spiegel-keyman/common/predictive-text/README.md

Language Modelling Layer (LMLayer)

Provide predictions and corrections while you type!

See Worker Communication Protocol for a semi-formal specification on how the Worker and the main thread communicate.

System dependencies

You will need Bash and Node.js >= 10.0.

Build

Run build.sh. This will also automatically install dependencies with npm.

./build.sh

Two-stage compilation process

Since the primary LMLayer code runs within a Web Worker, build.sh compiles the LMLayer in two stages:

1. Compile the inner worker code

   1. Compile the TypeScript sources for only the Worker code.
   2. Wrap the Worker code as embedded_worker.js

2. Compile the top-level code

   1. Include embedded_worker.js verbatim using a TypeScript directive.
   2. Compile the top-level TypeScript code.
   3. Unwrap the Worker code at runtime.

Test

This will run both headless unit tests, and in-browser unit tests and integration tests:

./build.sh -test

Test-Driven Development

I like to use entr to automatically build and re-run the unit tests anytime I change a source code file. Here's the command I run in separate window:

git ls-files | entr -c ./build.sh -tdd

Importantly, ./build.sh -tdd skips running the in-browser tests, and skips downloading/updating npm dependencies.