TS2304: 'Omit' is a mysterious being that cannot be located

Encountered an issue while compiling my Angular project. This is a project that has remained unchanged for some time and is built daily by Jenkins. However, today it started failing and I'm struggling to determine the cause.

ERROR in [at-loader] ./node_modules/@types/estree/index.d.ts:107:38 TS2304: Cannot find name 'Omit'.

The dependencies listed in my package.json are as follows:

"dependencies": {
    "@angular/animations": "^7.2.6",
    "@angular/cdk": "^7.3.3",
    "@angular/compiler": "^7.2.6",
    "@angular/compiler-cli": "7.2.6",
    "@angular/core": "^7.2.6",
    ...

tslint.json

{
  "rules": {
    "class-name": true,
    "comment-format": [
      false,
      "check-space"
    ],
    "curly": true,
    "eofline": false,
    "forin": true,
    ...

Any suggestions or insights on how to resolve this issue would be greatly appreciated.

Thank you

angulartypescript

Answer №1

After much investigation, I have pinpointed the troublesome dependency.

The culprit turned out to be "rollup": "^1.2.2",

This particular version was including estree types that were recently updated (refer to earlier comments on my question) to utilize the Omit type. Unfortunately, since I am using an outdated version of Typescript that lacks this type, it caused compilation errors.

To quickly solve this issue, I replaced "^1.2.2" with "~1.2.2" to only allow future patch updates and resolve the problem.

To identify the root cause, I utilized the following command:

npm ls @types/estree, which reveals the "parent" dependency responsible for adding it.

Thank you.

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