Jest: TypeError: replaceAll is not a function

String.prototype.replaceAll() is a useful method and while building and executing everything works fine. However, all Jest-tests fail with the following error:

TypeError: replaceAll is not a function

These are my dependencies:

"dependencies": {
  "core-js": "^3.6.5",
  "vue": "^2.6.11",
  "vue-class-component": "^7.2.3",
  "vue-i18n": "^8.22.0",
  "vue-property-decorator": "^8.4.2",
  "vue-router": "^3.3.4",
  "vuex": "^3.5.1"
"devDependencies": {
  "@vue/test-utils": "^1.1.0",
  "jest-junit": "^12.0.0",
  "ts-jest": "^26.4.1",
  "typescript": "~3.9.3",
  "vue-jest": "^3.0.7",
  "vue-template-compiler": "^2.6.10"

How can I fix this behavior?

68 thoughts on “Jest: TypeError: replaceAll is not a function”

  1. This most likely happens because String.prototype.replaceAll is not implemented in Node.js (at least as of version v14.15.0).

    One alternative you could use are regular expressions like in this example:

    const str = 'foo-foo';
    const regex = /foo/g; // Note the 'g' flag, which matches all occurrences of the expression
    console.log(str.replace(regex, 'bar')); // 'bar-bar'

    You can check here for more info on regular expressions.

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