function resolveModuleName(request, issuer, compilerOptions, moduleResolutionHost, parentResolver) { const pnp = require(`pnpapi`); const [, prefix = ``, packageName = ``, rest] = request.match(/^(!(?:.*!)+)?((?!\.{0,2}\/)(?:@[^\/]+\/)?[^\/]+)?(.*)/); let failedLookupLocations = []; // First we try the resolution on "@types/package-name" starting from the project root if (packageName) { const typesPackagePath = `@types/${packageName.replace(/\//g, `__`)}${rest}`; let unqualified; try { unqualified = pnp.resolveToUnqualified(typesPackagePath, issuer, {considerBuiltins: false}); } catch (error) {} if (unqualified) { // TypeScript checks whether the directory of the candidate is a directory // which may cause issues w/ zip loading (since the zip archive is still // reported as a file). To workaround this we add a trailing slash, which // causes TypeScript to assume the parent is a directory. if (moduleResolutionHost.directoryExists && moduleResolutionHost.directoryExists(unqualified)) unqualified += `/`; const finalResolution = parentResolver(unqualified, issuer, compilerOptions, moduleResolutionHost); if (finalResolution.resolvedModule || finalResolution.resolvedTypeReferenceDirective) { return finalResolution; } else { failedLookupLocations = failedLookupLocations.concat(finalResolution.failedLookupLocations); } } } // Then we try on "package-name", this time starting from the package that makes the request if (true) { const regularPackagePath = `${packageName || ``}${rest}`; let unqualified; try { unqualified = pnp.resolveToUnqualified(regularPackagePath, issuer, {considerBuiltins: false}); } catch (error) {} if (unqualified) { // TypeScript checks whether the directory of the candidate is a directory // which may cause issues w/ zip loading (since the zip archive is still // reported as a file). To workaround this we add a trailing slash, which // causes TypeScript to assume the parent is a directory. if (moduleResolutionHost.directoryExists && moduleResolutionHost.directoryExists(unqualified)) unqualified += `/`; const finalResolution = parentResolver(unqualified, issuer, compilerOptions, moduleResolutionHost); if (finalResolution.resolvedModule || finalResolution.resolvedTypeReferenceDirective) { return finalResolution; } else { failedLookupLocations = failedLookupLocations.concat(finalResolution.failedLookupLocations); } } } return { resolvedModule: undefined, resolvedTypeReferenceDirective: undefined, failedLookupLocations, }; } module.exports.resolveModuleName = process.versions.pnp ? resolveModuleName : (moduleName, containingFile, compilerOptions, compilerHost, resolveModuleName) => resolveModuleName(moduleName, containingFile, compilerOptions, compilerHost);