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registry: describe an Alexa interface as data

Browse source 
src/registry/ holds what the library knows about an interface: namespace, version, the page it was read from,
properties with their value schemas and directives with their payload schemas. Five interfaces are described
(Alexa, PowerController, BrightnessController, TemperatureSensor, EndpointHealth); the other 65 names of
AlexaInterfaceType are stubs with the version and property names of 1.5.2. schema.ts is the run-time check behind
it (241 lines, no new dependency), catalog.ts the vocabularies of the pages: 103 assets (23 units), 6 actions,
9 states, 56 display categories, 22 reserved words, 73 error types under 11 namespaces.

AlexaInterface.getVersion() and getProps() read the registry; the two switch statements are gone (-167 lines).
On the wire: Alexa.EndpointHealth is announced at 3.1 (was 3.3; the page is titled 3.1 and no page mentions 3.3),
and TimeHoldController and Camera.LiveViewController at 3 and 1.7 (1.5.2 sent the string "UNKNOWN").
DisplayCategory gains VACUUM. New exports: registry, DeclarationError, SchemaError, Assets, Units, Actions,
States, DisplayCategories and the descriptor types.

Tests: 20 JSON examples of the five pages under test/fixtures/alexa-docs; every directive payload and property
value in them parses with its descriptor. npm test: 57 pass (was 30) in 10.8 s, also on Node 18.20.8 and 20.20.2.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
This commit is contained in:
David 2026-09-28 15:18:22 +00:00
parent 128ca35c2a
commit aa0ffd64ea
93 changed files with 4058 additions and 490 deletions
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22
test/fixtures/alexa-docs/alexa-brightnesscontroller/AdjustBrightness.directive.json vendored Normal file
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{
"directive": {
"header": {
"namespace": "Alexa.BrightnessController",
"name": "AdjustBrightness",
"messageId": "Unique version 4 UUID",
"correlationToken": "Opaque correlation token",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "OAuth2.0 bearer token"
},
"endpointId": "Endpoint ID",
"cookie": {}
},
"payload": {
"brightnessDelta": -25
}
}
}

30
test/fixtures/alexa-docs/alexa-brightnesscontroller/AdjustBrightness.response.json vendored Normal file
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{
"event": {
"header": {
"namespace": "Alexa",
"name": "Response",
"messageId": "Unique identifier, preferably a version 4 UUID",
"correlationToken": "Opaque correlation token that matches the request",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "OAuth2.0 bearer token"
},
"endpointId": "Endpoint ID"
},
"payload": {}
},
"context": {
"properties": [
{
"namespace": "Alexa.BrightnessController",
"name": "brightness",
"value": 75,
"timeOfSample": "2017-02-03T16:20:50.52Z",
"uncertaintyInMilliseconds": 1000
}
]
}
}

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test/fixtures/alexa-docs/alexa-brightnesscontroller/ChangeReport.json vendored Normal file
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{
"event": {
"header": {
"namespace": "Alexa",
"name": "ChangeReport",
"messageId": "Unique identifier, preferably a version 4 UUID",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "OAuth2.0 bearer token"
},
"endpointId": "Endpoint ID"
},
"payload": {
"change": {
"cause": {
"type": "PHYSICAL_INTERACTION"
},
"properties": [
{
"namespace": "Alexa.BrightnessController",
"name": "brightness",
"value": 75,
"timeOfSample": "2024-02-03T16:17:00.00Z",
"uncertaintyInMilliseconds": 0
}
]
}
}
},
"context": {
"namespace": "Alexa.EndpointHealth",
"name": "connectivity",
"value": {
"value": "OK"
},
"timeOfSample": "2024-02-03T16:15:00.00Z",
"uncertaintyInMilliseconds": 0
}
}

22
test/fixtures/alexa-docs/alexa-brightnesscontroller/SetBrightness.directive.json vendored Normal file
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{
"directive": {
"header": {
"namespace": "Alexa.BrightnessController",
"name": "SetBrightness",
"messageId": "Unique version 4 UUID",
"correlationToken": "Opaque correlation token",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "OAuth2.0 bearer token"
},
"endpointId": "Endpoint ID",
"cookie": {}
},
"payload": {
"brightness": 50
}
}
}

