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Minify content within script tag of type JSON (importmap, manifest, JSON-LD, etc.) #1157

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Minify content within script tag of type JSON (importmap, manifest, JSON-LD, etc.) #1157

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ab4c9d6
Minify content within script tag of type="application/ld+json"
simonewebdesign Dec 1, 2024
f63fdbd
Log the error
simonewebdesign Jan 11, 2025
25e77e8
Add support for `importmap` and other JSON types
simonewebdesign Feb 13, 2025
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24 changes: 24 additions & 0 deletions src/htmlminifier.js
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Original file line number Diff line number Diff line change
Expand Up @@ -385,8 +385,22 @@ function cleanConditionalComment(comment, options) {
}) : comment;
}

var JSON_SCRIPT_TYPES = [
'application/json',
'application/ld+json',
'application/manifest+json',
'application/vnd.geo+json',
'importmap',
'speculationrules',
];

function processScript(text, options, currentAttrs) {
for (var i = 0, len = currentAttrs.length; i < len; i++) {
if (currentAttrs[i].name.toLowerCase() === 'type' &&
JSON_SCRIPT_TYPES.indexOf(currentAttrs[i].value) > -1) {
return minifyJson(text, options);
}

if (currentAttrs[i].name.toLowerCase() === 'type' &&
options.processScripts.indexOf(currentAttrs[i].value) > -1) {
return minify(text, options);
Expand All @@ -395,6 +409,16 @@ function processScript(text, options, currentAttrs) {
return text;
}

function minifyJson(text, options) {
try {
return JSON.stringify(JSON.parse(text));
}
catch (err) {
options.log(err);
return text;
}
}

// Tag omission rules from https://html.spec.whatwg.org/multipage/syntax.html#optional-tags
// with the following deviations:
// - retain <body> if followed by <noscript>
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27 changes: 27 additions & 0 deletions tests/minifier.js
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Expand Up @@ -2822,6 +2822,33 @@ QUnit.test('processScripts', function(assert) {
}), output);
});

QUnit.test('processScripts application/ld+json', function(assert) {
var input = '<script type="application/ld+json">{"foo": "bar"}\n\n</script>';
var output = '<script type="application/ld+json">{"foo":"bar"}</script>';
assert.equal(minify(input, {
collapseWhitespace: true,
processScripts: ['application/ld+json']
}), output);
});

QUnit.test('processScripts application/ld+json (invalid/malformed)', function(assert) {
var input = '<script type="application/ld+json">{"foo: "bar"}\n\n</script>';
var output = '<script type="application/ld+json">{"foo: "bar"}</script>';
assert.equal(minify(input, {
collapseWhitespace: true,
processScripts: ['application/ld+json']
}), output);
});

QUnit.test('processScripts importmap', function(assert) {
var input = '<script type="importmap">\n{\n "imports": {\n "lodash": "/js/lodash.js",\n "vue": "https://cdn.jsdelivr.net/npm/vue@3/dist/vue.esm-browser.js"\n }\n}\n</script>';
var output = '<script type="importmap">{"imports":{"lodash":"/js/lodash.js","vue":"https://cdn.jsdelivr.net/npm/vue@3/dist/vue.esm-browser.js"}}</script>';
assert.equal(minify(input, {
collapseWhitespace: true,
processScripts: ['importmap']
}), output);
});

QUnit.test('ignore', function(assert) {
var input, output;

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