Remove support for Node 18

Author: webmaster128

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
   test:
     strategy:
       matrix:
-        node-version: ["18", "20", "22", "24"]
+        node-version: ["20", "22", "24"]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to
 
 ### Changed
 
+- all: Drop support for Node.js < 20.
 - @cosmjs/cli: package got removed with no replacement
 
 ## [0.34.0] - 2025-07-11

HACKING.md

@@ -6,7 +6,7 @@ work on CosmJS, i.e. modify it. It is not intended for users of CosmJS.
 ## Prerequisite
 
 - A UNIX-like development environment
-- Node.js 18+, Docker and yarn
+- Node.js 20+, Docker and yarn
 - `sha256sum`, which you
   [can get on macOS as well](https://unix.stackexchange.com/questions/426837/no-sha256sum-in-macos)
 - `gsed`, which you

README.md

@@ -83,7 +83,7 @@ optipng docs/cosmjs-tree*.png
 
 Currently the codebase supports the following runtime environments:
 
-1. Node.js 18+
+1. Node.js 20+
 2. Modern browsers (Chromium/Firefox/Safari, no Internet Explorer or
    [Edge Spartan](https://en.wikipedia.org/wiki/Microsoft_Edge#Development))
 3. Browser extensions (Chromium/Firefox)