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* vitek:transform — rewrite relative and alias imports to root-relative paths
*/
import type { Plugin } from 'vite';
import * as path from 'path';
import MagicString from 'magic-string';
import {
normalizeModuleIdPath,
resolveWithExtension,
} from '../adapters/vite/path-utils.js';
import type { PluginContext } from './context.js';
function escapeRegex(s: string): string {
return s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
}
export function createTransformPlugin(ctx: PluginContext): Plugin {
return {
name: 'vitek:transform',
enforce: 'pre',
transform: {
filter: {
id: { include: /\.(tsx?|jsx?|mjs)$/, exclude: /node_modules/ },
},
handler(code: string, id: string) {
Iif (!ctx.root) return null;
Iif (id.includes('node_modules') || !/\.(tsx?|jsx?|mjs)$/.test(id)) return null;
const srcDir = path.resolve(ctx.root, ctx.options.srcDir ?? 'src');
const normalizedId = normalizeModuleIdPath(id, ctx.root);
if (!normalizedId.startsWith(srcDir)) return null;
const dir = path.dirname(normalizedId);
const rootSlash = path.resolve(ctx.root) + path.sep;
const s = new MagicString(code);
let hasChanges = false;
const relImportRe = /from\s+['"](\.\.?[^'"]+)['"]/g;
let match: RegExpExecArray | null;
while ((match = relImportRe.exec(code)) !== null) {
const specifier = match[1];
const candidate = path.resolve(dir, specifier);
if (!candidate.startsWith(rootSlash)) continue;
const target = resolveWithExtension(candidate);
if (!target) continue;
const rootRelative = path.relative(ctx.root, target).replace(/\\/g, '/');
const newSpecifier = `/${rootRelative}`;
const quote = match[0].includes('"') ? '"' : "'";
s.overwrite(match.index, match.index + match[0].length, `from ${quote}${newSpecifier}${quote}`);
hasChanges = true;
}
const alias = ctx.options.alias;
if (alias && Object.keys(alias).length > 0) {
const entries = Object.entries(alias)
.filter(([, v]) => v != null && v !== '')
.sort(([a], [b]) => b.length - a.length);
for (const [key, replacement] of entries) {
const escapedKey = escapeRegex(key);
const aliasRe = new RegExp(`from\\s+(['"])(${escapedKey})(/[^'"]*)?\\1`, 'g');
while ((match = aliasRe.exec(code)) !== null) {
const quote = match[1];
const rest = (match[3] || '').replace(/^\//, '');
const base = path.isAbsolute(replacement)
? path.join(replacement, rest)
: path.join(ctx.root, replacement, rest);
const target = resolveWithExtension(base);
Iif (!target) continue;
const rootRelative = path.relative(ctx.root, target).replace(/\\/g, '/');
const newSpecifier = `/${rootRelative}`;
s.overwrite(match.index, match.index + match[0].length, `from ${quote}${newSpecifier}${quote}`);
hasChanges = true;
}
}
}
if (!hasChanges) return null;
return {
code: s.toString(),
map: s.generateMap({ hires: 'boundary' }),
};
},
} as unknown as NonNullable<Plugin['transform']>,
};
}
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