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35 lines
1011 B
35 lines
1011 B
7 years ago
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import url from 'url';
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import path from 'path';
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import process from 'process';
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const builtins = new Set(
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Object.keys(process.binding('natives')).filter((str) =>
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/^(?!(?:internal|node|v8)\/)/.test(str))
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);
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const JS_EXTENSIONS = new Set(['.js', '.mjs']);
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export function resolve(specifier, parentModuleURL/*, defaultResolve */) {
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if (builtins.has(specifier)) {
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return {
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url: specifier,
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format: 'builtin'
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};
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}
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if (/^\.{0,2}[/]/.test(specifier) !== true && !specifier.startsWith('file:')) {
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// For node_modules support:
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// return defaultResolve(specifier, parentModuleURL);
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throw new Error(
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`imports must begin with '/', './', or '../'; '${specifier}' does not`);
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}
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const resolved = new url.URL(specifier, parentModuleURL);
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const ext = path.extname(resolved.pathname);
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if (!JS_EXTENSIONS.has(ext)) {
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throw new Error(
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`Cannot load file with non-JavaScript file extension ${ext}.`);
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}
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return {
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url: resolved.href,
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format: 'esm'
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};
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}
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