Can I use
?

BigInt

- OTHER

Arbitrary-precision integers in JavaScript.

Chrome

  1. 4 - 66: Not supported
  2. 67 - 123: Supported
  3. 124: Supported
  4. 125 - 127: Supported

Edge

  1. 12 - 18: Not supported
  2. 79 - 122: Supported
  3. 123: Supported

Safari

  1. 3.1 - 13.1: Not supported
  2. 14 - 17.3: Supported
  3. 17.4: Supported
  4. 17.5 - TP: Supported

Firefox

  1. 2 - 64: Not supported
  2. 65 - 67: Disabled by default
  3. 68 - 124: Supported
  4. 125: Supported
  5. 126 - 128: Supported

Opera

  1. 9 - 53: Not supported
  2. 54 - 108: Supported
  3. 109: Supported

IE

  1. 5.5 - 10: Not supported
  2. 11: Not supported

Chrome for Android

  1. 123: Supported

Safari on iOS

  1. 3.2 - 13.7: Not supported
  2. 14 - 17.3: Supported
  3. 17.4: Supported
  4. 17.5: Supported

Samsung Internet

  1. 4 - 8.2: Not supported
  2. 9.2 - 23: Supported
  3. 24: Supported

Opera Mini

  1. all: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 80: Supported

UC Browser for Android

  1. 15.5: Supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 123: Supported

Firefox for Android

  1. 124: Supported

QQ Browser

  1. 14.9: Supported

Baidu Browser

  1. 13.52: Supported

KaiOS Browser

  1. 2.5: Not supported
  2. 3: Supported
Resources:
Blog article from Dr. Axel Rauschmayer
Firefox implementation bug
MDN Web Docs
Blog article from Google Developer
GitHub repository