Added preprocess option

src/preprocess.js

@@ -25,6 +25,9 @@ const find_contextual_names = (compiler, node) => {
 // extract scripts to lint from component definition
 export const preprocess = text => {
 	const compiler = processor_options.custom_compiler || default_compiler || (default_compiler = require('svelte/compiler'));
+	if (processor_options.preprocess) {
+		text = processor_options.preprocess(text)
+	}
 	if (processor_options.ignore_styles) {
 		// wipe the appropriate <style> tags in the file
 		text = text.replace(/<style(\s[^]*?)?>[^]*?<\/style>/gi, (match, attributes = '') => {

src/processor_options.js

@@ -12,6 +12,7 @@ const { verify } = Linter.prototype;
 Linter.prototype.verify = function(code, config, options) {
 	// fetch settings
 	const settings = config && (typeof config.extractConfig === 'function' ? config.extractConfig(options.filename) : config).settings || {};
+	processor_options.preprocess = settings['svelte3/preprocess'];
 	processor_options.custom_compiler = settings['svelte3/compiler'];
 	processor_options.ignore_warnings = settings['svelte3/ignore-warnings'];
 	processor_options.ignore_styles = settings['svelte3/ignore-styles'];

test/samples/preprocess/.eslintrc.js

@@ -0,0 +1,7 @@
+module.exports = {
+	settings: {
+		'svelte3/preprocess': text => {
+			return text.replace(/custom-style-tag/g, 'style')
+		},
+	},
+};

test/samples/preprocess/Input.svelte

@@ -0,0 +1,7 @@
+<div></div>
+
+<custom-style-tag>
+	div {
+		background: black;
+	}
+</custom-style-tag>

test/samples/preprocess/expected.json

@@ -0,0 +1 @@
+[]