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| 1 | +// preact does not support more modern TypeScript versions, which breaks our users that depend on older |
| 2 | +// TypeScript versions. To fix this, we shim the types from preact to be any and remove the dependency on preact |
| 3 | +// for types directly. This script is meant to be run after the build/npm/types-ts3.8 directory is created. |
| 4 | + |
| 5 | +// Path: build/npm/types-ts3.8/global.d.ts |
| 6 | + |
| 7 | +const fs = require('fs'); |
| 8 | +const path = require('path'); |
| 9 | + |
| 10 | +/** |
| 11 | + * This regex looks for preact imports we can replace and shim out. |
| 12 | + * |
| 13 | + * Example: |
| 14 | + * import { ComponentChildren, VNode } from 'preact'; |
| 15 | + */ |
| 16 | +const preactImportRegex = /import\s*{\s*([\w\s,]+)\s*}\s*from\s*'preact'\s*;?/; |
| 17 | + |
| 18 | +function walk(dir) { |
| 19 | + const files = fs.readdirSync(dir); |
| 20 | + files.forEach(file => { |
| 21 | + const filePath = path.join(dir, file); |
| 22 | + const stat = fs.lstatSync(filePath); |
| 23 | + if (stat.isDirectory()) { |
| 24 | + walk(filePath); |
| 25 | + } else { |
| 26 | + if (filePath.endsWith('.d.ts')) { |
| 27 | + const content = fs.readFileSync(filePath, 'utf8'); |
| 28 | + const capture = preactImportRegex.exec(content); |
| 29 | + if (capture) { |
| 30 | + const groups = capture[1].split(',').map(s => s.trim()); |
| 31 | + |
| 32 | + // This generates a shim snippet to replace the type imports from preact |
| 33 | + // It generates a snippet based on the capture groups of preactImportRegex. |
| 34 | + // |
| 35 | + // Example: |
| 36 | + // |
| 37 | + // import type { ComponentChildren, VNode } from 'preact'; |
| 38 | + // becomes |
| 39 | + // type ComponentChildren: any; |
| 40 | + // type VNode: any; |
| 41 | + const snippet = groups.reduce((acc, curr) => { |
| 42 | + const searchableValue = curr.includes(' as ') ? curr.split(' as ')[1] : curr; |
| 43 | + |
| 44 | + // look to see if imported as value, then we have to use declare const |
| 45 | + if (content.includes(`typeof ${searchableValue}`)) { |
| 46 | + return `${acc}declare const ${searchableValue}: any;\n`; |
| 47 | + } |
| 48 | + |
| 49 | + // look to see if generic type like Foo<T> |
| 50 | + if (content.includes(`${searchableValue}<`)) { |
| 51 | + return `${acc}type ${searchableValue}<T> = any;\n`; |
| 52 | + } |
| 53 | + |
| 54 | + // otherwise we can just leave as type |
| 55 | + return `${acc}type ${searchableValue} = any;\n`; |
| 56 | + }, ''); |
| 57 | + |
| 58 | + // we then can remove the import from preact |
| 59 | + const newContent = content.replace(preactImportRegex, '// replaced import from preact'); |
| 60 | + |
| 61 | + // and write the new content to the file |
| 62 | + fs.writeFileSync(filePath, snippet + newContent, 'utf8'); |
| 63 | + } |
| 64 | + } |
| 65 | + } |
| 66 | + }); |
| 67 | +} |
| 68 | + |
| 69 | +function run() { |
| 70 | + // recurse through build/npm/types-ts3.8 directory |
| 71 | + const dir = path.join('build', 'npm', 'types-ts3.8'); |
| 72 | + walk(dir); |
| 73 | +} |
| 74 | + |
| 75 | +run(); |
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