30
test/fixtures/alexa-docs/alexa-brightnesscontroller/SetBrightness.response.json vendored Normal file
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{
"event": {
"header": {
"namespace": "Alexa",
"name": "Response",
"messageId": "Unique identifier, preferably a version 4 UUID",
"correlationToken": "Opaque correlation token that matches the request",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "OAuth2.0 bearer token"
},
"endpointId": "Endpoint ID"
},
"payload": {}
},
"context": {
"properties": [
{
"namespace": "Alexa.BrightnessController",
"name": "brightness",
"value": 50,
"timeOfSample": "2017-02-03T16:20:50.52Z",
"uncertaintyInMilliseconds": 500
}
]
}
}

30
test/fixtures/alexa-docs/alexa-brightnesscontroller/StateReport.json vendored Normal file
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{
"event": {
"header": {
"namespace": "Alexa",
"name": "StateReport",
"messageId": "Unique identifier, preferably a version 4 UUID",
"correlationToken": "Opaque correlation token that matches the request",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "OAuth2.0 bearer token"
},
"endpointId": "Endpoint ID"
},
"payload": {}
},
"context": {
"properties": [
{
"namespace": "Alexa.BrightnessController",
"name": "brightness",
"value": 75,
"timeOfSample": "2017-02-03T16:20:50.52Z",
"uncertaintyInMilliseconds": 1000
}
]
}
}

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test/fixtures/alexa-docs/alexa-brightnesscontroller/discovery.json vendored Normal file
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{
"event": {
"header": {
"namespace": "Alexa.Discovery",
"name": "Discover.Response",
"payloadVersion": "3",
"messageId": "Unique identifier, preferably a version 4 UUID"
},
"payload": {
"endpoints": [
{
"endpointId": "Unique ID of the endpoint",
"manufacturerName": "Manufacturer of the endpoint",
"description": "Description to be shown in the Alexa app",
"friendlyName": "Living Room Light",
"displayCategories": [
"LIGHT"
],
"additionalAttributes": {
"manufacturer": "Manufacturer of the endpoint",
"model": "Model of the device",
"serialNumber": "Serial number of the device",
"firmwareVersion": "Firmware version of the device",
"softwareVersion": "Software version of the device",
"customIdentifier": "Optional custom identifier for the device"
},
"cookie": {},
"capabilities": [
{
"type": "AlexaInterface",
"interface": "Alexa.BrightnessController",
"version": "3",
"properties": {
"supported": [
{
"name": "brightness"
}
],
"proactivelyReported": true,
"retrievable": true
}
},
{
"type": "AlexaInterface",
"interface": "Alexa.ColorController",
"version": "3",
"properties": {
"supported": [
{
"name": "color"
}
],
"proactivelyReported": true,
"retrievable": true
}
},
{
"type": "AlexaInterface",
"interface": "Alexa.EndpointHealth",
"version": "3",
"properties": {
"supported": [
{
"name": "connectivity"
}
],
"proactivelyReported": true,
"retrievable": true
}
},
{
"type": "AlexaInterface",
"interface": "Alexa",
"version": "3"
}
]
}
]
}
}
}

7
test/fixtures/alexa-docs/alexa-endpointhealth/connectivity.property.json vendored Normal file
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{
"name": "connectivity",
"value": {
"value": "UNREACHABLE",
"reason": "WIFI_BAD_PASSWORD"
}
}

