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// @ts-check
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/** This script modifies the project to support TS code in .svelte files like: |
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<script lang="ts"> |
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export let name: string; |
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</script> |
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As well as validating the code for CI. |
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*/ |
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/** To work on this script: |
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rm -rf test-template template && git clone sveltejs/template test-template && node scripts/setupTypeScript.js test-template |
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*/ |
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const fs = require("fs") |
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const path = require("path") |
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const { argv } = require("process") |
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const projectRoot = argv[2] || path.join(__dirname, "..") |
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// Add deps to pkg.json
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const packageJSON = JSON.parse(fs.readFileSync(path.join(projectRoot, "package.json"), "utf8")) |
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packageJSON.devDependencies = Object.assign(packageJSON.devDependencies, { |
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"svelte-check": "^1.0.0", |
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"svelte-preprocess": "^4.0.0", |
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"@rollup/plugin-typescript": "^6.0.0", |
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"typescript": "^3.9.3", |
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"tslib": "^2.0.0", |
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"@tsconfig/svelte": "^1.0.0" |
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}) |
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// Add script for checking
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packageJSON.scripts = Object.assign(packageJSON.scripts, { |
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"validate": "svelte-check" |
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}) |
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// Write the package JSON
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fs.writeFileSync(path.join(projectRoot, "package.json"), JSON.stringify(packageJSON, null, " ")) |
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// mv src/main.js to main.ts - note, we need to edit rollup.config.js for this too
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const beforeMainJSPath = path.join(projectRoot, "src", "main.js") |
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const afterMainTSPath = path.join(projectRoot, "src", "main.ts") |
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fs.renameSync(beforeMainJSPath, afterMainTSPath) |
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// Switch the app.svelte file to use TS
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const appSveltePath = path.join(projectRoot, "src", "App.svelte") |
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let appFile = fs.readFileSync(appSveltePath, "utf8") |
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appFile = appFile.replace("<script>", '<script lang="ts">') |
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appFile = appFile.replace("export let name;", 'export let name: string;') |
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fs.writeFileSync(appSveltePath, appFile) |
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// Edit rollup config
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const rollupConfigPath = path.join(projectRoot, "rollup.config.js") |
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let rollupConfig = fs.readFileSync(rollupConfigPath, "utf8") |
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// Edit imports
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rollupConfig = rollupConfig.replace(`'rollup-plugin-terser';`, `'rollup-plugin-terser';
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import sveltePreprocess from 'svelte-preprocess'; |
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import typescript from '@rollup/plugin-typescript';`)
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// Replace name of entry point
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rollupConfig = rollupConfig.replace(`'src/main.js'`, `'src/main.ts'`) |
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// Add preprocess to the svelte config, this is tricky because there's no easy signifier.
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// Instead we look for `css:` then the next `}` and add the preprocessor to that
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let foundCSS = false |
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let match |
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// https://regex101.com/r/OtNjwo/1
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const configEditor = new RegExp(/css:.|\n*}/gmi) |
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while (( match = configEditor.exec(rollupConfig)) != null) { |
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if (foundCSS) { |
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const endOfCSSIndex = match.index + 1 |
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rollupConfig = rollupConfig.slice(0, endOfCSSIndex) + ",\n preprocess: sveltePreprocess()," + rollupConfig.slice(endOfCSSIndex); |
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break |
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} |
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if (match[0].includes("css:")) foundCSS = true |
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} |
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// Add TypeScript
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rollupConfig = rollupConfig.replace( |
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'commonjs(),', |
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'commonjs(),\n\t\ttypescript({\n\t\t\tsourceMap: !production,\n\t\t\tinlineSources: !production\n\t\t}),' |
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); |
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fs.writeFileSync(rollupConfigPath, rollupConfig) |
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// Add TSConfig
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const tsconfig = `{
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"extends": "@tsconfig/svelte/tsconfig.json", |
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"include": ["src/**/*"], |
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"exclude": ["node_modules/*", "__sapper__/*", "public/*"], |
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}` |
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const tsconfigPath = path.join(projectRoot, "tsconfig.json") |
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fs.writeFileSync(tsconfigPath, tsconfig) |
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// Delete this script, but not during testing
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if (!argv[2]) { |
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// Remove the script
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fs.unlinkSync(path.join(__filename)) |
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// Check for Mac's DS_store file, and if it's the only one left remove it
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const remainingFiles = fs.readdirSync(path.join(__dirname)) |
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if (remainingFiles.length === 1 && remainingFiles[0] === '.DS_store') { |
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fs.unlinkSync(path.join(__dirname, '.DS_store')) |
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} |
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// Check if the scripts folder is empty
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if (fs.readdirSync(path.join(__dirname)).length === 0) { |
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// Remove the scripts folder
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fs.rmdirSync(path.join(__dirname)) |
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} |
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} |
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// Adds the extension recommendation
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fs.mkdirSync(path.join(projectRoot, ".vscode")) |
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fs.writeFileSync(path.join(projectRoot, ".vscode", "extensions.json"), `{
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"recommendations": ["svelte.svelte-vscode"] |
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} |
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`)
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console.log("Converted to TypeScript.") |
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if (fs.existsSync(path.join(projectRoot, "node_modules"))) { |
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console.log("\nYou will need to re-run your dependency manager to get started.") |
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} |
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