Function handler

packages/vite/src/node/config.ts:2463–2510

(id, importer, { kind })

        resolveId: {
          filter: { id: /^[^.#].*/ },
          handler(id, importer, { kind }) {
            if (!importer || path.isAbsolute(id) || isNodeBuiltin(id)) {
              return
            }

            // With the `isNodeBuiltin` check above, this check captures if the builtin is a
            // non-node built-in, which esbuild doesn't know how to handle. In that case, we
            // externalize it so the non-node runtime handles it instead.
            if (isNodeLikeBuiltin(id) || id.startsWith('npm:')) {
              return { id, external: true }
            }

            const isImport = isESM || kind === 'dynamic-import'
            let idFsPath: string | undefined
            try {
              idFsPath = nodeResolveWithVite(id, importer, {
                root,
                isRequire: !isImport,
              })
            } catch (e) {
              if (!isImport) {
                let canResolveWithImport = false
                try {
                  canResolveWithImport = !!nodeResolveWithVite(id, importer, {
                    root,
                  })
                } catch {}
                if (canResolveWithImport) {
                  throw new Error(
                    `Failed to resolve ${JSON.stringify(
                      id,
                    )}. This package is ESM only but it was tried to load by \`require\`. See https://vite.dev/guide/troubleshooting.html#this-package-is-esm-only for more details.`,
                  )
                }
              }
              throw e
            }
            if (!idFsPath) return
            // always no-externalize json files as rolldown does not support import attributes
            if (idFsPath.endsWith('.json')) {
              return idFsPath
            }

            if (idFsPath && isImport) {
              idFsPath = pathToFileURL(idFsPath).href
            }
            return { id: idFsPath, external: true }
          },
        },
      },
      {