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cherrypick/packages/backend/test/loader.js

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/**
* ts-node/esmローダーに投げる前にpath mappingを解決する
* 参考
* - https://github.com/TypeStrong/ts-node/discussions/1450#discussioncomment-1806115
* - https://nodejs.org/api/esm.html#loaders
* https://github.com/TypeStrong/ts-node/pull/1585 が取り込まれたらこのカスタムローダーは必要なくなる
*/
import { resolve as resolveTs, load } from 'ts-node/esm';
import { loadConfig, createMatchPath } from 'tsconfig-paths';
import { pathToFileURL } from 'url';
const tsconfig = loadConfig();
const matchPath = createMatchPath(tsconfig.absoluteBaseUrl, tsconfig.paths);
export function resolve(specifier, ctx, defaultResolve) {
let resolvedSpecifier;
if (specifier.endsWith('.js')) {
// maybe transpiled
const specifierWithoutExtension = specifier.substring(0, specifier.length - '.js'.length);
const matchedSpecifier = matchPath(specifierWithoutExtension);
if (matchedSpecifier) {
resolvedSpecifier = pathToFileURL(`${matchedSpecifier}.js`).href;
}
} else {
const matchedSpecifier = matchPath(specifier);
if (matchedSpecifier) {
resolvedSpecifier = pathToFileURL(matchedSpecifier).href;
}
}
return resolveTs(resolvedSpecifier ?? specifier, ctx, defaultResolve);
}
export { load };