Upgrading to Angular 18 Leads to Issue with Spread Operator: 'TypeError: res is not iterable' Error

Following the migration of my Angular project from version 9 to version 18, a new error has surfaced:

ERROR TypeError: res is not iterable
    onEscalate details.component.ts:735
    RxJS 5
        next
        _next
        next
        next
        errorContext
core.mjs:7185:18
    Angular 2
        handleError
        next
    RxJS 6
    Angular 22
        emit
        onHandleError
        invoke
        run
        runOutsideAngular
        onHandleError
        handleError
        runTask
        invokeTask
        invoke
        0
    (Async: setTimeout handler)
        scheduleTask
        scheduleTask
        onScheduleTask
        scheduleTask
        onScheduleTask
        scheduleTask
        scheduleTask
        scheduleMacroTask
        scheduleMacroTaskWithCurrentZone
        setNative
        name
    RxJS 9
        setTimeout
        reportUnhandledError
        handleUnhandledError
        next
        _next
        next
        next
        errorContext
        next
    Angular 3
    RxJS 6
    Angular 4
    RxJS 15
    Angular 26
    onSubmit escalation-assign.component.ts:130
    EscalationAssignComponent_Template_button_click_98_listener escalation-assign.component.html:171
    Angular 28
    EscalationAssignComponent_Template escalation-assign.component.html:171
    Angular 13
    onEscalate details.component.ts:695

My suspicion lies with the 'res' variable, which should ideally be an iterable object, potentially an array. It seems that its format may have been altered during the migration process.

angulartypescriptnpmrxjs

Answer №1

To enhance your tsconfig.json, ensure to include DOM.iterable in the compilerOptions.lib section.

"lib": ["ES2022", "dom", "DOM.Iterable"]

Take a look at this example:

https://i.sstatic.net/9yF5zX1t.png

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