TypeScript + node18

Introduction

Following the TypeScript wiki at Node Target Mapping page, we should be able to safely use the base node18 tsconfig.

More specifically, it says

Note: All versions of Node 18 support all ES2023 runtime features, so lib can be safely set to ES2023.

Issue

The trusted source (seems to be) node.green says the opposite (screenshot on 13/01/2025) : Same for the mdn web docs :

And it seems to be correct : this repository show a minimal example through the Array.prototype.toReversed method, using base node18 tsconfig.

Usage

Be sure to use node version 18. Tested with node v18.20.5.

Install dependencies with preferred package manager
Example : npm install
Run build script -- compile TypeScript
Example : npm run build
Run test script -- execute example demonstration
Example : npm run test

Expected result

On line 5 of compiled code, const reversed = arr.toReversed();, it should throw the following TypeError :

TypeError: arr.toReversed is not a function
    at Object.<anonymous> (/redacted/lib/index.js:5:22)
    at Module._compile (node:internal/modules/cjs/loader:1364:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1422:10)
    at Module.load (node:internal/modules/cjs/loader:1203:32)
    at Module._load (node:internal/modules/cjs/loader:1019:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:128:12)
    at node:internal/main/run_main_module:28:49