cy.task() must only be invoked from the spec file or support file

[Pavel4444]

Current behavior

When I executed tests (13.13.0) with this command snapshotIframeContents. I have error cy.task() must only be invoked from the spec file or support file.

Worked in version 12.3.0

Desired behavior

No response

Test code to reproduce

cypress\support\commands.ts

Cypress.Commands.add("snapshotIframeContents", { prevSubject: "element" }, (subject) => {
    return cy
        .wrap(subject[0])
        .its("0.contentWindow.document.body.innerHTML")
        .then(async (innerHTML: string) => {
            const wrapper = document.createElement("div");
            wrapper.innerHTML = innerHTML;
            // Remove style since its compilation differs between enviroments
            Array.from(wrapper.querySelectorAll("style")).forEach((element) => element.remove());
            // Reduce base64 image size
            await Promise.all(
                Array.from(wrapper.querySelectorAll("img")).map(async (element) => {
                    if (/data:image\//.exec(element.src)) {
                        // Taken from: https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/digest, there is no nicer way of doing this
                        const msgUint8 = new TextEncoder().encode(element.src); // encode as (utf-8) Uint8Array
                        const hashBuffer = await crypto.subtle.digest("SHA-256", msgUint8); // hash the message
                        const hashArray = Array.from(new Uint8Array(hashBuffer)); // convert buffer to byte array
                        const hashHex = hashArray
                            .map((b) => b.toString(16).padStart(2, "0"))
                            .join(""); // convert bytes to hex string
                        element.src = hashHex;
                    }
                }),
            );
            cy.wrap(wrapper).toMatchSnapshot();    //problem here
        });
});

also tried this variant with spy:

Cypress.Commands.add("snapshotIframeContents", { prevSubject: "element" }, (subject) => {
    const callbackSpy = cy.spy().as("callbackSpy");
    cy.wrap(subject[0])
        .its("0.contentWindow.document.body.innerHTML")
        .then(async (innerHTML: string) => {
            const wrapper = document.createElement("div");
            wrapper.innerHTML = innerHTML;
            // Remove style since its compilation differs between enviroments
            Array.from(wrapper.querySelectorAll("style")).forEach((element) => element.remove());
            // Reduce base64 image size
            await Promise.all(
                Array.from(wrapper.querySelectorAll("img")).map(async (element) => {
                    if (/data:image\//.exec(element.src)) {
                        // Taken from: https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/digest, there is no nicer way of doing this
                        const msgUint8 = new TextEncoder().encode(element.src); // encode as (utf-8) Uint8Array
                        const hashBuffer = await crypto.subtle.digest("SHA-256", msgUint8); // hash the message
                        const hashArray = Array.from(new Uint8Array(hashBuffer)); // convert buffer to byte array
                        const hashHex = hashArray
                            .map((b) => b.toString(16).padStart(2, "0"))
                            .join(""); // convert bytes to hex string
                        element.src = hashHex;
                    }
                }),
            );
            callbackSpy();
        });
    cy.get("@callbackSpy").should("be.called");
    cy.wrap(subject[0]).its("0.contentWindow.document.body.innerHTML").toMatchSnapshot();
});

calling it:

EhicReissue\ehicReissueFormCertificate.spec.ts

cy.log("8. Vyzkoušej tlačítko pro tisk");
 cy.get("[data-testid='newborn-certificate-printer']").snapshotIframeContents();

Cypress Version

13.13.0

Node version

18.20.3

Operating System

Windows 10 Pro

Debug Logs

No response

Other

No response

[MikeMcC399]

Issues with the same error message:

• Error: "cy.task() must only be invoked from the spec file or support file" when calling cy.task() #29192
• Error using cy.task(): cy.task() must only be invoked from the spec file or support file #27784