the names with a mapped type and an `as` clause is concise and reads well, but the checker has to evaluate that type again at every call site that indexes it.", "A cost paid per call site grows with the codebase and is paid on every type-check, locally and in CI. This experiment measures whether that cost is large enough to matter, and whether a simpler pattern removes it without weakening the types." ], "subject": "A small app written for the experiment, with many typed settings and listeners. In `before/`, event names come from a mapped type with an `as` clause, and the tsconfig has no `include`, so a generated file the app never imports is checked too. In `after/`, the event name is inferred from the generic parameter, and `include` is narrowed to `src`. `safety.ts` lists wrong usages that must still fail to compile with the fixed version.", "metrics": [ { "name": "Check time", "definition": "The \"Check time\" line printed by `tsc --extendedDiagnostics`, in seconds: the time spent in the type checker only." }, { "name": "Total time", "definition": "The \"Total time\" line printed by `tsc --extendedDiagnostics`, in seconds: parsing, binding and checking together." }, { "name": "Median", "definition": "The middle value of the measured runs, or the mean of the two middle values for an even count. Every reported figure is a median." }, { "name": "Range", "definition": "The fastest and slowest measured runs, shown as whiskers on the charts." }, { "name": "IQR", "definition": "Interquartile range, Q3 minus Q1, with quartiles by linear interpolation between order statistics." }, { "name": "CV", "definition": "Coefficient of variation: sample standard deviation divided by the mean. Above 5%, the cause is investigated and logged." }, { "name": "Cut", "definition": "One minus the ratio of the median check time after the fix to the median before it. Its range uses the fastest and slowest runs of each side." } ], "discussion": [ "The fix pays off with both compilers. TypeScript 7 does not make the costly pattern harmless: it still evaluates the mapped type at each call site, so the simpler pattern keeps its advantage after a migration.", "On the Apple M3 Pro the ranges of the two cuts overlap (51% to 54% with TypeScript 6, 51% to 65% with TypeScript 7), so this protocol cannot say which compiler gains more there. On the Intel Xeon they do not overlap (38% to 42% and 61% to 67%).", "Lab #002 measures the other lever, the compiler itself, on a real library. The two are independent: a type pattern that is slow to check costs time with either compiler, and fixing it adds to the gain of the migration." ], "recommendations": [ "Look for mapped types with an `as` clause that are indexed at many call sites, and infer the key from a generic parameter instead.", "Keep a safety file of usages that must still fail to compile, so the faster version is proven to be as strict.", "Check that `include` covers only the code the app compiles: here a generated file the app never imports was type-checked on every run." ], "changelog": [], "verdict": "Yes. On an Apple M3 Pro (12 cores), inferring the event name from the generic parameter cut check time by 52% with TypeScript 6 and by 57% with TypeScript 7 (51% to 65% from the fastest and slowest runs); on a 1-core Intel Xeon, by 41% and 65%. The safety check passed on both machines, so the type safety is the same. Narrowing `include` to `src` also stopped TypeScript from reading a generated file the app never imports.", "takeaway": "A mapped type with an `as` clause is evaluated backwards at each indexed call site. If you can infer the key from a generic instead, the checker does far less work.", "reproduce": "npm install && npm run lab:001", "conditions": [ "before-ts6", "after-ts6", "before-ts7", "after-ts7" ], "notes": [ "Both machines use the earlier protocol: 3 runs per condition, no warm-up, runs in