Error: node_modules/@types/d3-dsv/index.d.ts(159,60): error TS1005: ',' expected

Question

To solve an npm error in anular project, delete the node modules in the angular project, reinstall the npm modules and run ng serve, the follwing error occur. How can it be solved?

Error: node_modules/@types/d3-dsv/index.d.ts(159,60): error TS1005: ','expected.
node_modules/@types/d3-dsv/index.d.ts(159,61): error TS1005: ',' expected.
node_modules/@types/d3-dsv/index.d.ts(169,64): error TS1005: ',' expected.
node_modules/@types/d3-dsv/index.d.ts(169,65): error TS1005: ',' expected.
node_modules/@types/d3-dsv/index.d.ts(186,46): error TS1005: ',' expected.
node_modules/@types/d3-dsv/index.d.ts(186,52): error TS1005: ',' expected.
node_modules/@types/d3-dsv/index.d.ts(186,54): error TS1005: ',' expected.
node_modules/@types/d3-dsv/index.d.ts(195,44): error TS1005: ',' expected.
node_modules/@types/d3-dsv/index.d.ts(195,50): error TS1005: ',' expected.
node_modules/@types/d3-dsv/index.d.ts(300,60): error TS1005: ',' expected.
node_modules/@types/d3-dsv/index.d.ts(300,61): error TS1005: ',' expected.
node_modules/@types/d3-dsv/index.d.ts(310,64): error TS1005: ',' expected.
node_modules/@types/d3-dsv/index.d.ts(310,65): error TS1005: ',' expected.

My package.json - devDependencies

`

"devDependencies": {
    "@angular/cli": "^1.7.4",
    "@angular/compiler-cli": "6.1.9",
    "@angular/language-service": "6.1.9",
    "@types/jasmine": "^2.8.16",
    "@types/jasminewd2": "^2.0.6",
    "@types/jquery": "~3.2.16",
    "@types/node": "6.14.10",
    "codelyzer": "^4.5.0",
    "jasmine-core": "~2.8.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~2.0.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^2.1.1",
    "karma-jasmine": "^1.1.2",
    "karma-jasmine-html-reporter": "^0.2.2",
    "karma-sonarqube-unit-reporter": "0.0.23",
    "karma-spec-reporter": "0.0.32",
    "merge-stream": "^1.0.1",
    "protractor": "~5.1.2",
    "requirejs": "^2.3.6",
    "sonar-scanner": "^3.1.0",
    "ts-mockito": "^2.3.0",
    "ts-node": "~4.1.0",
    "tslint": "5.20.1",
    "typescript": "2.9.2"
  }

Answer 1

Please make sure you're using TS of at least 2.8
Check your typescript version using

tsc -v

If it's less than 2.8 upgrade it with following command.

npm install -g typescript@latest

Please let me know if this works.

Answer 2

it's typescript compiler problem. just replace 'let' with 'var' then error disappear. but it is not a proper solution.

Answer 3

I needed to update my d3 types dependency. In my package.json I now use:

    "@types/d3": "^7.1.0",

Then npm install. Previously I was using version 5.7.1, which gave that error.