Tips for resolving the "unsafe-eval" issue in Vue3 on the client-side platform

My app is built using Express, cors, and helmet. I have incorporated Vue3 on the client-side only, with the library file being self-hosted in the public folder. To add the module to the client-side, I simply include the following script:

<script type="module" src="/public/lib/vue.esm-browser.js"></script>

The issue I am facing is that when I try to use it, I keep getting an 

Uncaught EvalError: Refused to evaluate a string as JavaScript because 'unsafe-eval' is not an allowed source of script in the following Content Security Policy directive: "script-src 'self'"
. This problem emerged suddenly yesterday, coinciding with my implementation of the helmet and cors modules. Even after commenting out these modules, the error persists. What steps should I take to resolve this?

javascriptexpressvuejs3content-security-policy

Answer №1

Indeed, Vue.js incorporates a segment of code similar to this:

// examining potential CSP limitation
try {
  new Function('return 1')
} catch (e: any) {
  if (e.toString().match(/unsafe-eval|CSP/)) {
    warn(
      'It appears that the standalone build of Vue.js is being utilized in an environment with Content Security Policy restrictions that forbid unsafe-eval. ' +
      'The template compiler cannot operate under such circumstances. Consider adjusting the policy to permit unsafe-eval or pre-compile your templates into render functions.'
    )
  }
}

There are two possible approaches:

  1. Implementing precompiled templates, view conversation on GitHub.

  2. Employing the vue.runtime.js runtime version instead of the full version vue.js.

VueJS offers two distinct versions: the full version and the runtime version. 'unsafe-eval' is solely required for the full VueJS version; the runtime variant does not necessitate it. Further information can be found here.

The runtime-only distribution is completely compliant with CSP regulations. By utilizing the runtime-only package along with Webpack + vue-loader or Browserify + vueify, your templates will be precompiled into render functions which function flawlessly within CSP setups. Refer to details in Vue CSP environments.

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