110 lines
No EOL
3.3 KiB
JavaScript
Executable file
110 lines
No EOL
3.3 KiB
JavaScript
Executable file
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = removeRedundantAttributes;
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exports.redundantScriptTypes = void 0;
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// https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types#JavaScript_types
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const redundantScriptTypes = new Set(['application/javascript', 'application/ecmascript', 'application/x-ecmascript', 'application/x-javascript', 'text/javascript', 'text/ecmascript', 'text/javascript1.0', 'text/javascript1.1', 'text/javascript1.2', 'text/javascript1.3', 'text/javascript1.4', 'text/javascript1.5', 'text/jscript', 'text/livescript', 'text/x-ecmascript', 'text/x-javascript']);
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exports.redundantScriptTypes = redundantScriptTypes;
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const redundantAttributes = {
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'form': {
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'method': 'get'
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},
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'input': {
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'type': 'text'
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},
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'button': {
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'type': 'submit'
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},
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'script': {
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'language': 'javascript',
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'type': node => {
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for (const [attrName, attrValue] of Object.entries(node.attrs)) {
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if (attrName.toLowerCase() !== 'type') {
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continue;
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}
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return redundantScriptTypes.has(attrValue);
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}
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return false;
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},
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// Remove attribute if the function returns false
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'charset': node => {
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// The charset attribute only really makes sense on “external” SCRIPT elements:
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// http://perfectionkills.com/optimizing-html/#8_script_charset
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return node.attrs && !node.attrs.src;
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}
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},
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'style': {
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'media': 'all',
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'type': 'text/css'
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},
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'link': {
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'media': 'all',
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'type': node => {
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// https://html.spec.whatwg.org/multipage/links.html#link-type-stylesheet
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let isRelStyleSheet = false;
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let isTypeTextCSS = false;
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if (node.attrs) {
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for (const [attrName, attrValue] of Object.entries(node.attrs)) {
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if (attrName.toLowerCase() === 'rel' && attrValue === 'stylesheet') {
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isRelStyleSheet = true;
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}
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if (attrName.toLowerCase() === 'type' && attrValue === 'text/css') {
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isTypeTextCSS = true;
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}
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}
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} // Only "text/css" is redudant for link[rel=stylesheet]. Otherwise "type" shouldn't be removed
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return isRelStyleSheet && isTypeTextCSS;
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}
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},
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// See: https://html.spec.whatwg.org/#lazy-loading-attributes
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'img': {
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'loading': 'eager'
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},
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'iframe': {
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'loading': 'eager'
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}
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};
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const tagsHaveRedundantAttributes = new Set(Object.keys(redundantAttributes));
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/** Removes redundant attributes */
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function removeRedundantAttributes(tree) {
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tree.walk(node => {
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if (!node.tag) {
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return node;
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}
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if (!tagsHaveRedundantAttributes.has(node.tag)) {
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return node;
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}
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const tagRedundantAttributes = redundantAttributes[node.tag];
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node.attrs = node.attrs || {};
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for (const redundantAttributeName of Object.keys(tagRedundantAttributes)) {
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let tagRedundantAttributeValue = tagRedundantAttributes[redundantAttributeName];
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let isRemove = false;
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if (typeof tagRedundantAttributeValue === 'function') {
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isRemove = tagRedundantAttributeValue(node);
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} else if (node.attrs[redundantAttributeName] === tagRedundantAttributeValue) {
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isRemove = true;
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}
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if (isRemove) {
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delete node.attrs[redundantAttributeName];
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}
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}
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return node;
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});
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return tree;
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} |