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test/fixtures/alexa-docs/alexa-endpointhealth/discovery.json vendored Normal file
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{
"event": {
"header": {
"namespace": "Alexa.Discovery",
"name": "Discover.Response",
"payloadVersion": "3",
"messageId": "Unique identifier, preferably a version 4 UUID"
},
"payload": {
"endpoints": [
{
"endpointId": "Unique ID of the endpoint",
"manufacturerName": "Sample Manufacturer",
"description": "Description to be shown in the Alexa app",
"friendlyName": "Your device name, displayed in the Alexa app, for example Front Door>",
"displayCategories": [
"SMARTLOCK"
],
"additionalAttributes": {
"manufacturer": "Sample Manufacturer",
"model": "Sample Model",
"serialNumber": "Serial number of the device",
"firmwareVersion": "Firmware version of the device",
"softwareVersion": "Software version of the device",
"customIdentifier": "Optional custom identifier for the device"
},
"cookie": {},
"capabilities": [
{
"type": "AlexaInterface",
"interface": "Alexa.LockController",
"version": "3",
"properties": {
"supported": [
{
"name": "lockState"
}
],
"proactivelyReported": true,
"retrievable": true
}
},
{
"type": "AlexaInterface",
"interface": "Alexa.EndpointHealth",
"version": "3.1",
"properties": {
"supported": [
{
"name": "connectivity"
}
],
"proactivelyReported": true,
"retrievable": true
}
},
{
"type": "AlexaInterface",
"interface": "Alexa",
"version": "3"
}
]
}
]
}
}
}

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test/fixtures/alexa-docs/alexa-interface/discovery.json vendored Normal file
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{
"event": {
"header": {
"namespace": "Alexa.Discovery",
"name": "Discover.Response",
"payloadVersion": "3",
"messageId": "Unique identifier, preferably a version 4 UUID"
},
"payload": {
"endpoints": [
{
"endpointId": "Unique ID of the endpoint",
"manufacturerName": "Manufacturer of the endpoint",
"description": "Description to be shown in the Alexa app",
"friendlyName": "Device name, displayed in the Alexa app",
"displayCategories": [
"LIGHT"
],
"cookie": {},
"capabilities": [
{
"type": "AlexaInterface",
"interface": "Alexa.PowerController",
"version": "3",
"properties": {
"supported": [
{
"name": "powerState"
}
],
"proactivelyReported": true,
"retrievable": true
}
},
{
"type": "AlexaInterface",
"interface": "Alexa",
"version": "3"
}
]
}
]
}
}
}

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test/fixtures/alexa-docs/alexa-powercontroller/ChangeReport.json vendored Normal file
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{
"event": {
"header": {
"namespace": "Alexa",
"name": "ChangeReport",
"messageId": "Unique identifier, preferably a version 4 UUID",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "OAuth2.0 bearer token"
},
"endpointId": "Endpoint ID"
},
"payload": {
"change": {
"cause": {
"type": "PHYSICAL_INTERACTION"
},
"properties": [
{
"namespace": "Alexa.PowerController",
"name": "powerState",
"value": "ON",
"timeOfSample": "2024-05-01T09:32:05.05Z",
"uncertaintyInMilliseconds": 0
}
]
}
}
},
"context": {
"namespace": "Alexa.EndpointHealth",
"name": "connectivity",
"value": {
"value": "OK"
},
"timeOfSample": "2024-05-01T09:31:00.00Z",
"uncertaintyInMilliseconds": 0
}
}

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test/fixtures/alexa-docs/alexa-powercontroller/StateReport.json vendored Normal file
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{
"event": {
"header": {
"namespace": "Alexa",
"name": "StateReport",
"messageId": "Unique identifier, preferably a version 4 UUID",
"correlationToken": "Opaque correlation token that matches the request",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "OAuth2.0 bearer token"
},
"endpointId": "Endpoint ID"
},
"payload": {}
},
"context": {
"properties": [
{
"namespace": "Alexa.PowerController",
"name": "powerState",
"value": "OFF",
"timeOfSample": "2017-02-03T16:20:50.52Z",
"uncertaintyInMilliseconds": 0
}
]
}
}

20
test/fixtures/alexa-docs/alexa-powercontroller/TurnOff.directive.json vendored Normal file
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{
"directive": {
"header": {
"namespace": "Alexa.PowerController",
"name": "TurnOff",
"messageId": "Unique version 4 UUID",
"correlationToken": "Opaque correlation token",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "OAuth2.0 bearer token"
},
"endpointId": "Endpoint ID",
"cookie": {}
},
"payload": {}
}
}

