Created At Dec 16, 2025

A React Pitfall by Previous Developers

An incident was reported yesterday.

After analyzing the cause, I discovered that all the Page components inherited from a BasePage component that had already implemented the componentDidMount method.

A recent update involved implementing the componentDidMount method for PageA.

Naturally, super.componentDidMount() was not called.

After all, who would have thought the previous programmer would leave such a pitfall?

class BasePage extends React.Component {
    componentDidMount() {
        this.initializeEssentialServices(); 
    }
    /* ... */
}

class PageA extends BasePage {

    /* 
    This method was implemented in a recent update
    without calling super.componentDidMount()
    */
    componentDidMount() {
        this.loadSpecificData(); 
    }
    /* ... */
}