Why Does Firefox Not Support ES2015 Imports?
Published on 2024-11-07
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Can ES2015 Import Work in Firefox?
Despite placing your import statement at the top level of your t1.js file, you encounter the error: "SyntaxError: import declarations may only appear at top level of a module." This suggests that Firefox may not be fully supporting ES2015 import functionality.
Understanding the Correct Top-Level Requirement
While your import statement is located at the beginning of t1.js, it is crucial to note that the file itself must explicitly indicate that it's loaded as a module. Simply placing the import statement at the top of a non-module file will not suffice.
How to Enable Module Loading in Firefox
To resolve the issue, you need to add the "type" attribute to your script tag, specifying that it's a module:
Browser Compatibility
ES2015 import/export functionality is currently fully supported in the following browser versions and later (check caniuse.com for the most up-to-date list):
- Firefox 60
- Chrome (desktop) 65
- Chrome (Android) 66
- Safari 11
Enabling Module Support in Older Browsers
For older browser versions, you may need to enable certain flags:
- Chrome Canary 60: "Experimental Web Platform" flag
- Firefox 54: "dom.moduleScripts.enabled" setting
- Edge 15: "Experimental JavaScript Features" flag
Release Statement
This article is reprinted at: 1729594878 If there is any infringement, please contact [email protected] to delete it
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