sequence. On the Apple M3 Pro, the runs of TypeScript 7 after the fix vary more than the others (0.117 s to 0.159 s, 15.2% coefficient of variation), hence the wider range on that figure.", "The two machines differ by CPU as well as core count: compare the before and after conditions within a machine." ], "updated": "2026-11-09", "sessions": [ { "file": "2026-11-03-linux-1cores.json", "date": "2026-11-03T21:55:43.555Z", "environment": { "cpu": "Intel(R) Xeon(R) Processor @ 2.30GHz", "cores": 1, "memoryGB": 4, "platform": "Linux 6.18.44-fc-v230", "node": "v22.22.2" }, "runsPerCondition": 3, "safetyCheck": "passed", "conditions": [ { "key": "before-ts6", "label": "before (TypeScript 6.0.3)", "compiler": "TypeScript 6.0.3", "scope": "before", "flags": [], "status": "ok", "runs": [ { "files": 65, "types": 38336, "instantiations": 173307, "memoryUsedKB": 179634, "parseTime": 0.68, "bindTime": 0.27, "checkTime": 3.59, "totalTime": 4.58 }, { "files": 65, "types": 38336, "instantiations": 173307, "memoryUsedKB": 182359, "parseTime": 0.68, "bindTime": 0.26, "checkTime": 3.55, "totalTime": 4.53 }, { "files": 65, "types": 38336, "instantiations": 173307, "memoryUsedKB": 180672, "parseTime": 0.62, "bindTime": 0.26, "checkTime": 3.49, "totalTime": 4.41 } ], "median": { "files": 65, "types": 38336, "instantiations": 173307, "memoryUsedKB": 180672, "parseTime": 0.68, "bindTime": 0.26, "checkTime": 3.55, "totalTime": 4.53 } }, { "key": "after-ts6", "label": "after (TypeScript 6.0.3)", "compiler": "TypeScript 6.0.3", "scope": "after", "flags": [], "status": "ok", "runs": [ { "files": 64, "types": 33785, "instantiations": 64166, "memoryUsedKB": 116926, "parseTime": 0.39, "bindTime": 0.17, "checkTime": 2.17, "totalTime": 2.8 }, { "files": 64, "types": 33785, "instantiations": 64166, "memoryUsedKB": 128415, "parseTime": 0.42, "bindTime": 0.18, "checkTime": 2.11, "totalTime": 2.76 }, { "files": 64, "types": 33785, "instantiations": 64166, "memoryUsedKB": 116121, "parseTime": 0.4, "bindTime": 0.18, "checkTime": 2.07, "totalTime": 2.71 } ], "median": { "files": 64, "types": 33785, "instantiations": 64166, "memoryUsedKB": 116926, "parseTime": 0.4, "bindTime": 0.18, "checkTime": 2.11, "totalTime": 2.76 } }, { "key": "before-ts7", "label": "before (TypeScript 7.0.2)", "compiler": "TypeScript 7.0.2", "scope": "before", "flags": [], "status": "ok", "runs": [ { "files": 65, "lines": 65728, "types": 55537, "instantiations": 260791, "memoryUsedKB": 90571, "parseTime": 0.051, "bindTime": 0.032, "checkTime": 0.886, "totalTime": 0.972 }, { "files": 65, "lines": 65728, "types": 55537, "instantiations": 260791, "memoryUsedKB": 90592, "parseTime": 0.052, "bindTime": 0.022, "checkTime": 0.932, "totalTime": 1.011 }, { "files": 65, "lines": 65728, "types": 55537, "instantiations": 260791, "memoryUsedKB": 90347, "parseTime": 0.051, "bindTime": 0.032, "checkTime": 0.927, "totalTime": 1.013 } ], "median": { "files": 65, "lines": 65728, "types": 55537, "instantiations": 260791, "memoryUsedKB": 90571, "parseTime": 0.051, "bindTime": 0.032, "checkTime": 0.927, "totalTime": 1.011 } }, { "key": "after-ts7", "label": "after (TypeScript 7.0.2)", "compiler": "TypeScript 7.0.2", "scope": "after", "flags": [], "status": "ok", "runs": [ { "files": 64, "lines": 58225, "types": 47724, "instantiations": 142952, "memoryUsedKB": 71770, "parseTime": 0.039, "bindTime": 0.019, "checkTime": 0.326, "totalTime": 0.386 }, { "files": 64, "lines": 58225, "types": 47724, "instantiations": 142952, "memoryUsedKB": 71697, "parseTime": 0.042, "bindTime": 0.01, "checkTime": 0.303, "totalTime": 0.358 }, { "files": 64, "lines": 58225, "types": 47724, "instantiations": 142952, "memoryUsedKB": 71770, "parseTime": 0.039, "bindTime": 0.017, "checkTime": 0.344, "totalTime": 0.402 } ], "median": { "files": 64, "lines": 58225, "types": 47724, "instantiations": 142952, "memoryUsedKB": 71770, "parseTime": 