30
test/fixtures/alexa-docs/alexa-powercontroller/TurnOff.response.json vendored Normal file
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{
"event": {
"header": {
"namespace": "Alexa",
"name": "Response",
"messageId": "Unique identifier, preferably a version 4 UUID",
"correlationToken": "Opaque correlation token that matches the request",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "OAuth2.0 bearer token"
},
"endpointId": "Endpoint ID"
},
"payload": {}
},
"context": {
"properties": [
{
"namespace": "Alexa.PowerController",
"name": "powerState",
"value": "OFF",
"timeOfSample": "2017-02-03T16:20:50.52Z",
"uncertaintyInMilliseconds": 500
}
]
}
}

20
test/fixtures/alexa-docs/alexa-powercontroller/TurnOn.directive.json vendored Normal file
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{
"directive": {
"header": {
"namespace": "Alexa.PowerController",
"name": "TurnOn",
"messageId": "Unique version 4 UUID",
"correlationToken": "Opaque correlation token",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "OAuth2.0 bearer token"
},
"endpointId": "Endpoint ID",
"cookie": {}
},
"payload": {}
}
}

30
test/fixtures/alexa-docs/alexa-powercontroller/TurnOn.response.json vendored Normal file
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{
"event": {
"header": {
"namespace": "Alexa",
"name": "Response",
"messageId": "Unique identifier, preferably a version 4 UUID",
"correlationToken": "Opaque correlation token that matches the request",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "OAuth2.0 bearer token"
},
"endpointId": "Endpoint ID"
},
"payload": {}
},
"context": {
"properties": [
{
"namespace": "Alexa.PowerController",
"name": "powerState",
"value": "ON",
"timeOfSample": "2017-02-03T16:20:50.52Z",
"uncertaintyInMilliseconds": 500
}
]
}
}

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test/fixtures/alexa-docs/alexa-powercontroller/discovery.json vendored Normal file
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{
"event": {
"header": {
"namespace": "Alexa.Discovery",
"name": "Discover.Response",
"payloadVersion": "3",
"messageId": "Unique identifier, preferably a version 4 UUID"
},
"payload": {
"endpoints": [
{
"endpointId": "Unique ID of the endpoint",
"manufacturerName": "Manufacturer of the endpoint",
"description": "Description to be shown in the Alexa app",
"friendlyName": "Living Room Light",
"displayCategories": [
"LIGHT"
],
"additionalAttributes": {
"manufacturer": "Manufacturer of the endpoint",
"model": "Model of the device",
"serialNumber": "Serial number of the device",
"firmwareVersion": "Firmware version of the device",
"softwareVersion": "Software version of the device",
"customIdentifier": "Optional custom identifier for the device"
},
"cookie": {},
"capabilities": [
{
"type": "AlexaInterface",
"interface": "Alexa.PowerController",
"version": "3",
"properties": {
"supported": [
{
"name": "powerState"
}
],
"proactivelyReported": true,
"retrievable": true
}
},
{
"type": "AlexaInterface",
"interface": "Alexa.BrightnessController",
"version": "3",
"properties": {
"supported": [
{
"name": "brightness"
}
],
"proactivelyReported": true,
"retrievable": true
}
},
{
"type": "AlexaInterface",
"interface": "Alexa.EndpointHealth",
"version": "3",
"properties": {
"supported": [
{
"name": "connectivity"
}
],
"proactivelyReported": true,
"retrievable": true
}
},
{
"type": "AlexaInterface",
"interface": "Alexa",
"version": "3"
}
]
}
]
}
}
}

