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# Vue3 app.config.compilerOptions Property * * Vue3 Global API](#) `app.config.compilerOptions` is an important configuration option that allows developers to have fine-grained control over the compilation behavior of Vue applications. `app.config.compilerOptions` is an object used to configure compiler behavior in Vue 3. It belongs to the configuration object (`config`) of the Vue application instance (`app`), specifically designed to control template compilation behavior. By setting these options, developers can adjust the Vue compiler's behavior to meet specific requirements. * * * ## Common Configuration Options Here are some commonly used configuration options in `app.config.compilerOptions`: ### 1. `isCustomElement` * **Purpose**: Used to specify which elements should be treated as custom elements (rather than Vue components). * **Applicable Scenarios**: When you use third-party custom elements (such as Web Components) in templates, you need to mark them as custom elements to prevent the Vue compiler from treating them as unknown Vue components. * **Example**: ## Example app.config.compilerOptions.isCustomElement=(tag)=> tag.startsWith('my-'); The above code will treat all tags starting with `my-` as custom elements. ### 2. `whitespace` * **Purpose**: Controls how whitespace characters in templates are handled. * **Optional Values**: * `'preserve'`: Preserve all whitespace characters. * `'condense'`: Compress whitespace characters to a single space. * `'collapse'`: Remove all redundant whitespace characters. * **Example**: ## Example app.config.compilerOptions.whitespace='condense'; The above code will compress whitespace characters in templates to a single space. ##```