Object semantics

javascript.object-semantics

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

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Source

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// Test source pending.

Definition

Property descriptors, receiver checks, language-array identity and expected exception names remain exact observations.

Find it in the repository

Collector source: core/signals/javascript/object-semantics.ts
Export: measurementModule · Signal object
Field definitions: core/definitions/javascript/object-semantics.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.object-semantics
Collector: javascript.object-semantics
API / surface: core/signals/javascript/object-semantics.ts
Timeout: 250 ms
Companion signals: None
Fixture inputs: Declared requests (listed below)

Exact request inputs

[
  {
    "key": "javascript.object-semantics.exceptions",
    "inputs": {
      "circular-json": {
        "operation": "JSON.stringify(cycle)"
      },
      "invalid-precision": {
        "operation": "Number.toFixed",
        "fractionDigits": 101
      }
    },
    "controls": {}
  },
  {
    "key": "javascript.object-semantics.descriptors",
    "inputs": {
      "descriptor-intl-format": {
        "target": "intl",
        "key": "format",
        "maxPrototypeLevels": 8
      },
      "descriptor-intl-resolvedOptions": {
        "target": "intl",
        "key": "resolvedOptions",
        "maxPrototypeLevels": 8
      },
      "descriptor-mimeTypes-item": {
        "target": "mimeTypes",
        "key": "item",
        "maxPrototypeLevels": 8
      },
      "descriptor-mimeTypes-length": {
        "target": "mimeTypes",
        "key": "length",
        "maxPrototypeLevels": 8
      },
      "descriptor-mimeTypes-namedItem": {
        "target": "mimeTypes",
        "key": "namedItem",
        "maxPrototypeLevels": 8
      },
      "descriptor-navigator-hardwareConcurrency": {
        "target": "navigator",
        "key": "hardwareConcurrency",
        "maxPrototypeLevels": 8
      },
      "descriptor-navigator-language": {
        "target": "navigator",
        "key": "language",
        "maxPrototypeLevels": 8
      },
      "descriptor-navigator-languages": {
        "target": "navigator",
        "key": "languages",
        "maxPrototypeLevels": 8
      },
      "descriptor-navigator-mimeTypes": {
        "target": "navigator",
        "key": "mimeTypes",
        "maxPrototypeLevels": 8
      },
      "descriptor-navigator-plugins": {
        "target": "navigator",
        "key": "plugins",
        "maxPrototypeLevels": 8
      },
      "descriptor-plugins-item": {
        "target": "plugins",
        "key": "item",
        "maxPrototypeLevels": 8
      },
      "descriptor-plugins-length": {
        "target": "plugins",
        "key": "length",
        "maxPrototypeLevels": 8
      },
      "descriptor-plugins-namedItem": {
        "target": "plugins",
        "key": "namedItem",
        "maxPrototypeLevels": 8
      },
      "descriptor-screen-height": {
        "target": "screen",
        "key": "height",
        "maxPrototypeLevels": 8
      },
      "descriptor-screen-width": {
        "target": "screen",
        "key": "width",
        "maxPrototypeLevels": 8
      }
    },
    "controls": {}
  },
  {
    "key": "javascript.object-semantics.receivers",
    "inputs": {
      "receiver-language": {
        "receiver": "plain object",
        "key": "language"
      },
      "receiver-languages": {
        "receiver": "plain object",
        "key": "languages"
      },
      "receiver-plugin-item": {
        "receiver": "plain object",
        "key": "item"
      },
      "receiver-plugin-namedItem": {
        "receiver": "plain object",
        "key": "namedItem"
      },
      "receiver-plugins": {
        "receiver": "plain object",
        "key": "plugins"
      }
    },
    "controls": {}
  },
  {
    "key": "javascript.object-semantics.array",
    "inputs": {
      "languages-array": null
    },
    "controls": {}
  }
]

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.object-semantics. 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/object-semantics"

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