talib-web v0.1.3

talib-web

TA-Lib, the technical analysis library written in C, ported to WebAssembly. Plus a nice API wrapper layer, typescript support and docs.

talib-web is based on talib.js,and make some changes to using it easier.

Installation

npm install --save talib-web

Usage

Normal

const talib = require("talib-web");

const inReal = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

async function main() {
  await init(/* optionally pass in .wasm file path here */);
  console.log(talib.ADD({ inReal0: inReal, inReal1: inReal }));
}

main();

Or:

import { init, ADD } from "talib-web";

async function main() {
  await init(/* optionally pass in .wasm file path here */);
  const inReal = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
  console.log("talib.ADD result:", ADD({ inReal0: inReal, inReal1: inReal }));
}

main();

output:

{ output: [
    2,  4,  6,  8, 10,
  12, 14, 16, 18, 20
] }

Use TAFuncs object

import { init,  TAFuncs } from "talib-web";

async function main() {
  await init(/* optionally pass in .wasm file path here */);
  const inReal = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
  console.log("TAFuncs.ADD result:", TAFuncs.ADD({ inReal0: inReal, inReal1: inReal }));

  //you can call other talib function easily without import,just like TAFuncs.MA()
}

Documentation

Visit https://ancheGT.github.io/talib-web/

Docs are generated using typedoc and hosted on GitHub Pages.

Develop

develop environment:

• OS: CentOS 7
• node: v14.15.5
• NPM: 6.14.11
• emscripten: 2.0.34
• tsc: 4.5.2

dependencies installation

• emscripten

• npm

  	```bash
  	npm install typescript -g
  	npm install
  	```

build:

make clean # clean temp
make

branchs

• master-hackape: original repo of talib.js

• master-new: current repo

• gh-pages: github pages, after make branch master-new, copy the docs dir to this branch.It's relies on the setting of GitHub Pages -> Source

Troubleshooting:

• in terminal, run make got: error while loading shared libraries: libatomic.so.1: cannot open shared obj - run command: yum -y install libatomic

• in browser console,got:

  	```
  	index.esm.js?80e5:561 
  		
  		Uncaught (in promise) RuntimeError: abort(CompileError: WebAssembly.instantiate(): expected magic word 00 61 73 6d, found 3c 21 44 4f @+0). Build with -s ASSERTIONS=1 for more info.
  		at abort (webpack-internal:///./node_modules/talib-web/lib/index.esm.js:886)
  		at eval (webpack-internal:///./node_modules/talib-web/lib/index.esm.js:962)
  	index.esm.js?80e5:2146 
  		
  		Uncaught (in promise) Error: TA-Lib WASM runtime init fail.
  	Error: 
  	abort(CompileError: WebAssembly.instantiate(): expected magic word 00 61 73 6d, found 3c 21 44 4f @+0). Build with -s ASSERTIONS=1 for more info.
  		at eval (webpack-internal:///./node_modules/talib-web/lib/index.esm.js:2471)
  	```
  	- Pass a URL param to init,like this: `await init("https://unpkg.com/talib-web@0.1.2/lib/talib.wasm");`
  
  	- You can host this file yourself if you like. It’s just a static asset, like a picture, nothing magical.
  
  	- If you decide to host it, 2 things to check:

  - Make sure the URL is accessible from your origin, e.g. double check CORS config if involved. - Make sure the MIME type is correctly set to application/wasm.