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import { URL } from 'url';
import path from 'path';
import process from 'process';
import { builtinModules } from 'module';
const JS_EXTENSIONS = new Set(['.js', '.mjs']);
const baseURL = new URL('file://');
baseURL.pathname = process.cwd() + '/';
export function resolve(specifier, { parentURL = baseURL }, defaultResolve) {
if (builtinModules.includes(specifier)) {
return {
url: specifier
};
}
if (/^\.{1,2}[/]/.test(specifier) !== true && !specifier.startsWith('file:')) {
// For node_modules support:
// return defaultResolve(specifier, {parentURL}, defaultResolve);
throw new Error(
`imports must be URLs or begin with './', or '../'; '${specifier}' does not`);
}
const resolved = new URL(specifier, parentURL);
return {
url: resolved.href
};
}
export function getFormat(url, context, defaultGetFormat) {
if (builtinModules.includes(url)) {
return {
format: 'builtin'
};
}
const { pathname } = new URL(url);
const ext = path.extname(pathname);
if (!JS_EXTENSIONS.has(ext)) {
throw new Error(
`Cannot load file with non-JavaScript file extension ${ext}.`);
}
return {
format: 'module'
};
}
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