Apex Language Server fails to custom JS heap size

[nwcm]

Summary

configuring a custom memory amount stops the apex language server from working

Steps To Reproduce:

1. set custom memory in settings
2. see logs

Expected result

server works with custom memory setting

Actual result

[Debug - 12:05:44 PM] ApexSymbolProcessingManager initialization complete
[WorkerCoordinator] Worker script (node): c:\Users\x\.kiro\extensions\salesforce.apex-language-server-extension-0.8.0-universal\dist\worker.platform.js
timestamp=2026-07-28T02:05:41.124Z level=WARN fiber=#13 cause="Error: Initiated Worker with invalid execArgv flags: --max-old-space-size=12288
    at new Worker (node:internal/worker:225:13)
    at _id (c:\Users\x\.kiro\extensions\salesforce.apex-language-server-extension-0.8.0-universal\src\server\WorkerCoordinator.ts:100:15)
    at <anonymous> (c:\Users\x\.kiro\node_modules\@effect\platform\src\internal\worker.ts:428:59)" module=Worker package=@effect/platform
[Debug - 12:06:11 PM] [QUEUE] State: Critical=0(0), Immediate=0(0), High=0(0), Normal=0(0), Low=0(0), Background=0(0) | Started=0, Completed=0, Dropped=0

Additional information

Project Info:

Project Info

Generated: 2026-07-28T01:45:07.762Z

Metadata

sourceApiVersion: 66.0
packageDirectories: 7
namespace: ThisNamespace

Types

Type	Components	Files	Size (KB)
ApexClass	2088	6264	34500
ApexPage	7	21	51
ApexTestSuite	13	13	27
ApexTrigger	59	177	38
AuraDefinitionBundle	195	1178	1018
BusinessProcess	4	4	1
CompactLayout	16	16	5
ContentAsset	3	9	90
CustomApplication	3	3	38
CustomField	908	908	671
CustomLabels	5	5	412
CustomMetadata	504	504	551
CustomNotificationType	2	2	1
CustomObject	309	5202	6866
CustomPageWebLink	1	1	1
CustomPermission	36	36	9
CustomTab	62	62	12
DataWeaveResource	1	3	3
DuplicateRule	1	1	1
ExternalClientApplication	4	4	3
ExternalCredential	1	1	1
ExtlClntAppConfigurablePolicies	1	1	0
ExtlClntAppOauthConfigurablePolicies	1	1	1
ExtlClntAppOauthSettings	4	4	2
FieldSet	54	54	89
FlexiPage	93	93	1819
Flow	11	11	130
GlobalValueSet	11	11	17
InvocableActionExtension	2	2	23
Layout	332	332	1874
LightningComponentBundle	628	2968	7580
LightningMessageChannel	3	3	2
ListView	14	14	6
MatchingRules	1	1	1
NamedCredential	1	1	1
NotificationTypeConfig	1	1	0
PathAssistant	8	8	3
PermissionSet	59	59	2091
PlatformCachePartition	1	1	1
Profile	1	1	65
QuickAction	74	74	86
RecordType	161	161	1971
RemoteSiteSetting	3	3	1
Report	27	27	57
ReportFolder	7	7	1
ReportType	10	10	163
Settings	1	1	0
StandardValueSet	10	10	40
StaticResource	32	2934	29657
ValidationRule	43	43	27
WebLink	2	2	1

Org

Key	Value
Org type	scratch
Source tracking	true
SourceMember count	14382

Settings

Setting	Value
salesforcedx-vscode-metadata.showSuccessNotification	false
salesforcedx-vscode-metadata.sourceTracking.pollingIntervalSeconds	60
salesforcedx-vscode-core.push-or-deploy-on-save.enabled	false
salesforcedx-vscode-core.push-or-deploy-on-save.ignoreConflictsOnPush	false
salesforcedx-vscode-core.detectConflictsForDeployAndRetrieve	false
salesforcedx-vscode-core.clearOutputTab	false
salesforcedx-vscode-core.show-cli-success-msg	true
salesforcedx-vscode-core.telemetry.enabled	false
salesforcedx-vscode-core.enable-sobject-refresh-on-startup	false
salesforcedx-vscode-core.telemetry-tag
salesforcedx-vscode-salesforcedx.enableLocalTraces	false
salesforcedx-vscode-salesforcedx.enableConsoleTraces	false
salesforcedx-vscode-salesforcedx.enableFileTraces	false
salesforcedx-vscode-apex.java.home

Environment

Key	Value
Salesforce CLI	@salesforce/cli/2.144.6 win32-x64 node-v24.18.0
Java	openjdk 25.0.4 2026-07-21 LTS
Editor	Kiro
VS Code	1.107.1
Node	v22.22.0
OS	Windows_NT 10.0.26200

Extensions (Salesforce)

Extension	Version
salesforce.apex-language-server-extension	0.8.0
salesforce.salesforce-vscode-slds	1.4.8
salesforce.salesforcedx-vscode	67.6.0
salesforce.salesforcedx-vscode-apex	67.6.0
salesforce.salesforcedx-vscode-apex-debugger	67.6.0
salesforce.salesforcedx-vscode-apex-log	67.6.0
salesforce.salesforcedx-vscode-apex-testing	67.6.0
salesforce.salesforcedx-vscode-core	67.6.0
salesforce.salesforcedx-vscode-expanded	67.6.0
salesforce.salesforcedx-vscode-lightning	67.6.0
salesforce.salesforcedx-vscode-lwc	67.6.0
salesforce.salesforcedx-vscode-metadata	67.6.0
salesforce.salesforcedx-vscode-org	67.6.0
salesforce.salesforcedx-vscode-services	67.6.0
salesforce.salesforcedx-vscode-soql	67.6.0
salesforce.salesforcedx-vscode-ui-preview	1.3.0
salesforce.salesforcedx-vscode-visualforce	67.6.0

[svc-idee-bot]

Thank you for filing this issue. We appreciate your feedback and will review the issue as soon as possible. Remember, however, that GitHub isn't a mechanism for receiving support under any agreement or SLA. If you require immediate assistance, contact Salesforce Customer Support.

[peternhale]

@nwcm May I ask what symptoms lead you to raise the heap size.

[git2gus]

This issue has been linked to a new work item: W-23610333

[peternhale]

PR 591 in apex-language-support.