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const e = require('estree-builder');
const {generate} = require('escodegen');

generate(e.json({'foo': -1}));

Error: Numeric literal whose value is negative
    at generateNumber (...node_modules/escodegen/escodegen.js:270:19)

{
  "type": "ObjectExpression",
  "properties": [
    {
      "type": "Property",
      "key": {
        "type": "Literal",
        "value": "foo",
        "raw": "\"foo\""
      },
      "computed": false,
      "value": {
        "type": "UnaryExpression",
        "operator": "-",
        "argument": {
          "type": "Literal",
          "value": 1,
          "raw": "1"
        },
        "prefix": true
      },
      "kind": "init",
      "method": false,
      "shorthand": false
    }
  ]
}