80 lines
2.2 KiB
Plaintext
80 lines
2.2 KiB
Plaintext
import fs from 'fs'
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import path from 'path'
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let jsExtensions = ['.js', '.cjs', '.mjs']
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// Given the current file `a.ts`, we want to make sure that when importing `b` that we resolve
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// `b.ts` before `b.js`
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//
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// E.g.:
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//
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// a.ts
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// b // .ts
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// c // .ts
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// a.js
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// b // .js or .ts
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let jsResolutionOrder = ['', '.js', '.cjs', '.mjs', '.ts', '.cts', '.mts', '.jsx', '.tsx']
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let tsResolutionOrder = ['', '.ts', '.cts', '.mts', '.tsx', '.js', '.cjs', '.mjs', '.jsx']
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function resolveWithExtension(file, extensions) {
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// Try to find `./a.ts`, `./a.ts`, ... from `./a`
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for (let ext of extensions) {
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let full = `${file}${ext}`
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if (fs.existsSync(full) && fs.statSync(full).isFile()) {
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return full
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}
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}
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// Try to find `./a/index.js` from `./a`
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for (let ext of extensions) {
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let full = `${file}/index${ext}`
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if (fs.existsSync(full)) {
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return full
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}
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}
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return null
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}
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function* _getModuleDependencies(filename, base, seen, ext = path.extname(filename)) {
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// Try to find the file
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let absoluteFile = resolveWithExtension(
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path.resolve(base, filename),
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jsExtensions.includes(ext) ? jsResolutionOrder : tsResolutionOrder
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)
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if (absoluteFile === null) return // File doesn't exist
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// Prevent infinite loops when there are circular dependencies
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if (seen.has(absoluteFile)) return // Already seen
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seen.add(absoluteFile)
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// Mark the file as a dependency
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yield absoluteFile
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// Resolve new base for new imports/requires
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base = path.dirname(absoluteFile)
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ext = path.extname(absoluteFile)
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let contents = fs.readFileSync(absoluteFile, 'utf-8')
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// Find imports/requires
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for (let match of [
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...contents.matchAll(/import[\s\S]*?['"](.{3,}?)['"]/gi),
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...contents.matchAll(/import[\s\S]*from[\s\S]*?['"](.{3,}?)['"]/gi),
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...contents.matchAll(/require\(['"`](.+)['"`]\)/gi),
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]) {
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// Bail out if it's not a relative file
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if (!match[1].startsWith('.')) continue
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yield* _getModuleDependencies(match[1], base, seen, ext)
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}
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}
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export default function getModuleDependencies(absoluteFilePath) {
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if (absoluteFilePath === null) return new Set()
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return new Set(
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_getModuleDependencies(absoluteFilePath, path.dirname(absoluteFilePath), new Set())
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)
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}
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