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Memoize module resolution #177

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Memoize module resolution #177

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6 changes: 5 additions & 1 deletion src/register.ts
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Expand Up @@ -69,6 +69,7 @@ export function register(explicitParams: ExplicitParams): () => void {
configLoaderResult.mainFields,
configLoaderResult.addMatchAll
);
const matchPathCache: Record<string, string | undefined> = {};

// Patch node's module loading
// tslint:disable-next-line:no-require-imports variable-name
Expand All @@ -79,7 +80,10 @@ export function register(explicitParams: ExplicitParams): () => void {
Module._resolveFilename = function (request: string, _parent: any): string {
const isCoreModule = coreModules.hasOwnProperty(request);
if (!isCoreModule) {
const found = matchPath(request);
if (!(request in matchPathCache)) {
matchPathCache[request] = matchPath(request);
}
const found = matchPathCache[request];
if (found) {
const modifiedArguments = [found, ...[].slice.call(arguments, 1)]; // Passes all arguments. Even those that is not specified above.
// tslint:disable-next-line:no-invalid-this
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