require-ing a json file breaks vitest #9822

Closed
Bug
#11917
Closed
require-ing a json file breaks vitest#9822
Bug
#11917
Labels
package:vitestRelating to the Workers Vitest integration

Description

@threepointone
threepointone
opened on Jul 2, 2025

What versions & operating system are you using?

wrangler@4.22.0, @cloudflare/vitest-pool-workers

Please provide a link to a minimal reproduction

https://github.com/threepointone/test-vitest-workers-json-require

Describe the Bug

A require of a JSON file (NOT an import) will fail to run with @cloudflare/vitest-pool-workers, with a cryptic error message SyntaxError: Unexpected token ':'.

Why is this important? Sure, developers might use import to import JSON files, but third party dependencies (like the very popular ajv) do cjs builds, which end up requireing JSON files.

(like here: https://unpkg.com/ajv@8.17.1/dist/core.js)

This works when we do wrangler dev or vite dev, but fails when we run vitest.

Repro

npm install && npm test

Either we should make it work with vitest/vitest-pool-workers, or we should have a better error.

Workaround:

add it to the deps section of vitest.config.ts

Please provide any relevant error logs

No response

Metadata

Metadata

Assignees

No one assigned

    Labels

    package:vitestRelating to the Workers Vitest integration

    Type

    Bug

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    None yet

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    , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
     blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
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addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

    Skip to content
    require-ing a json file breaks vitest #9822
    Closed
    Bug
    #11917
    Closed
    require-ing a json file breaks vitest#9822
    Bug
    #11917
    Labels
    package:vitestRelating to the Workers Vitest integration
    Description
    @threepointone
    threepointone
    opened on Jul 2, 2025
    What versions & operating system are you using?
    wrangler@4.22.0, @cloudflare/vitest-pool-workers
    Please provide a link to a minimal reproduction
    https://github.com/threepointone/test-vitest-workers-json-require
    Describe the Bug
    A require of a JSON file (NOT an import) will fail to run with @cloudflare/vitest-pool-workers, with a cryptic error message SyntaxError: Unexpected token ':'.
    Why is this important? Sure, developers might use import to import JSON files, but third party dependencies (like the very popular ajv) do cjs builds, which end up requireing JSON files.
    (like here: https://unpkg.com/ajv@8.17.1/dist/core.js)
    This works when we do wrangler dev or vite dev, but fails when we run vitest.
    Repro
    npm install && npm test
    Either we should make it work with vitest/vitest-pool-workers, or we should have a better error.
    Workaround:
    add it to the deps section of vitest.config.ts
    Please provide any relevant error logs
    No response
    Metadata
    Metadata
    Assignees
    No one assigned
      Labels
      package:vitestRelating to the Workers Vitest integration
      Type
      Bug
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      Milestone
      No milestone
      Relationships
      None yet
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      No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

      Skip to content
      require-ing a json file breaks vitest #9822
      Closed
      Bug
      #11917
      Closed
      require-ing a json file breaks vitest#9822
      Bug
      #11917
      Labels
      package:vitestRelating to the Workers Vitest integration
      Description
      @threepointone
      threepointone
      opened on Jul 2, 2025
      What versions & operating system are you using?
      wrangler@4.22.0, @cloudflare/vitest-pool-workers
      Please provide a link to a minimal reproduction
      https://github.com/threepointone/test-vitest-workers-json-require
      Describe the Bug
      A require of a JSON file (NOT an import) will fail to run with @cloudflare/vitest-pool-workers, with a cryptic error message SyntaxError: Unexpected token ':'.
      Why is this important? Sure, developers might use import to import JSON files, but third party dependencies (like the very popular ajv) do cjs builds, which end up requireing JSON files.
      (like here: https://unpkg.com/ajv@8.17.1/dist/core.js)
      This works when we do wrangler dev or vite dev, but fails when we run vitest.
      Repro
      npm install && npm test
      Either we should make it work with vitest/vitest-pool-workers, or we should have a better error.
      Workaround:
      add it to the deps section of vitest.config.ts
      Please provide any relevant error logs
      No response
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        package:vitestRelating to the Workers Vitest integration
        Type
        Bug
        Projects
        Milestone
        No milestone
        Relationships
        None yet
        Development
        No branches or pull requests
        Issue actions
        
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

        Skip to content
        require-ing a json file breaks vitest #9822
        Closed
        Bug
        #11917
        Closed
        require-ing a json file breaks vitest#9822
        Bug
        #11917
        Labels
        package:vitestRelating to the Workers Vitest integration
        Description
        @threepointone
        threepointone
        opened on Jul 2, 2025
        What versions & operating system are you using?
        wrangler@4.22.0, @cloudflare/vitest-pool-workers
        Please provide a link to a minimal reproduction
        https://github.com/threepointone/test-vitest-workers-json-require
        Describe the Bug
        A require of a JSON file (NOT an import) will fail to run with @cloudflare/vitest-pool-workers, with a cryptic error message SyntaxError: Unexpected token ':'.
        Why is this important? Sure, developers might use import to import JSON files, but third party dependencies (like the very popular ajv) do cjs builds, which end up requireing JSON files.
        (like here: https://unpkg.com/ajv@8.17.1/dist/core.js)
        This works when we do wrangler dev or vite dev, but fails when we run vitest.
        Repro
        npm install && npm test
        Either we should make it work with vitest/vitest-pool-workers, or we should have a better error.
        Workaround:
        add it to the deps section of vitest.config.ts
        Please provide any relevant error logs
        No response
        Metadata
        Metadata
        Assignees
        No one assigned
          Labels
          package:vitestRelating to the Workers Vitest integration
          Type
          Bug
          Projects
          Milestone
          No milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
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cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

