feat: resolve ESM imports of host-provided modules to the server's copy - #2958
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dirkwa wants to merge 5 commits into
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feat: resolve ESM imports of host-provided modules to the server's copy#2958dirkwa wants to merge 5 commits into
dirkwa wants to merge 5 commits into
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Plugins installed in the data dir resolve dependencies from their own
tree, so one plugin's tight pin on a core interface package holds the
hoisted copy back for every other plugin whose range still admits it,
and dual copies break object identity with server code.
Generalize the baconjs-compat resolution hook into a host-provided
modules list (the require('vscode') model): require() of baconjs and
@signalk/server-api — including exported subpaths like
@signalk/server-api/history — now always resolves to the server's own
copy, regardless of what npm installed in the plugin tree. Subpaths
the host copy does not export resolve normally, so deep requires into
bundled copies keep working. baconjs-compat keeps only the
.map('.property') shorthand patch.
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📝 WalkthroughWalkthroughThe PR adds CommonJS and optional ESM host-module resolution for ChangesHost module resolution
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to The PR adds feature-detected ESM resolution for host-provided modules and corresponding tests; no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant Plugin
participant NodeResolver
participant host_modules
participant HostCopy
Plugin->>NodeResolver: import or require supported package
NodeResolver->>host_modules: run resolution hook
host_modules->>HostCopy: resolve host-installed module
HostCopy-->>Plugin: load host module
host_modules-->>NodeResolver: delegate unsupported subpath
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🧪 Generate unit tests (beta)
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Inline comments:
In `@test/host-modules.ts`:
- Around line 52-70: Update the ESM fixture setup around esmPlugin so the
directory is created and imported only when Module.registerHooks is available.
Keep the existing fixture contents and writeStaleBundledCopies behavior
unchanged for supported Node versions, while leaving esmPlugin unset otherwise
so setup does not attempt the incompatible native ESM import.
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src/baconjs-compat.tssrc/host-modules.tssrc/index.tstest/host-modules.ts
dirkwa
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Closes #2845.
Stacked on #2844 — merge that first. This branch carries #2844's commits plus one commit on top; once #2844 lands I will rebase so only that one commit remains.
#2844 redirects
require()of host-provided core packages (baconjs,@signalk/server-api, including exported subpaths) to the server's own copy via the CJSModule._resolveFilenamehook. A pureimportstatement in an ESM plugin never reaches that hook, so such a plugin bundling a stale copy could still load it and lose shared module identity with the server. It is actually worse than staleness: an exported subpath import like@signalk/server-api/historyfails to load outright against a bundled copy that has no exports map, because ESM resolution requires file extensions in that case.module.registerHooks()(Node ≥ 22.15) answers resolution for both module systems, so where available the same host-provided list is now redirected for ESM importers too, sharing the resolution cache with the CJS hook. It is feature-detected: on Node 22.0–22.14 (the engines range is>=22) coverage remains CJS-only, exactly as before this change.No re-entrancy guard is needed:
registerHooksresolve hooks interceptrequire()as well, but not direct calls to the captured_resolveFilenamethatresolveHostPathuses — verified empirically before implementation.Tested:
test/host-modules.tsgains an ESM fixture plugin ("type": "module", pureimportstatements) bundling the same stale sentinel copies, with four tests mirroring the existing CJS ones (skipped on Node withoutregisterHooks). As a negative control, running the new tests with the hook removed makes the ESM fixture fail to load entirely.Summary
This PR adds ESM resolution for host-provided
baconjsand@signalk/server-apimodules.module.registerHooks()when Node.js 22.15 or later provides it.baconjs-compatto focus on BaconJS 3.x compatibility.module.registerHooks()is unavailable.