** Transform an attribute string into a key-value object */Īcc = value ? value.replace( //g, '') : true const preprocess = Ĭonst = templateMatch Svelte’s preprocess method expects an object or an array of objects with one or more of markup, script, and style properties, each being a function receiving the source code as an argument. With svelte.preprocess you have a great deal of flexibility in how you write your components while ensuring that the Svelte compiler receives a plain component. To enable this Svelte provides a preprocess method allowing you to transform different parts of the component before it reaches the compiler. To use compile-to-js or compile-to-css languages, you need to make sure that any non-standard syntax is transformed before Svelte tries to parse it. The Svelte compiler expects all components it receives to be valid Svelte syntax. The bundler plugin gives you easy access to it, so you don’t need to transform your components before compilation manually.

This preprocess option calls svelte.preprocess internally. This article references svelte.preprocess throughout but you may be more familiar with the preprocess option of svelte-loader or rollup-plugin-svelte.

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