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

TS1127

Invalid character.

The source contains a character that cannot appear there, such as a stray symbol or an escape that produces an invalid identifier character.

What it means

The lexer found a character that isn't valid in TypeScript source at that position. Common causes are characters pasted from documents (smart quotes, symbols) and \u escapes inside an identifier that produce a character identifiers can't contain, such as a space.

Example

index.ts
const x\u0020y = 1;
export {};
ts-r-check -p tsconfig.json --pretty false ts-r output
index.ts(1,8): error TS1127: Invalid character.

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

  • Delete or replace the character; retype quotes and operators by hand if the code was pasted.
  • Inside identifiers, only use escapes for letters, digits, $ and _.