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test/fixtures/alexa-docs/alexa-temperaturesensor/ChangeReport.json vendored Normal file
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{
"event": {
"header": {
"namespace": "Alexa",
"name": "ChangeReport",
"messageId": "Unique identifier, preferably a version 4 UUID",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "OAuth2.0 bearer token"
},
"endpointId": "Endpoint ID"
},
"payload": {
"change": {
"cause": {
"type": "PHYSICAL_INTERACTION"
},
"properties": [
{
"namespace": "Alexa.ThermostatController",
"name": "targetSetpoint",
"value": {
"value": 18,
"scale": "CELSIUS"
},
"timeOfSample": "2017-02-03T16:20:50.52Z",
"uncertaintyInMilliseconds": 500
}
]
}
}
},
"context": {
"properties": [
{
"namespace": "Alexa.TemperatureSensor",
"name": "temperature",
"value": {
"value": 19.1,
"scale": "CELSIUS"
},
"timeOfSample": "2017-02-03T16:20:50.52Z",
"uncertaintyInMilliseconds": 1000
},
{
"namespace": "Alexa.ThermostatController",
"name": "thermostatMode",
"value": "COOL",
"timeOfSample": "2017-02-03T16:20:50.52Z",
"uncertaintyInMilliseconds": 500
},
{
"namespace": "Alexa.EndpointHealth",
"name": "connectivity",
"value": {
"value": "OK"
},
"timeOfSample": "2017-02-03T16:20:50.52Z",
"uncertaintyInMilliseconds": 0
}
]
}
}

59
test/fixtures/alexa-docs/alexa-temperaturesensor/StateReport.json vendored Normal file
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{
"event": {
"header": {
"namespace": "Alexa",
"name": "StateReport",
"messageId": "Unique identifier, preferably a version 4 UUID",
"correlationToken": "Opaque correlation token that matches the request",
"payloadVersion": "3"
},
"endpoint": {
"scope": {
"type": "BearerToken",
"token": "OAuth2.0 bearer token"
},
"endpointId": "Endpoint ID"
},
"payload": {}
},
"context": {
"properties": [
{
"namespace": "Alexa.TemperatureSensor",
"name": "temperature",
"value": {
"value": 19.9,
"scale": "CELSIUS"
},
"timeOfSample": "2024-01-06T09:00:00.05Z",
"uncertaintyInMilliseconds": 1000
},
{
"namespace": "Alexa.ThermostatController",
"name": "thermostatMode",
"value": "HEAT",
"timeOfSample": "2024-01-01T08:00:00.05Z",
"uncertaintyInMilliseconds": 500
},
{
"namespace": "Alexa.ThermostatController",
"name": "targetSetpoint",
"value": {
"value": 20,
"scale": "CELSIUS"
},
"timeOfSample": "2024-01-01T08:00:00.05Z",
"uncertaintyInMilliseconds": 500
},
{
"namespace": "Alexa.EndpointHealth",
"name": "connectivity",
"value": {
"value": "OK"
},
"timeOfSample": "2024-01-06T09:00:00.05Z",
"uncertaintyInMilliseconds": 0
}
]
}
}

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test/fixtures/alexa-docs/alexa-temperaturesensor/discovery.json vendored Normal file
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{
"event": {
"header": {
"namespace": "Alexa.Discovery",
"name": "Discover.Response",
"payloadVersion": "3",
"messageId": "Unique identifier, preferably a version 4 UUID"
},
"payload": {
"endpoints": [
{
"endpointId": "Unique ID of the endpoint",
"manufacturerName": "Manufacturer of the endpoint",
"description": "Smart Thermostat by Thermostat Maker",
"friendlyName": "Hallway Thermostat",
"displayCategories": [
"THERMOSTAT",
"TEMPERATURE_SENSOR"
],
"cookie": {},
"capabilities": [
{
"type": "AlexaInterface",
"interface": "Alexa.TemperatureSensor",
"version": "3",
"properties": {
"supported": [
{
"name": "temperature"
}
],
"proactivelyReported": true,
"retrievable": true
}
},
{
"type": "AlexaInterface",
"interface": "Alexa.ThermostatController",
"version": "3.1",
"properties": {
"supported": [
{
"name": "targetSetpoint"
},
{
"name": "lowerSetpoint"
},
{
"name": "upperSetpoint"
},
{
"name": "thermostatMode"
}
],
"proactivelyReported": true,
"retrievable": true
},
"configuration": {
"supportedModes": [
"HEAT",
"COOL",
"AUTO"
],
"supportsScheduling": false
}
},
{
"type": "AlexaInterface",
"interface": "Alexa.EndpointHealth",
"version": "3",
"properties": {
"supported": [
{
"name": "connectivity"
}
],
"proactivelyReported": true,
"retrievable": true
}
},
{
"type": "AlexaInterface",
"interface": "Alexa",
"version": "3"
}
]
}
]
}
}
}

