Failed to collect coverage: ERROR: Unexpected token u in JSON at position 0

[mariangemarcano]

I'm hitting the following issue when running jest with code coverage:

Running coverage on untested files...Failed to collect coverage from components
/AppFooter.vue
ERROR: Unexpected token u in JSON at position 0
STACK: SyntaxError: Unexpected token u in JSON at position 0
at JSON.parse ()
at compileTypescript (src/node_modules/vue-jest/lib/compilers/typescript-compiler.js:67:44)
at processScript (src/node_modules/vue-jest/lib/process.js:22:12)
at Object.module.exports [as process] (src/node_modules/vue-jest/lib/process.js:71:18)
at ScriptTransformer.transformSource (/node_modules/jest-runtime/build/script_transformer.js:229:35)
at exports.default (/node_modules/jest-cli/build/generate_empty_coverage.js:37:5)
at Object.worker (/node_modules/jest-cli/build/reporters/coverage_worker.js:39:291)
at execMethod (/node_modules/jest-worker/build/child.js:92:29)
at process.on (/node_modules/jest-worker/build/child.js:42:7)
at emitTwo (events.js:126:13)

typescript-compiler.js is failing JSON.parse

this is the component

<template>
<footer class="page-footer center-on-small-only">
    <b-container fluid>
    </b-container>
</footer>
</template>

<script lang="ts">
// @ts-ignore
import Component from 'nuxt-class-component'
import Vue from 'vue'

@Component({})
export default class AppFooter extends Vue {
}

[velidan]

Have the same issue

[eddyerburgh]

Is anybody able to post a minimal reproduction repo?

[mariangemarcano]

@eddyerburgh this is an example repo https://github.com/mariangemarcano/nuxt-typescript-jest-example
running npm install and then npm run test hits the issue
it is based on https://github.com/nuxt-community/typescript-template

[mariangemarcano]

Just confirmed the issue is fixed in version https://github.com/vuejs/vue-jest/tree/v2.3.0