fix: ensure importMap is reliably generated during HMR (fixes Next.js 16 issue) #14474

AlessioGr · 2025-11-05T01:15:21Z

Problem

Next.js 16 changes the order of getPayload() calls during HMR. In testing, the frontend now calls getPayload() before the admin panel does. Since the frontend typically has skipImportMapGeneration: true (due to no importMap passed to getPayload), this was skipping import map generation entirely, breaking the admin panel.

Solution

This PR ensures the import map is always regenerated during HMR by passing false as the second parameter to reload(), regardless of the options.importMap value passed to getPayload().

Additionally, a new ignoreResolveError option is added to handle cases where getPayload() is called exclusively from the frontend (where no import map file exists). This prevents errors from interrupting the HMR process in frontend-only scenarios.

github-actions · 2025-11-05T01:22:07Z

📦 esbuild Bundle Analysis for payload

This analysis was generated by esbuild-bundle-analyzer. 🤖

Meta File	Out File	Size (raw)	Note
packages/next/meta_index.json	esbuild/index.js	755.53 KB	🆕 Added
packages/payload/meta_index.json	esbuild/index.js	1.23 MB	🆕 Added
packages/payload/meta_shared.json	esbuild/exports/shared.js	163.07 KB	🆕 Added
packages/richtext-lexical/meta_client.json	esbuild/exports/client_optimized/index.js	279.48 KB	🆕 Added
packages/ui/meta_client.json	esbuild/exports/client_optimized/index.js	1.15 MB	🆕 Added
packages/ui/meta_shared.json	esbuild/exports/shared_optimized/index.js	14.39 KB	🆕 Added

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Details

Next to the size is how much the size has increased or decreased compared with the base branch of this PR.

‼️: Size increased by 20% or more. Special attention should be given to this.
⚠️: Size increased in acceptable range (lower than 20%).
✅: No change or even downsized.
🗑️: The out file is deleted: not found in base branch.
🆕: The out file is newly found: will be added to base branch.

…te-importmap

AlessioGr · 2025-11-05T01:33:39Z

packages/payload/src/bin/generateImportMap/utilities/resolveImportMapFilePath.ts

  importMapFile?: string
  rootDir: string
-}) {
+}): Promise<Error | string> {


this fn is not exported. => not breaking

github-actions · 2025-11-07T15:16:42Z

🚀 This is included in version v3.63.0

commit

9113469

github-actions bot added the created-by: Payload team label Nov 5, 2025

AlessioGr added 2 commits November 4, 2025 17:29

ignore resolve error

cd6b788

Merge remote-tracking branch 'origin/main' into fix/hmr-always-genera…

c0bd36f

…te-importmap

AlessioGr marked this pull request as ready for review November 5, 2025 01:31

AlessioGr changed the title ~~fix: ensure importMap is reliably generated during HMR~~ fix: ensure importMap is reliably generated during HMR (fixes Next.js 16 issue) Nov 5, 2025

AlessioGr commented Nov 5, 2025

View reviewed changes

AlessioGr added 2 commits November 4, 2025 17:34

fix comment

e97fe75

fix comment

e0893f7

AlessioGr enabled auto-merge (squash) November 5, 2025 01:36

paulpopus approved these changes Nov 5, 2025

View reviewed changes

AlessioGr merged commit 61a7095 into main Nov 5, 2025
91 checks passed

AlessioGr deleted the fix/hmr-always-generate-importmap branch November 5, 2025 02:04

AlessioGr mentioned this pull request Nov 5, 2025

feat: next.js 16 support #14456

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fix: ensure importMap is reliably generated during HMR (fixes Next.js 16 issue) #14474

fix: ensure importMap is reliably generated during HMR (fixes Next.js 16 issue) #14474

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Meta file: packages/next/meta_index.json, Out file: esbuild/index.js

Meta file: packages/payload/meta_index.json, Out file: esbuild/index.js

Meta file: packages/payload/meta_shared.json, Out file: esbuild/exports/shared.js

Meta file: packages/richtext-lexical/meta_client.json, Out file: esbuild/exports/client_optimized/index.js

Meta file: packages/ui/meta_client.json, Out file: esbuild/exports/client_optimized/index.js

Meta file: packages/ui/meta_shared.json, Out file: esbuild/exports/shared_optimized/index.js

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fix: ensure importMap is reliably generated during HMR (fixes Next.js 16 issue) #14474

fix: ensure importMap is reliably generated during HMR (fixes Next.js 16 issue) #14474

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📦 esbuild Bundle Analysis for payload

Meta file: packages/next/meta_index.json, Out file: esbuild/index.js

Meta file: packages/payload/meta_index.json, Out file: esbuild/index.js

Meta file: packages/payload/meta_shared.json, Out file: esbuild/exports/shared.js

Meta file: packages/richtext-lexical/meta_client.json, Out file: esbuild/exports/client_optimized/index.js

Meta file: packages/ui/meta_client.json, Out file: esbuild/exports/client_optimized/index.js

Meta file: packages/ui/meta_shared.json, Out file: esbuild/exports/shared_optimized/index.js

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AlessioGr commented Nov 5, 2025 •

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