0.039, "bindTime": 0.017, "checkTime": 0.326, "totalTime": 0.386 } } ] }, { "file": "2026-11-09-darwin-12cores.json", "date": "2026-11-09T20:10:54.106Z", "environment": { "cpu": "Apple M3 Pro", "cores": 12, "memoryGB": 36, "platform": "Darwin 25.2.0", "node": "v22.23.3" }, "runsPerCondition": 3, "safetyCheck": "passed", "conditions": [ { "key": "before-ts6", "label": "before (TypeScript 6.0.3)", "compiler": "TypeScript 6.0.3", "scope": "before", "flags": [], "status": "ok", "runs": [ { "files": 65, "types": 38336, "instantiations": 173307, "memoryUsedKB": 181940, "parseTime": 0.13, "bindTime": 0.06, "checkTime": 0.91, "totalTime": 1.11, "maxRssMB": 286 }, { "files": 65, "types": 38336, "instantiations": 173307, "memoryUsedKB": 171144, "parseTime": 0.12, "bindTime": 0.07, "checkTime": 0.89, "totalTime": 1.1, "maxRssMB": 279 }, { "files": 65, "types": 38336, "instantiations": 173307, "memoryUsedKB": 174439, "parseTime": 0.12, "bindTime": 0.06, "checkTime": 0.89, "totalTime": 1.09, "maxRssMB": 282 } ], "median": { "files": 65, "types": 38336, "instantiations": 173307, "memoryUsedKB": 174439, "parseTime": 0.12, "bindTime": 0.06, "checkTime": 0.89, "totalTime": 1.1, "maxRssMB": 282 } }, { "key": "after-ts6", "label": "after (TypeScript 6.0.3)", "compiler": "TypeScript 6.0.3", "scope": "after", "flags": [], "status": "ok", "runs": [ { "files": 64, "types": 33785, "instantiations": 64166, "memoryUsedKB": 125730, "parseTime": 0.08, "bindTime": 0.04, "checkTime": 0.43, "totalTime": 0.56, "maxRssMB": 226 }, { "files": 64, "types": 33785, "instantiations": 64166, "memoryUsedKB": 126837, "parseTime": 0.08, "bindTime": 0.04, "checkTime": 0.42, "totalTime": 0.55, "maxRssMB": 225 }, { "files": 64, "types": 33785, "instantiations": 64166, "memoryUsedKB": 128752, "parseTime": 0.08, "bindTime": 0.04, "checkTime": 0.44, "totalTime": 0.58, "maxRssMB": 225 } ], "median": { "files": 64, "types": 33785, "instantiations": 64166, "memoryUsedKB": 126837, "parseTime": 0.08, "bindTime": 0.04, "checkTime": 0.43, "totalTime": 0.56, "maxRssMB": 225 } }, { "key": "before-ts7", "label": "before (TypeScript 7.0.2)", "compiler": "TypeScript 7.0.2", "scope": "before", "flags": [], "status": "ok", "runs": [ { "files": 65, "lines": 65728, "types": 55537, "instantiations": 260791, "memoryUsedKB": 90806, "parseTime": 0.014, "bindTime": 0.004, "checkTime": 0.326, "totalTime": 0.345, "maxRssMB": 203 }, { "files": 65, "lines": 65728, "types": 55537, "instantiations": 260791, "memoryUsedKB": 90815, "parseTime": 0.014, "bindTime": 0.005, "checkTime": 0.33, "totalTime": 0.35, "maxRssMB": 200 }, { "files": 65, "lines": 65728, "types": 55537, "instantiations": 260791, "memoryUsedKB": 90762, "parseTime": 0.014, "bindTime": 0.004, "checkTime": 0.33, "totalTime": 0.349, "maxRssMB": 196 } ], "median": { "files": 65, "lines": 65728, "types": 55537, "instantiations": 260791, "memoryUsedKB": 90806, "parseTime": 0.014, "bindTime": 0.004, "checkTime": 0.33, "totalTime": 0.349, "maxRssMB": 200 } }, { "key": "after-ts7", "label": "after (TypeScript 7.0.2)", "compiler": "TypeScript 7.0.2", "scope": "after", "flags": [], "status": "ok", "runs": [ { "files": 64, "lines": 58225, "types": 47724, "instantiations": 142952, "memoryUsedKB": 71910, "parseTime": 0.013, "bindTime": 0.004, "checkTime": 0.159, "totalTime": 0.177, "maxRssMB": 113 }, { "files": 64, "lines": 58225, "types": 47724, "instantiations": 142952, "memoryUsedKB": 71904, "parseTime": 0.015, "bindTime": 0.006, "checkTime": 0.143, "totalTime": 0.166, "maxRssMB": 110 }, { "files": 64, "lines": 58225, "types": 47724, "instantiations": 142952, "memoryUsedKB": 71940, "parseTime": 0.014, "bindTime": 0.005, "checkTime": 0.117, "totalTime": 0.137, "maxRssMB": 112 } ], "median": { "files": 64, "lines": 58225, "types": 47724, "instantiations": 142952, "memoryUsedKB": 71910, "parseTime": 0.014, "bindTime": 0.005, "checkTime": 0.143, "totalTime": 