running cypress test cases with assertion expect(xhr.requestBody.test).to.not.exist, but eslint thro-CodePudding

 cy.wait("api").then((xhr: any) => {
      expect(xhr.method).to.eq("POST");
      expect(xhr.status).to.eq(200);
      expect(xhr.requestBody.test).to.not.exist;
    });

expect(xhr.requestBody.test).to.not.exist; this line throws eslint error as shown below:

error  Expected an assignment or function call and instead saw an expression  @typescript-eslint/no-unused-expressions

CodePudding user response：

In my opinion you have multiple options to solve this:

First and recommended option is to rewrite your assertion for example as follows:

const bodyContainsTest = xhr.requestBody.hasOwnProperty('test');
expect(bodyContainsTest).to.be.false;

Second option would be to simply disable that rule for the next line:

// eslint-disable-next-line @typescript-eslint/no-unused-expressions
expect(xhr.requestBody.test).to.not.exist;

Another option would be to disable this rule globally for all Cypress test files in your .eslintrc.json if needed:

"@typescript-eslint/no-unused-expressions": "off",

CodePudding user response：

Verified at tslint-playground.

Two alternates that pass the linter:

expect(xhr.requestBody).to.not.have.property(test)

expect(xhr.requestBody.test).to.eq(undefined)