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test/fixtures/interfaces.js vendored Normal file
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"use strict";
// One entry per interface that is described in full: the page its examples were saved from (test/helpers/fixtures.js).
// test/registry/descriptors.test.js holds every entry against those examples and fails for a descriptor of tier 1 or
// 2 that has no entry here.
module.exports = [
{ namespace: "Alexa", page: "alexa-interface" },
{ namespace: "Alexa.BrightnessController", page: "alexa-brightnesscontroller" },
{ namespace: "Alexa.EndpointHealth", page: "alexa-endpointhealth" },
{ namespace: "Alexa.PowerController", page: "alexa-powercontroller" },
{ namespace: "Alexa.TemperatureSensor", page: "alexa-temperaturesensor" },
];

32
test/fixtures/types.ts vendored
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@ -1,8 +1,14 @@
// Compiled, never run (test/typings.test.js, npm run check): a CommonJS TypeScript consumer of the declarations in
// dist/types, resolved through the package's "exports". A "@ts-expect-error" line fails the compile when the
// declaration stops rejecting what follows it.
import { ActionMapping, AlexaActions, AlexaInterfaceType, DisplayCategory, EndpointHealth, PowerController } from "alex2node";
import type { Alex2MQTT, Alex2MQTTOptions, AlexaInterface, AlexaStatusMessage, ChangeCause, Device, SupportedMode } from "alex2node";
import {
ActionMapping, AlexaActions, AlexaInterfaceType, Assets, DeclarationError, DisplayCategory, EndpointHealth, PowerController,
registry,
} from "alex2node";
import type {
Alex2MQTT, Alex2MQTTOptions, AlexaInterface, AlexaStatusMessage, AssetId, ChangeCause, Device, DisplayCategoryName, Infer,
InterfaceDescriptor, Schema, SupportedMode, Temperature, UnitOfMeasure,
} from "alex2node";
declare const bridge: Alex2MQTT;
declare const message: AlexaStatusMessage;
@ -33,4 +39,24 @@ const sent: Promise<string> = device.getChangeReport(cause).addPowerControllerPr
// @ts-expect-error not a cause Alexa knows
device.getChangeReport("BUTTON");
export { options, added, chained, sent };
// The registry: a descriptor by its namespace or by the 1.x enum member
const described: InterfaceDescriptor = registry.get("Alexa.PowerController");
const version: string = registry.get(AlexaInterfaceType.ENDPOINT_HEALTH).version;
const refused: Error = new DeclarationError({ endpointId: "lamp-1", namespace: described.namespace }, "declared twice");
// The vocabularies are unions of what the pages list
const opening: AssetId = Assets[0];
const percent: UnitOfMeasure = "Alexa.Unit.Percent";
const vacuum: DisplayCategoryName = "VACUUM";
// @ts-expect-error not in the global Alexa catalog
const misspelt: AssetId = "Alexa.Setting.Openning";
// @ts-expect-error an asset, but not a unit of measure
const notAUnit: UnitOfMeasure = "Alexa.Setting.Opening";
// A schema types what it parses
declare const temperature: Schema<Temperature>;
const measured: Infer<typeof temperature> = { value: 20, scale: "CELSIUS" };
// @ts-expect-error not a temperature scale
const rankine: Infer<typeof temperature> = { value: 20, scale: "RANKINE" };
export { options, added, chained, sent, version, refused, opening, percent, vacuum, misspelt, notAUnit, measured, rankine };