0.166, "maxRssMB": 112 } } ] } ], "analysis": [ { "machine": { "cpu": "Intel(R) Xeon(R) Processor @ 2.30GHz", "cores": 1, "memoryGB": 4, "platform": "Linux 6.18.44-fc-v230", "node": "v22.22.2" }, "file": "2026-11-03-linux-1cores.json", "safetyCheck": "passed", "cuts": { "ts6": { "value": 0.4056338028169014, "low": 0.37822349570200575, "high": 0.42339832869080785, "before": { "n": 3, "median": 3.55, "min": 3.49, "max": 3.59, "q1": 3.52, "q3": 3.57, "iqr": 0.04999999999999982, "mean": 3.543333333333333, "cv": 0.014204768457705966 }, "after": { "n": 3, "median": 2.11, "min": 2.07, "max": 2.17, "q1": 2.09, "q3": 2.1399999999999997, "iqr": 0.04999999999999982, "mean": 2.1166666666666667, "cv": 0.023779006095340966 } }, "ts7": { "value": 0.6483279395900755, "low": 0.6117381489841986, "high": 0.674892703862661, "before": { "n": 3, "median": 0.927, "min": 0.886, "max": 0.932, "q1": 0.9065000000000001, "q3": 0.9295, "iqr": 0.02299999999999991, "mean": 0.915, "cv": 0.02758345238059885 }, "after": { "n": 3, "median": 0.326, "min": 0.303, "max": 0.344, "q1": 0.3145, "q3": 0.33499999999999996, "iqr": 0.020499999999999963, "mean": 0.3243333333333333, "cv": 0.06336305299814325 } } } }, { "machine": { "cpu": "Apple M3 Pro", "cores": 12, "memoryGB": 36, "platform": "Darwin 25.2.0", "node": "v22.23.3" }, "file": "2026-11-09-darwin-12cores.json", "safetyCheck": "passed", "cuts": { "ts6": { "value": 0.5168539325842697, "low": 0.5056179775280899, "high": 0.5384615384615385, "before": { "n": 3, "median": 0.89, "min": 0.89, "max": 0.91, "q1": 0.89, "q3": 0.9, "iqr": 0.010000000000000009, "mean": 0.8966666666666666, "cv": 0.012877701171515828 }, "after": { "n": 3, "median": 0.43, "min": 0.42, "max": 0.44, "q1": 0.425, "q3": 0.435, "iqr": 0.010000000000000009, "mean": 0.43, "cv": 0.023255813953488393 } }, "ts7": { "value": 0.5666666666666667, "low": 0.5122699386503067, "high": 0.6454545454545455, "before": { "n": 3, "median": 0.33, "min": 0.326, "max": 0.33, "q1": 0.328, "q3": 0.33, "iqr": 0.0020000000000000018, "mean": 0.32866666666666666, "cv": 0.0070265752842550875 }, "after": { "n": 3, "median": 0.143, "min": 0.117, "max": 0.159, "q1": 0.13, "q3": 0.151, "iqr": 0.02099999999999999, "mean": 0.13966666666666666, "cv": 0.15177196272634505 } } } } ] }, { "folder": "002-ts6-vs-ts7-type-fest", "id": "002", "title": "TypeScript 6 vs 7 on type-fest", "question": "How much faster does TypeScript 7 type-check a real, type-heavy library than TypeScript 6, and how much of the gain comes from the native compiler itself rather than parallel checking? What happens to memory on a heavy workload?", "status": "open", "published": "2026-11", "statusReason": "Waiting for a second machine measured with the same protocol.", "abstract": "How much faster does TypeScript 7 type-check a real, type-heavy library than TypeScript 6, how much of the gain comes from the native compiler rather than parallel checking, and what happens to memory? type-fest was checked at a pinned commit with TypeScript 6.0.3 and 7.0.2 on an Apple M3 Pro, with a discarded warm-up per condition and interleaved runs. TypeScript 7 checked the library sources 3.5× faster (2.6× from the native compiler alone, 1.3× from parallel checking) and the full suite with type tests 5.3× faster, while peaking higher in memory (11.6 GiB against 10.4 GiB). The main limit: one library, and only one machine measured with this protocol so far, with other applications open.", "keyNumbers": [ { "value": "3.5×", "label": "faster check of the library sources, TypeScript 7 vs 6", "metric": "ratio of median check times", "machine": "Apple M3 Pro" }, { "value": "2.6×", "label": "faster from the native compiler alone, TypeScript 7 single-threaded vs 6", "metric": "ratio of median check times", "machine": "Apple M3 Pro" }, { "value": "5.3×", "label": "faster on the full suite with type tests", "metric": "ratio of median