typocomath/README.md

# typocomath

A final (?) prototype for a refactor of mathjs, culminating the picomath, pocomath, typomath series. Provides an extensible core with "fuzzy" types for its operations, that can at any time generate exact .d.ts file for its current state.

To build and run the prototype, run:

```
pnpm install
pnpm build-and-run
```

## experiment

See: the section under `/src/experiment` and `/src/plugins`.

### The idea

Create a TypeScript plugin which can replace structures like:
 
    infer(factoryFunction)
 
where `factoryFunction` is a mathjs factory function in TypeScript, with something like: 
 
    infer({ signature: factoryFunction })
 
where `signature` is a string containing the type of the factory function and its dependencies.
 
Relevant methods of the TypeScript compiler are: 

```ts
const program = ts.createProgram(fileNames, options)
const typeChecker = program.getTypeChecker()

// relevant methods:
//
//   typeChecker.getSymbolAtLocation
//   typeChecker.getTypeOfSymbolAtLocation
//   typeChecker.getResolvedSignature
//   typeChecker.getSignaturesOfType
```

### Status

None of the experiments (`infer1` and `infer2`) are outputting something useful yet. 


### How to run
 
    pnpm experiment:infer1
    pnpm experiment:infer1-direct
    pnpm experiment:infer2
    pnpm experiment:infer3
    pnpm experiment:infer4
 
### Read more
 
- https://github.com/microsoft/TypeScript/wiki/Writing-a-Language-Service-Plugin
- https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API
- https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API#using-the-type-checker
- https://github.com/Microsoft/TypeScript/wiki/Using-the-Language-Service-API
- https://stackoverflow.com/questions/63944135/typescript-compiler-api-how-to-get-type-with-resolved-type-arguments
- https://stackoverflow.com/questions/48886508/typechecker-api-how-do-i-find-inferred-type-arguments-to-a-function
- https://blog.logrocket.com/using-typescript-transforms-to-enrich-runtime-code-3fd2863221ed/
- https://github.com/itsdouges/typescript-transformer-handbook#transforms

### Interesting libraries

- https://github.com/GoogleFeud/ts-macros/
- https://ts-morph.com