94 lines
2.1 KiB
JavaScript
94 lines
2.1 KiB
JavaScript
'use strict'
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/** @typedef {`node:${string}`} NodeModuleName */
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/** @type {Record<NodeModuleName, () => any>} */
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const lazyLoaders = {
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__proto__: null,
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'node:crypto': () => require('node:crypto'),
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'node:sqlite': () => require('node:sqlite')
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}
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/**
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* @param {NodeModuleName} moduleName
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* @returns {boolean}
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*/
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function detectRuntimeFeatureByNodeModule (moduleName) {
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try {
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lazyLoaders[moduleName]()
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return true
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} catch (err) {
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if (err.code !== 'ERR_UNKNOWN_BUILTIN_MODULE' && err.code !== 'ERR_NO_CRYPTO') {
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throw err
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}
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return false
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}
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}
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const runtimeFeaturesAsNodeModule = /** @type {const} */ (['crypto', 'sqlite'])
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/** @typedef {typeof runtimeFeaturesAsNodeModule[number]} RuntimeFeatureByNodeModule */
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/** @typedef {RuntimeFeatureByNodeModule} Feature */
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/**
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* @param {Feature} feature
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* @returns {boolean}
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*/
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function detectRuntimeFeature (feature) {
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if (runtimeFeaturesAsNodeModule.includes(/** @type {RuntimeFeatureByNodeModule} */ (feature))) {
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return detectRuntimeFeatureByNodeModule(`node:${feature}`)
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}
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throw new TypeError(`unknown feature: ${feature}`)
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}
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/**
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* @class
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* @name RuntimeFeatures
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*/
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class RuntimeFeatures {
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/** @type {Map<Feature, boolean>} */
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#map = new Map()
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/**
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* Clears all cached feature detections.
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*/
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clear () {
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this.#map.clear()
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}
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/**
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* @param {Feature} feature
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* @returns {boolean}
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*/
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has (feature) {
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return (
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this.#map.get(feature) ?? this.#detectRuntimeFeature(feature)
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)
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}
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/**
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* @param {Feature} feature
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* @param {boolean} value
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*/
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set (feature, value) {
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if (runtimeFeaturesAsNodeModule.includes(feature) === false) {
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throw new TypeError(`unknown feature: ${feature}`)
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}
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this.#map.set(feature, value)
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}
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/**
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* @param {Feature} feature
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* @returns {boolean}
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*/
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#detectRuntimeFeature (feature) {
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const result = detectRuntimeFeature(feature)
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this.#map.set(feature, result)
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return result
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}
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}
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const instance = new RuntimeFeatures()
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module.exports.runtimeFeatures = instance
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module.exports.default = instance
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