          Skip to content
          require-ing a json file breaks vitest #9822
          Closed
          Bug
          #11917
          Closed
          require-ing a json file breaks vitest#9822
          Bug
          #11917
          Labels
          package:vitestRelating to the Workers Vitest integration
          Description
          @threepointone
          threepointone
          opened on Jul 2, 2025
          What versions & operating system are you using?
          wrangler@4.22.0, @cloudflare/vitest-pool-workers
          Please provide a link to a minimal reproduction
          https://github.com/threepointone/test-vitest-workers-json-require
          Describe the Bug
          A require of a JSON file (NOT an import) will fail to run with @cloudflare/vitest-pool-workers, with a cryptic error message SyntaxError: Unexpected token ':'.
          Why is this important? Sure, developers might use import to import JSON files, but third party dependencies (like the very popular ajv) do cjs builds, which end up requireing JSON files.
          (like here: https://unpkg.com/ajv@8.17.1/dist/core.js)
          This works when we do wrangler dev or vite dev, but fails when we run vitest.
          Repro
          npm install && npm test
          Either we should make it work with vitest/vitest-pool-workers, or we should have a better error.
          Workaround:
          add it to the deps section of vitest.config.ts
          Please provide any relevant error logs
          No response
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            package:vitestRelating to the Workers Vitest integration
            Type
            Bug
            Projects
            Milestone
            No milestone
            Relationships
            None yet
            Development
            No branches or pull requests
            Issue actions
            
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

            Skip to content
            require-ing a json file breaks vitest #9822
            Closed
            Bug
            #11917
            Closed
            require-ing a json file breaks vitest#9822
            Bug
            #11917
            Labels
            package:vitestRelating to the Workers Vitest integration
            Description
            @threepointone
            threepointone
            opened on Jul 2, 2025
            What versions & operating system are you using?
            wrangler@4.22.0, @cloudflare/vitest-pool-workers
            Please provide a link to a minimal reproduction
            https://github.com/threepointone/test-vitest-workers-json-require
            Describe the Bug
            A require of a JSON file (NOT an import) will fail to run with @cloudflare/vitest-pool-workers, with a cryptic error message SyntaxError: Unexpected token ':'.
            Why is this important? Sure, developers might use import to import JSON files, but third party dependencies (like the very popular ajv) do cjs builds, which end up requireing JSON files.
            (like here: https://unpkg.com/ajv@8.17.1/dist/core.js)
            This works when we do wrangler dev or vite dev, but fails when we run vitest.
            Repro
            npm install && npm test
            Either we should make it work with vitest/vitest-pool-workers, or we should have a better error.
            Workaround:
            add it to the deps section of vitest.config.ts
            Please provide any relevant error logs
            No response
            Metadata
            Metadata
            Assignees
            No one assigned
              Labels
              package:vitestRelating to the Workers Vitest integration
              Type
              Bug
              Projects
              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              require-ing a json file breaks vitest #9822
              Closed
              Bug
              #11917
              Closed
              require-ing a json file breaks vitest#9822
              Bug
              #11917
              Labels
              package:vitestRelating to the Workers Vitest integration
              Description
              @threepointone
              threepointone
              opened on Jul 2, 2025
              What versions & operating system are you using?
              wrangler@4.22.0, @cloudflare/vitest-pool-workers
              Please provide a link to a minimal reproduction
              https://github.com/threepointone/test-vitest-workers-json-require
              Describe the Bug
              A require of a JSON file (NOT an import) will fail to run with @cloudflare/vitest-pool-workers, with a cryptic error message SyntaxError: Unexpected token ':'.
              Why is this important? Sure, developers might use import to import JSON files, but third party dependencies (like the very popular ajv) do cjs builds, which end up requireing JSON files.
              (like here: https://unpkg.com/ajv@8.17.1/dist/core.js)
              This works when we do wrangler dev or vite dev, but fails when we run vitest.
              Repro
              npm install && npm test
              Either we should make it work with vitest/vitest-pool-workers, or we should have a better error.
              Workaround:
              add it to the deps section of vitest.config.ts
              Please provide any relevant error logs
              No response
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                package:vitestRelating to the Workers Vitest integration
                Type
                Bug
                Projects
                Milestone
                No milestone
                Relationships
                None yet
                Development
                No branches or pull requests
                Issue actions
                
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                Skip to content
                require-ing a json file breaks vitest #9822
                Closed
                Bug
                #11917
                Closed
                require-ing a json file breaks vitest#9822
                Bug
                #11917
                Labels
                package:vitestRelating to the Workers Vitest integration
                Description
                @threepointone
                threepointone
                opened on Jul 2, 2025
                What versions & operating system are you using?
                wrangler@4.22.0, @cloudflare/vitest-pool-workers
                Please provide a link to a minimal reproduction
                https://github.com/threepointone/test-vitest-workers-json-require
                Describe the Bug
                A require of a JSON file (NOT an import) will fail to run with @cloudflare/vitest-pool-workers, with a cryptic error message SyntaxError: Unexpected token ':'.
                Why is this important? Sure, developers might use import to import JSON files, but third party dependencies (like the very popular ajv) do cjs builds, which end up requireing JSON files.
                (like here: https://unpkg.com/ajv@8.17.1/dist/core.js)
                This works when we do wrangler dev or vite dev, but fails when we run vitest.
                Repro
                npm install && npm test
                Either we should make it work with vitest/vitest-pool-workers, or we should have a better error.
                Workaround:
                add it to the deps section of vitest.config.ts
                Please provide any relevant error logs
                No response
                Metadata
                Metadata
                Assignees
                No one assigned
                  Labels
                  package:vitestRelating to the Workers Vitest integration
                  Type
                  Bug
                  Projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions