wip

webpack/module/rules/collapse-spaces.ts

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+import * as fs from 'fs';
+const minify = require('html-minifier').minify;
+const StringReplacePlugin = require('string-replace-webpack-plugin');
+
+export default () => ({
+	enforce: 'pre',
+	test: /\.vue$/,
+	exclude: /node_modules/,
+	loader: StringReplacePlugin.replace({
+		replacements: [{
+			pattern: /^<template>([\s\S]+?)\r?\n<\/template>/, replacement: html => {
+				return minify(html, {
+					collapseWhitespace: true,
+					collapseInlineTagWhitespace: true,
+					keepClosingSlash: true
+				});
+			}
+		}]
+	})
+});