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- let globalPnpApi;
- try {
- globalPnpApi = require(`pnpapi`);
- } catch {
- // Just ignore if we don't have a global PnP instance - perhaps
- // we'll eventually find one at runtime due to multi-tree
- }
- const createRequire = require(`./createRequire`);
- const getDefaultResolver = require(`./getDefaultResolver`);
- module.exports = (request, options) => {
- const {
- basedir,
- defaultResolver = getDefaultResolver(),
- extensions,
- } = options;
- if (process.versions.pnp) {
- let pnpApi = globalPnpApi;
- // While technically it would be more correct to run this code
- // everytime (since they file being run *may* belong to a
- // different dependency tree than the one owning Jest), in
- // practice this doesn't happen anywhere else than on the Jest
- // repository itself (in the test env). So in order to preserve
- // the performances, we can afford a slight incoherence here.
- if (!pnpApi) {
- try {
- const baseReq = createRequire(`${basedir}/internal.js`);
- pnpApi = baseReq(`pnpapi`);
- } catch {
- // The file isn't part of a PnP dependency tree, so we can
- // just use the default Jest resolver.
- }
- }
- if (pnpApi) {
- const resolution = pnpApi.resolveRequest(request, `${basedir}/`, {extensions});
- // When the request is a native module, Jest expects to get the string back unmodified, but pnp returns null instead.
- if (resolution === null)
- return request;
- return resolution;
- }
- }
- return defaultResolver(request, {...options, allowPnp: false});
- };
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