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kulshekhar / ts-jest

A Jest transformer with source map support that lets you use Jest to test projects written in TypeScript.
https://kulshekhar.github.io/ts-jest
MIT License
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import "regenerator-runtime/runtime"; SyntaxError: Unexpected string #922

Closed serratedserenade closed 5 years ago

serratedserenade commented 5 years ago

Issue :

Getting an unexpected string error as shown:

 FAIL  tests/unit/components/client-management/EditClient.spec.ts
  ● Test suite failed to run
    /home/adcruz/Documents/project/admin-portal/src/components/client-management/EditClient.vue:2
    import "regenerator-runtime/runtime";
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    SyntaxError: Unexpected string
      1 | import { shallowMount, Wrapper } from '@vue/test-utils';
      2 | import Vue from 'vue';
    > 3 | import EditClient from '@/components/client-management/EditClient.vue';
        | ^
      4 | import Vuetify from 'vuetify';
      5 |
      6 | describe('EditClient.vue Rendering', () => {
      at ScriptTransformer._transformAndBuildScript (node_modules/jest-runtime/build/script_transformer.js:403:17)
      at Object.<anonymous> (tests/unit/components/client-management/EditClient.spec.ts:3:1)

## Expected behavior <!-- describe the expected behavior below -->:
Test to succeed

## Debug log:
<details/>
<summary>log file content<!-- You can activate the debug logger by setting the environment variable TS_JEST_LOG="ts-jest.log" before running tests. The output of the logger will be in **ts-jest.log** in CWD, paste it in the below section: --></summary>

Package.json
```json
"dependencies": {
    "axios": "^0.18.0",
    "luxon": "^1.6.2",
    "vue": "^2.5.17",
    "vue-class-component": "^6.0.0",
    "vue-property-decorator": "^7.0.0",
    "vue-router": "^3.0.1",
    "vuetify": "^1.3.0",
    "vuex": "^3.0.1"
  },
  "devDependencies": {
    "@commitlint/cli": "^7.2.1",
    "@commitlint/config-conventional": "^7.1.2",
    "@project/ts": "^0.5.0",
    "@types/jest": "^23.1.4",
    "@types/luxon": "^1.4.1",
    "@vue/cli-plugin-babel": "^3.0.0",
    "@vue/cli-plugin-typescript": "^3.0.0",
    "@vue/cli-plugin-unit-jest": "^3.0.0",
    "@vue/cli-service": "^3.0.0",
    "@vue/test-utils": "^1.0.0-beta.20",
    "babel-core": "7.0.0-bridge.0",
    "enquirer": "^2.0.6",
    "husky": "^1.1.4",
    "stylus": "^0.54.5",
    "stylus-loader": "^3.0.1",
    "ts-jest": "^23.0.0",
    "typescript": "^3.0.0",
    "vue-cli-plugin-styleguidist": "^0.1.9",
    "vue-cli-plugin-vuetify": "^0.4.5",
    "vue-template-compiler": "^2.5.17",
    "vuetify-loader": "^1.0.5"
  },
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daividh commented 5 years ago

Same problem here. Have you found a solution ?

serratedserenade commented 5 years ago

Same problem here. Have you found a solution ?

So, for some reason, the issue was I was using an async function in a .vue file (and this error only showed for this file, no other .vue file). It was declared as a method BUT I never declared a return type, so it looked sort of like:

Before fix:

export default Vue.extends({
...
methods: {
  async someFunction() {
    ...
  }
}
...
})

After fix:
export default Vue.extends({
...
methods: {
  async someFunction(): Promise<void> {
    ...
  }
}
...
})

Still not sure how and why would make it not crash with this error but oh well.