check times", "machine": "Apple M3 Pro" }, { "value": "11.6 GiB", "compare": "10.4 GiB", "label": "peak memory on the full suite, TypeScript 7 vs TypeScript 6", "metric": "median peak RSS", "machine": "Apple M3 Pro" } ], "introduction": [ "TypeScript 7 is a native port of the compiler. Teams planning the move want to know what it changes for their own checks: how much faster CI gets, whether the gain needs a machine with many cores, and whether memory goes up or down.", "type-fest is a demanding test for those questions: a widely used library made almost entirely of complex types, with a suite of type tests that is much heavier than the library itself. Measuring both workloads separates the everyday case from the stress case." ], "subject": "type-fest at a pinned commit, in two workloads: the library sources only (`index.d.ts` and `source/`), and the full suite including the type tests (`test-d/`). TypeScript 7 is also run with `--singleThreaded`, to separate the native compiler from parallel checking, and with `--checkers` set to several values in a separate series. The full suite is checked with TypeScript 6 twice: with Node.js's default heap, run once to record the error, and with a larger heap.", "metrics": [ { "name": "Check time", "definition": "The \"Check time\" line printed by `tsc --extendedDiagnostics`, in seconds: the time spent in the type checker only." }, { "name": "Total time", "definition": "The \"Total time\" line printed by `tsc --extendedDiagnostics`, in seconds: parsing, binding and checking together." }, { "name": "Median", "definition": "The middle value of the measured runs, or the mean of the two middle values for an even count. Every reported figure is a median." }, { "name": "Range", "definition": "The fastest and slowest measured runs, shown as whiskers on the charts." }, { "name": "IQR", "definition": "Interquartile range, Q3 minus Q1, with quartiles by linear interpolation between order statistics." }, { "name": "CV", "definition": "Coefficient of variation: sample standard deviation divided by the mean. Above 5%, the cause is investigated and logged." }, { "name": "Peak memory", "definition": "Peak resident memory (RSS) from `/usr/bin/time -l`, field \"maximum resident set size\", of the largest process: the Node.js process for TypeScript 6, the native compiler for TypeScript 7." }, { "name": "Gain", "definition": "Ratio of two median check times. The native part compares TypeScript 6 with TypeScript 7 single-threaded; the parallel part compares single-threaded with the default mode. Their product is the total gain." } ], "discussion": [ "Most of the speedup does not depend on cores. TypeScript 7 single-threaded is already 2.6× faster than TypeScript 6, and parallel checking adds 1.3× on top. On the one-core Intel Xeon, measured with the earlier protocol, the native compiler gives 4.0× and parallel checking 1.0×: small CI runners get most of the gain.", "Memory is the surprise. On the full suite TypeScript 7 peaks higher than TypeScript 6 given a 16 GiB heap (11.6 GiB against 10.4 GiB), while TypeScript 7 single-threaded peaks at 9.6 GiB and takes 23 s. Parallel checking trades memory for time. TypeScript 6 cannot finish the full suite at all at Node.js's default heap limit (4.0 GiB).", "The default mode does not use every core: `--checkers 8` checked the sources 22% faster than the default mode, in a separate series.", "Lab #001 measured the other lever: one costly type pattern, fixed, cut check time with TypeScript 7 as well as with TypeScript 6. Migrating does not remove the cost of a slow type, so the two gains add up." ], "recommendations": [ "Expect most of the gain even on small CI runners: it comes from the native compiler, not from the number of cores.", "Before switching a heavy type-test suite, measure its peak memory with TypeScript 7 and size CI runners on it, not on check time