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Add script to get builtin globals (#207)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,3 @@ | ||
| node_modules | ||
| yarn.lock | ||
| .cache |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| import fs from 'node:fs/promises'; | ||
| import * as cheerio from 'cheerio'; | ||
|
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| const SPECIFICATION_URLS = [ | ||
| 'https://raw.githubusercontent.com/tc39/ecma262/HEAD/spec.html', | ||
| 'https://cdn.jsdelivr.net/gh/tc39/ecma262/spec.html', | ||
| ]; | ||
| const CACHE_FILE = new URL('../.cache/spec.html', import.meta.url); | ||
| const DATA_FILE = new URL('../globals.json', import.meta.url); | ||
|
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| const getText = async (url) => { | ||
| const response = await fetch(url); | ||
| const text = await response.text(); | ||
| return text; | ||
| }; | ||
|
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| const any = async (asyncFunctions) => { | ||
| const errors = []; | ||
| for (const function_ of asyncFunctions) { | ||
| try { | ||
| return await function_(); | ||
| } catch (error) { | ||
| errors.push(error); | ||
| } | ||
| } | ||
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| throw new AggregateError(errors, 'All failed.'); | ||
| }; | ||
|
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| const getSpecification = async () => { | ||
| let stat; | ||
|
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| try { | ||
| stat = await fs.stat(CACHE_FILE); | ||
| } catch {} | ||
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| if (stat) { | ||
| if (Date.now() - stat.ctimeMs < /* 10 hours */ 10 * 60 * 60 * 1000) { | ||
| return fs.readFile(CACHE_FILE, 'utf8'); | ||
| } | ||
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| await fs.rm(CACHE_FILE); | ||
| } | ||
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| const text = await any(SPECIFICATION_URLS.map((url) => () => getText(url))); | ||
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| await fs.mkdir(new URL('./', CACHE_FILE), { recursive: true }); | ||
| await fs.writeFile(CACHE_FILE, text); | ||
|
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| return text; | ||
| }; | ||
|
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| function* getGlobalObjects(specification) { | ||
| const $ = cheerio.load(specification); | ||
| for (const element of $('emu-clause#sec-global-object > emu-clause h1')) { | ||
| const property = $(element).text().trim().split(/\s/)[0]; | ||
| const descriptor = Object.getOwnPropertyDescriptor(globalThis, property); | ||
| if (descriptor) { | ||
| yield { property, descriptor }; | ||
| } | ||
| } | ||
|
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| // Annex B | ||
| yield* ['escape', 'unescape'].map((property) => ({ | ||
| property, | ||
| descriptor: Object.getOwnPropertyDescriptor(globalThis, property), | ||
| })); | ||
| } | ||
|
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| function* getObjectProperties(specification) { | ||
| const $ = cheerio.load(specification); | ||
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| for (const element of $('emu-clause#sec-properties-of-the-object-prototype-object > emu-clause > h1')) { | ||
| const text = $(element).text().trim(); | ||
| if (!text.startsWith('Object.prototype.')) { | ||
| continue; | ||
| } | ||
|
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| const property = text.split(/\s/)[0].slice('Object.prototype.'.length); | ||
| // `Object.prototype.{__proto__, ..}` | ||
| if (property.startsWith('_')) { | ||
| continue; | ||
| } | ||
|
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||
| const descriptor = Object.getOwnPropertyDescriptor( | ||
| Object.prototype, | ||
| property | ||
| ); | ||
| if (descriptor) { | ||
| yield { property, descriptor }; | ||
| } | ||
| } | ||
| } | ||
|
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| let specification = await getSpecification(); | ||
| const builtinGlobals = Object.fromEntries( | ||
| [ | ||
| ...getGlobalObjects(specification), | ||
| // `globalThis` is an object | ||
| ...getObjectProperties(specification), | ||
| ] | ||
| .sort(({ property: propertyA }, { property: propertyB }) => | ||
| propertyA.localeCompare(propertyB) | ||
| ) | ||
| .map(({ property }) => [ | ||
| property, | ||
| // Most of these except `Infinity`, `NaN`, `undefined` are actually writable/configurable | ||
| false, | ||
| ]) | ||
| ); | ||
|
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| const globals = JSON.parse(await fs.readFile(DATA_FILE)); | ||
| const originalGlobals = Object.keys(globals.builtin); | ||
| globals.builtin = builtinGlobals; | ||
|
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| await fs.writeFile(DATA_FILE, JSON.stringify(globals, undefined, '\t') + '\n'); | ||
|
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| const added = Object.keys(builtinGlobals).filter( | ||
| (property) => !originalGlobals.includes(property) | ||
| ); | ||
| const removed = originalGlobals.filter( | ||
| (property) => !Object.hasOwn(builtinGlobals) | ||
| ); | ||
|
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||
| console.log(` | ||
| ✅ Builtin globals updated. | ||
| Added(${added.length}): | ||
| ${added.map((property) => ` - ${property}`).join('\n') || 'None'} | ||
| Removed(${removed.length}): | ||
| ${removed.map((property) => ` - ${property}`).join('\n') || 'None'} | ||
| `); |