ts-r
  • Error
  • Reported by the lexer and parser

TS6189

Multiple consecutive numeric separators are not permitted.

A number has two underscores in a row, like `1__000`. Use a single `_` between digit groups.

What it means

Numeric separators must be single underscores between digits. Two or more in a row are a syntax error, reported by ts-r's lexer.

Example

index.ts
export const big = 1__000;
ts-r-check -p tsconfig.json --pretty false ts-r output
index.ts(1,22): error TS6189: Multiple consecutive numeric separators are not permitted.

Recorded by node scripts/verify-examples.mjs with ts-r built from commit 6deaf01. The example uses the default tsconfig: strict, target: es2022, module: esnext, moduleResolution: bundler.

How to fix

  • Use one underscore: 1_000.