alone.", "On machines with many cores, try `--checkers`: the default mode did not use all of them here.", "Measure your own codebase with the same protocol before deciding: one library is not your project." ], "changelog": [ { "date": "2026-11-11", "text": "First published at 4.0×; corrected to 3.5× after adding a warm-up run and interleaving." } ], "verdict": "On an Apple M3 Pro (12 cores), TypeScript 7.0.2 checked the type-fest sources 3.5× faster than TypeScript 6.0.3 (0.484 s vs 1.67 s): 2.6× comes from the native compiler alone (single-threaded) and 1.3× from parallel checking. On the full suite with type tests, TypeScript 6 stops at Node.js's default heap limit (4.0 GiB); with a 16 GiB heap it finishes in 74.6 s, against 14.1 s for TypeScript 7 (5.3× faster), but TypeScript 7 peaks higher in memory (11.6 GiB RSS vs 10.4 GiB). Stays open until a second machine is measured with the same protocol.", "takeaway": "Most of the gain comes from the native compiler, so expect it even on small CI runners. The default mode does not use all available cores: on this 12-core machine, `--checkers 8` checked the sources in 0.377 s, 22% faster than the default mode (0.484 s), and `--checkers 4` took 0.475 s.", "reproduce": "npm install && npm run lab:002", "target": { "name": "type-fest", "repository": "https://github.com/sindresorhus/type-fest", "commit": "2fbae25f05b697c0011d0e2f931d015a77a61ba8" }, "notes": [ "Types and Instantiations differ between TypeScript 6 and 7 on identical code, so never compare these counters across compilers. TypeScript 7's counters also vary slightly from run to run on the full suite, single-threaded included; on the library sources they are identical across runs.", "Memory is peak resident memory (RSS) from `/usr/bin/time -l`, field \"maximum resident set size\", of the largest process: the Node.js process for TypeScript 6, the native compiler for TypeScript 7 (its launcher replaces itself with the native binary). It is not the compiler's own \"Memory used\" line, which for TypeScript 6 is the V8 heap.", "Out of memory means Node.js's default heap limit (4.0 GiB here), not the machine's RAM: TypeScript 6 aborted with \"Reached heap limit\" at 4.2 GiB RSS, and completed with `--max-old-space-size=16384`.", "One library (type-fest at one commit), check time only: no emit, watch mode or editor latency.", "The two machines differ by CPU as well as core count, so compare conditions within a machine; the comparison between machines is indicative only. On the 1-core Intel Xeon, parallel checking gives 1.0× (0.9× to 1.1×) and the native compiler 4.0×.", "The Intel Xeon results use the earlier protocol: 3 runs, no warm-up, not interleaved, no RSS. The Apple M3 Pro results use a discarded warm-up per condition and interleaved runs, with other applications open (load average 3.0 to 5.0). The full-suite runs stay noisy: up to 6.7% coefficient of variation.", "The checker series was measured with other applications open (load average 3.0 to 4.2), and in a separate series from the default mode: the comparison between `--checkers 8` and the default mode crosses two series." ], "conditions": [ "src-ts6", "src-ts7", "src-ts7-single", "full-ts6", "full-ts7" ], "updated": "2026-11-11", "sessions": [ { "file": "2026-11-03-linux-1cores.json", "date": "2026-11-03T21:58:34.893Z", "environment": { "cpu": "Intel(R) Xeon(R) Processor @ 2.30GHz", "cores": 1, "memoryGB": 4, "platform": "Linux 6.18.44-fc-v230", "node": "v22.22.2" }, "runsPerCondition": 3, "target": { "name": "type-fest", "repository": "https://github.com/sindresorhus/type-fest", "commit": "2fbae25f05b697c0011d0e2f931d015a77a61ba8" }, "conditions": [ { "key": "src-ts6", "label": "Sources, TypeScript 6.0.3", "compiler": "TypeScript 6.0.3", "scope": "sources", "flags": [], "status": "ok", "runs": [ { "files": 338, "types": 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