Typed array conversions

javascript.typed-arrays

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Selected signal results for external comparison. Field statuses, controls and exact values are retained.

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// Test source pending.

Definition

Clamping, wrapping and alignment exceptions retain exact small conversion outcomes.

Find it in the repository

Collector source: core/signals/javascript/builtins.ts
Export: measurementModule · Signal object
Field definitions: core/definitions/javascript/typed-arrays.ts
Capture membership: Product capture · common/capture/product.ts
Page registration: app/signals/registry.ts
Field projection: core/results/measurement.ts

Execution contract

Signal: javascript.typed-arrays
Collector: javascript.builtins
API / surface: core/signals/javascript/builtins.ts
Timeout: 500 ms
Companion signals: dom.xmljavascript.intl-controls
Fixture inputs: Declared requests (listed below)

Exact request inputs

[
  {
    "key": "javascript.typed-arrays.uint8-clamp",
    "inputs": {
      "uint8-clamp": [
        {
          "numericClass": "negative-infinity"
        },
        -1,
        {
          "numericClass": "negative-zero"
        },
        0,
        0.5,
        1.5,
        2.5,
        254.5,
        255.5,
        {
          "numericClass": "nan"
        },
        {
          "numericClass": "positive-infinity"
        }
      ]
    },
    "controls": {
      "uint8-clamp": [
        {
          "relationshipId": "E08.to-uint8-clamp",
          "class": "required",
          "preconditions": [
            "ToUint8Clamp tie-to-even"
          ]
        }
      ]
    }
  },
  {
    "key": "javascript.typed-arrays.int32-wrap",
    "inputs": {
      "int32-wrap": [
        2147483648,
        4294967297,
        -1.9,
        {
          "numericClass": "nan"
        }
      ]
    },
    "controls": {
      "int32-wrap": [
        {
          "relationshipId": "E08.to-int32",
          "class": "required",
          "preconditions": [
            "finite truncation and modulo conversion"
          ]
        }
      ]
    }
  },
  {
    "key": "javascript.typed-arrays.typed-array-alignment",
    "inputs": {
      "typed-array-alignment": {
        "byteLength": 3,
        "elementBytes": 4
      }
    },
    "controls": {
      "typed-array-alignment": [
        {
          "relationshipId": "E08.arraybuffer-alignment",
          "class": "required",
          "preconditions": [
            "3-byte ArrayBuffer",
            "Uint32Array without length"
          ]
        }
      ]
    }
  }
]

One collector runs per invocation. Results and JSON select this signal’s fields; any companions execute in the same collector.

Generated source manifest lists runtime files, fixture URLs and content digests for this build. The Source tab provides a copyable console sample.

Run and edit locally

From the repository root, start the Astro app, then open /signals/javascript.typed-arrays. Edit the collector source and reload the page to load its new build.

pnpm run dev:web

In a browser module served by this repository’s Vite graph:

import { createCollector } from "/core/collect"
import { measurementModule } from "/core/signals/javascript/builtins"

const signal = measurementModule
const collector = createCollector()
const suite = { signals: [signal] }
const result = await collector.collect(suite)

Reuse the collector owner for repeated calls so collection can enforce cleanup. This returns the collector’s raw result; app/signals/projection.ts selects the retained fields shown on this page.

rg -n 'measurementModule' core app tests
pnpm run check
pnpm run test tests/unit/app/focused-projection.test.ts