What is the reason behind facing TS errors locally after pulling a PR and not on CI builds?

As I delve into e2e testing in Cypress using TypeScript, I am puzzled by the TS errors that are cropping up locally while everything runs smoothly on CI.

The peculiar thing is that these TS errors only started appearing after checking out a particular PR, even though no changes were made to the tsconfig settings. This has left me scratching my head wondering what could be causing this sudden issue.

Upon inspecting the current tsconfig file used in Cypress, I can see that it includes the resolveJsonModule option:

{
    "compilerOptions": {
        "strict": true,
        "target": "es6",
        "lib": ["esnext", "dom"],
        "baseUrl": "./",
        "resolveJsonModule": true,
        "esModuleInterop": true,
        "noImplicitAny": false,
        "types": ["cypress", "@testing-library/cypress"]
    },
    "include": ["**/*.ts"]
}

Interestingly, after cloning the aforementioned PR, a cascade of TS errors surfaced, none of which were present prior to implementing the PR: https://i.sstatic.net/MJf93.png

UPDATE: A breakthrough - it appears that the issue might be specific to Visual Studio Code (VSCODE) as the application builds flawlessly from the command line.

typescriptvisual-studio-codecypresse2e-testingcypress-testing-library

Answer №1

A potential explanation is that the ethers module was included in the PR, but may not be installed within your current project build. To resolve this issue, try running npm install.

Answer №2

To prevent errors in my coding environment, I included the following line to my JSON configuration settings within VScode. However, I am uncertain if this is the most efficient solution:

"typescript.validate.enable": false,

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