Intl.NumberFormatOptions options are missing

[nick-korolev]

Bug Report

Hi. According to specification Intl.NumberFormat contains numberingSystem option, but typescript throws the error Object literal may only specify known properties, and 'numberingSystem' does not exist in type 'NumberFormatOptions'

🔎 Search Terms

Intl, NumberFormatOptions

🕗 Version & Regression Information

"typescript": "^4.9.4"

💻 Code

I have a monorepo with this structure

root

• base.tsconfig.json
• package.json
• app1
  • index.ts
  • tsconfig.json
  • package.json

base.tsconfig.json

{
  "compilerOptions": {
    "module": "ESNext",
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "experimentalDecorators": true,
    "target": "ESNext",
    "noImplicitAny": true,
    "strictNullChecks": true,
    "moduleResolution": "node",
    "sourceMap": true,
    "allowJs": true,
    "checkJs": false,
    "lib": [
      "esnext",
      "dom"
    ],
    "resolveJsonModule": true,
    "skipLibCheck": true,
    "emitDecoratorMetadata": true,
    "baseUrl": "."
  }
}

app1/tsconfig.json

{
  "extends": "../base.tsconfig.json",
  "compilerOptions": {
    "module": "ESNext",
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "experimentalDecorators": true,
    "target": "ESNext",
    "noImplicitAny": true,
    "strictNullChecks": true,
    "moduleResolution": "node",
    "sourceMap": true,
    "allowJs": true,
    "checkJs": false,
    "lib": [
      "esnext",
      "dom"
    ],
    "resolveJsonModule": true,
    "skipLibCheck": true,
    "emitDecoratorMetadata": true,
    "baseUrl": "."
  }
}

app1/index.ts

const amount = new Intl.NumberFormat('en-US', {
  style: 'currency',
  currency: 'USD',
  numberingSystem: 'latn'
}).format(1000);

console.log(amount);

🙁 Actual behavior

After type checking typescript throws error

index.ts:4:3 - error TS2345: Argument of type '{ style: string; currency: string; numberingSystem: string; }' is not assignable to parameter of type 'NumberFormatOptions'.
  Object literal may only specify known properties, and 'numberingSystem' does not exist in type 'NumberFormatOptions'.

4   numberingSystem: 'latn'
    ~~~~~~~~~~~~~~~~~~~~~~~


Found 1 error in index.ts:4

🙂 Expected behavior

The typescript correctly checks the types that are specified in the specification

[sirbrillig]

I just ran into this issue myself. Weirdly it's not available in the es2020 definition of ResolvedNumberFormatOptions, even though it is present in the es5 types. It's hard for me to tell when it was added to JS, but for a similar property in Intl.Locale caniuse suggests that it is pretty well supported.

[tiagofilipenunes]

Following up on this, according to the specification, roundingMode should also be available, but typescript is throwing an error:

Object literal may only specify known properties, and 'roundingMode' does not exist in type 'NumberFormatOptions'.

Caniuse is showing it is widely available as well.

Multiple other options are missing as mentioned in #43336