This is an example of building TDLib for browsers using Emscripten. These scripts build TDLib and create an NPM package tdweb. You need a Unix shell with sed, tar and wget utilities to run the provided scripts.

Building tdweb NPM package

Install the latest emsdk. Do not use the system-provided emscripten package, because it contains a version that is too old.
Install all TDLib build dependencies as described in Building.
Run source ./emsdk_env.sh from emsdk directory to set up the correct build environment.
On macOS, install the coreutils Homebrew package and replace realpath in scripts with grealpath:

brew install coreutils
sed -i.bak 's/[(]realpath/(grealpath/g' build-tdlib.sh

Run build scripts in the following order:

cd <path to TDLib sources>/example/web
./build-openssl.sh
./build-tdlib.sh
./copy-tdlib.sh
./build-tdweb.sh

The built package is now located in the tdweb directory.

Using tdweb NPM package

See tdweb or README.md for package documentation.