SyntaxError: Unexpected identifier 'assert' in Node 22 LTS

[gillisandrew]

Describe the bug
Code will fail to run in Node 22 LTS with the following error:

import WorkflowSchema from "../workflow-v1.0.json" assert { type: "json" };
                                                   ^^^^^^

SyntaxError: Unexpected identifier 'assert'
    at compileSourceTextModule (node:internal/modules/esm/utils:340:16)
    at ModuleLoader.moduleStrategy (node:internal/modules/esm/translators:102:18)
    at #translate (node:internal/modules/esm/loader:433:12)
    at ModuleLoader.loadAndTranslate (node:internal/modules/esm/loader:480:27)

Node.js v22.11.0

This is the relevant line in the source:

languageservices/workflow-parser/src/workflows/workflow-schema.ts

Line 3 in 3a8c29c

import WorkflowSchema from "../workflow-v1.0.json" assert {type: "json"};

Package/Area

• Expressions
• Workflow Parser
• Language Service
• Language Server

Package Version
@actions/[email protected]

Additional context
This is related to Node dropping support for the non-standard assert syntax (see nodejs/node#52104)
I only checked with Workflow Parser but a search shows it will also impact Language Service

languageservices/languageservice/src/context-providers/descriptions.ts

Line 1 in 3a8c29c

import descriptions from "./descriptions.json" assert {type: "json"};

languageservices/languageservice/src/context-providers/events/eventPayloads.ts

Lines 7 to 8 in 3a8c29c

	import workflow_call from "./workflow_call.json" assert {type: "json"};

languageservices/languageservice/script/webhooks/index.ts

Line 4 in 3a8c29c

import schemaImport from "rest-api-description/descriptions/api.github.com/dereferenced/api.github.com.deref.json" assert {type: "json"};